Pub Date : 2023-10-25DOI: 10.1080/02286203.2023.2269836
Erol Can, Ugur Kilic
ABSTRACTThe Transformer Rectifier Unit (TRU) in aircraft is DC power supplies. Three-phase AC power supplies are available as long as they work. DC power distribution, on the other hand, provides DC power directly to all DC users, providing input power to the emergency AC distribution system so that the static inverter can generate AC power. To the voltages produced by TRUs to be less oscillating and of higher quality, multi-pulse ones are studied and recommended for aircraft systems. In this study, Zener diode filtered multi-pulse rectifier, which can further reduce the oscillations in the output voltage, is recommended for aircraft. Three-phase half-wave rectifier design and analysis are presented to better demonstrate the effectiveness of Zener diode regulation in multi-pulse TRUs. First, the parts of the power system, which includes the rectifier circuit of a two-engine aircraft and fed by this rectifier, are given. The circuit structure and working order of the rectifier are given with mathematical explanations. In the application phase, low oscillating output voltages and currents are obtained by creating currents and voltages on the load for different Zener voltages. Conventional rectifiers and the proposed rectifier are tested on the same loads, and comparisons are done.KEYWORDS: TRUZener diode regulationtwo-engine aircraft Disclosure statementThe author does not have any competing financial, professional, or personal interests from other parties.Additional informationNotes on contributorsErol CanErol Can received his master’s degree in 2010 from the Department of Electrical Engineering at Karadeniz Technical University. He received his Ph.D. from the Department of Electric at Gazi University in 2016. He still works at Erzincan Binali Yıldırım University as Assoc. Prof. Dr.Ugur KilicUgur Kilic received his master’s degree in 2016 from the Department of Electrical and Electronics Engineering at Fırat University. He received his Ph.D. from the Department of Avionics at Eskisehir Technical University in 2021. He still works at Erzincan Binali Yıldırım University as Asst. Prof. Dr.
{"title":"Ac-Dc multi pulse converter for dc power distribution system in aircraft","authors":"Erol Can, Ugur Kilic","doi":"10.1080/02286203.2023.2269836","DOIUrl":"https://doi.org/10.1080/02286203.2023.2269836","url":null,"abstract":"ABSTRACTThe Transformer Rectifier Unit (TRU) in aircraft is DC power supplies. Three-phase AC power supplies are available as long as they work. DC power distribution, on the other hand, provides DC power directly to all DC users, providing input power to the emergency AC distribution system so that the static inverter can generate AC power. To the voltages produced by TRUs to be less oscillating and of higher quality, multi-pulse ones are studied and recommended for aircraft systems. In this study, Zener diode filtered multi-pulse rectifier, which can further reduce the oscillations in the output voltage, is recommended for aircraft. Three-phase half-wave rectifier design and analysis are presented to better demonstrate the effectiveness of Zener diode regulation in multi-pulse TRUs. First, the parts of the power system, which includes the rectifier circuit of a two-engine aircraft and fed by this rectifier, are given. The circuit structure and working order of the rectifier are given with mathematical explanations. In the application phase, low oscillating output voltages and currents are obtained by creating currents and voltages on the load for different Zener voltages. Conventional rectifiers and the proposed rectifier are tested on the same loads, and comparisons are done.KEYWORDS: TRUZener diode regulationtwo-engine aircraft Disclosure statementThe author does not have any competing financial, professional, or personal interests from other parties.Additional informationNotes on contributorsErol CanErol Can received his master’s degree in 2010 from the Department of Electrical Engineering at Karadeniz Technical University. He received his Ph.D. from the Department of Electric at Gazi University in 2016. He still works at Erzincan Binali Yıldırım University as Assoc. Prof. Dr.Ugur KilicUgur Kilic received his master’s degree in 2016 from the Department of Electrical and Electronics Engineering at Fırat University. He received his Ph.D. from the Department of Avionics at Eskisehir Technical University in 2021. He still works at Erzincan Binali Yıldırım University as Asst. Prof. Dr.","PeriodicalId":36017,"journal":{"name":"INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION","volume":"56 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134974077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-24DOI: 10.1080/02286203.2023.2265531
Yolanda Álvarez-Pérez, Ernesto López-Mellado
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Pub Date : 2023-10-23DOI: 10.1080/02286203.2023.2270884
Abdullah Dawar, Hamid Khan, Saeed Islam, Waris Khan
ABSTRACTThis paper presents the extension of Improved Residual Power Series Method (IRPSM) towards the system of ordinary differential equations (ODEs). The present system of ODEs is based on the thin film flow over an inclined planar surface. The proposed system is highly nonlinear. Additionally, some embedded factors are taken into the flow analysis in order to investigate the impacts of these parameters on the flow profiles. The method is coded in MATHEMATICA 12.0 software. The results of the present analysis show that the IRPSM has a fast convergence. The impacts of embedded parameters have been successfully investigated and have comparable effects on the flow profiles. Comparison of the present results with the results present in the literature has confirmed the validity of IRPSM. The IRPSM is also applicable to the systems of both linear and highly nonlinear ordinary and partial differential equations.KEYWORDS: Thin film flowboundary value probleminclined planar surfaceIRPSM Nomenclature Symbol/Expression=Nameu,v,w=Velocity components ms−1x,y,z=Coordinates mΩ=Angular velocity rads−1T=Temperature KB0=Magnetic field strength Ω1/2 m−1 s−1/2kg1/2p=Pressure Paμ=Dynamic viscosity kgm−1s−1ρ=Density kgm−3ν=Kinematic viscosity m2 s−1k=Thermal conductivity Wm−1 K−1ρCp=Heat capacitance Jm−3 K−1σ=Electrical conductivity Ω−1 m−1W0=Spraying velocity ms−1α=Angle of inclination 0gˆ=Gravitational force m2 s−1L=Film thickness mδ=Normalized thickness factorM=Magnetic factorPr=Prandtl numberRex=Reynolds numberAbbreviations=ADM=Adomian decomposition methodVIM=Variational iteration methodHPM=Homotopy perturbation methodHAM=Homotopy analysis methodDTM=Differential transform methodOHAM=Optimal homotopy asymptotic methodLFRDTM=Local fractional reduced differential transformLFLVIM=Local fractional Laplace variational iteration methodKdV=Coupled Korteweg – De Vries equationHAM=Homotopy analysis methodOCM=Operational collocation methodFDM=Finite difference methodRPSM=Residual power series methodIRPSM=Improved residual power series methodIVPs=Initial value problemsBVPs=Boundary value problemsAcknowledgmentsThe authors express their cordial thanks to the respected Editor in chief and honorable reviewers for their valuable suggestions and comments to improve the presentation of this article.Disclosure statementThe authors declare that they have no known competing financial interest.Additional informationFundingNo funding was received for this work.Notes on contributorsAbdullah DawarAbdullah Dawar received his BS degree from Islamia College University, Peshawar, Pakistan and MS degree from Qurtuba University of Science and Information Technology, Peshawar, Pakistan. He is currently a PhD student at the Department of Mathematics, Abdul Wali Khan University, Mardan, Pakistan. He has published more than 80 research articles in well-reputed journals during his education career. His research proficiency includes magnetohydrodynamic, nanofluids, hybrid nanofluids, heat and mass
赛义德·伊斯兰(Saeed Islam)获得了中国著名大学(哈尔滨工业大学)的数学博士学位,表明了他对流体力学及其在生物数学中的应用的高等教育和专业的奉献精神。凭借扎实的数学基础,他在巴基斯坦伊斯兰堡COMSATS大学开始了教学生涯,在那里他磨练了自己的教学技能和向年轻人传授知识的热情。这标志着他成为学术界杰出人物的开始。在伊斯兰堡通信卫星公司任职后,赛义德·伊斯兰教授加入了阿卜杜勒·瓦利·汗大学(AWKUM),在那里他将在该机构的学术和研究领域留下不可磨灭的印记。作为一名数学家和教育家,他培养了40名博士和120多名硕士,这反映了他对培养和指导下一代数学学者的承诺。基于他的研究资历,乔治梅森大学已经提供了一个兼职教授的职位。赛义德·伊斯兰教授对研究的投入是非常了不起的。他发表了500篇令人印象深刻的研究论文,影响因子超过1000,被引用超过10200次(google scholar引用),6700次(Web of Science引文)和7000多次(Scopus引文),他不仅为数学的发展做出了重大贡献,而且在科学界留下了不可磨灭的印记。他的研究工作在国内和国际上都得到了认可和认可。赛义德·伊斯兰教授对数学和研究的贡献得到了各种荣誉和奖项的认可和庆祝。他的成就使他在2013年获得了著名的Quaid-E-Azam金质奖章,这证明了他在该领域的非凡奉献精神和杰出成就。巴基斯坦科技部分别于2009年、2010年、2011年、2014年授予他科研生产力奖。赛义德·伊斯兰教授工作的影响已经超越了巴基斯坦的国界。他被科学网络评为巴基斯坦第8位,是巴基斯坦顶尖的院士之一。此外,2020年全球排名前2%的科学家进一步凸显了他的研究贡献得到了国际认可。教授Dr. Saeed Islam对研究的投入不仅体现在他的出版记录上,还体现在他作为PI和Co-PI参与的研究项目上。他以PI和Co-PI的身份完成了5个研究项目,为推进数学前沿和解决现实问题做出了积极贡献。他在研究上的奉献精神和生产力得到了科技部的认可,并多次获得科技部颁发的生产力奖。除了卓越的学术及研究成就外,赛义德教授亦表现出卓越的领导才能。在他的职业生涯中,他曾担任多个行政职位,包括2012年至2020年担任数学系主席,2013年担任注册主任,2012年担任研究、创新和商业化办公室主任,以及考试总监。目前,他担任Abdul Wali Khan University Mardan的物理与数值科学系主任和学术与研究主任。教授博士赛义德伊斯兰的奉献精神,他的学术和他的大学的发展是显而易见的,通过他参与各种法定机构和委员会。他一直是参议院、辛迪加、遴选委员会、学术委员会、隶属委员会、ASRB(学术人员审查委员会)、研究委员会和其他相关机构的积极成员,为学术政策和指导方针的发展和制定做出了贡献。教授博士赛义德伊斯兰在学术界和数学的旅程是一个鼓舞人心的有抱负的研究人员和教育工作者。凭借杰出的学术背景、大量的出版物、众多学者的指导和强大的行政影响力,他在巴基斯坦的学术和研究领域留下了不可磨灭的印记。他对数学领域的贡献不仅为他赢得了国内和国际的认可,而且还推动了这一学科的知识前沿。他致力于研究、教学和行政工作,在塑造巴基斯坦教育的未来方面发挥了至关重要的作用。赛义德·伊斯兰教授的成就证明了教育和研究的变革力量,激励着后代。他在巴基斯坦伊斯兰堡Quaid-e-Azam大学获得硕士学位,在巴基斯坦KP阿伯塔巴德COMSATS大学获得硕士学位,在巴基斯坦白沙瓦伊斯兰学院大学获得博士学位。
{"title":"The improved residual power series method for a system of differential equations: a new semi-numerical method","authors":"Abdullah Dawar, Hamid Khan, Saeed Islam, Waris Khan","doi":"10.1080/02286203.2023.2270884","DOIUrl":"https://doi.org/10.1080/02286203.2023.2270884","url":null,"abstract":"ABSTRACTThis paper presents the extension of Improved Residual Power Series Method (IRPSM) towards the system of ordinary differential equations (ODEs). The present system of ODEs is based on the thin film flow over an inclined planar surface. The proposed system is highly nonlinear. Additionally, some embedded factors are taken into the flow analysis in order to investigate the impacts of these parameters on the flow profiles. The method is coded in MATHEMATICA 12.0 software. The results of the present analysis show that the IRPSM has a fast convergence. The impacts of embedded parameters have been successfully investigated and have comparable effects on the flow profiles. Comparison of the present results with the results present in the literature has confirmed the validity of IRPSM. The IRPSM is also applicable to the systems of both linear and highly nonlinear ordinary and partial differential equations.KEYWORDS: Thin film flowboundary value probleminclined planar surfaceIRPSM Nomenclature Symbol/Expression=Nameu,v,w=Velocity components ms−1x,y,z=Coordinates mΩ=Angular velocity rads−1T=Temperature KB0=Magnetic field strength Ω1/2 m−1 s−1/2kg1/2p=Pressure Paμ=Dynamic viscosity kgm−1s−1ρ=Density kgm−3ν=Kinematic viscosity m2 s−1k=Thermal conductivity Wm−1 K−1ρCp=Heat capacitance Jm−3 K−1σ=Electrical conductivity Ω−1 m−1W0=Spraying velocity ms−1α=Angle of inclination 0gˆ=Gravitational force m2 s−1L=Film thickness mδ=Normalized thickness factorM=Magnetic factorPr=Prandtl numberRex=Reynolds numberAbbreviations=ADM=Adomian decomposition methodVIM=Variational iteration methodHPM=Homotopy perturbation methodHAM=Homotopy analysis methodDTM=Differential transform methodOHAM=Optimal homotopy asymptotic methodLFRDTM=Local fractional reduced differential transformLFLVIM=Local fractional Laplace variational iteration methodKdV=Coupled Korteweg – De Vries equationHAM=Homotopy analysis methodOCM=Operational collocation methodFDM=Finite difference methodRPSM=Residual power series methodIRPSM=Improved residual power series methodIVPs=Initial value problemsBVPs=Boundary value problemsAcknowledgmentsThe authors express their cordial thanks to the respected Editor in chief and honorable reviewers for their valuable suggestions and comments to improve the presentation of this article.Disclosure statementThe authors declare that they have no known competing financial interest.Additional informationFundingNo funding was received for this work.Notes on contributorsAbdullah DawarAbdullah Dawar received his BS degree from Islamia College University, Peshawar, Pakistan and MS degree from Qurtuba University of Science and Information Technology, Peshawar, Pakistan. He is currently a PhD student at the Department of Mathematics, Abdul Wali Khan University, Mardan, Pakistan. He has published more than 80 research articles in well-reputed journals during his education career. His research proficiency includes magnetohydrodynamic, nanofluids, hybrid nanofluids, heat and mass","PeriodicalId":36017,"journal":{"name":"INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION","volume":"28 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135412870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-23DOI: 10.1080/02286203.2023.2274258
Issam Dagher
ABSTRACTThe objective of this paper is to extract directly local important region descriptors using image super-pixels and fuzzy numbers. Previous works are based on extracting important feature points like corners in an image then region descriptors are formed around these features. Our novel contribution is to consider directly the most discriminative super-pixels as region descriptors. First, each super-pixel is considered as a fuzzy number. Then the alpha-cut which best represents the fuzzy number is obtained. Finally, according to these alpha-cuts and the cardinality of each fuzzy number the region descriptors are formed. Matching is done according to distances between fuzzy numbers. The Palm-print recognition problem was chosen to show the effectiveness of this approach.KEYWORDS: Regions descriptorssuper-pixelsfuzzy number Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsIssam DagherIssam Dagher finished his MS in electrical engineering degree in 1994 from Florida International University, Miami, USA. He finished his Ph.D. in 1997 at the University of Central Florida, Orlando USA. He is now a full professor at the University of Balamand, Lebanon. His areas of interest are pattern recognition, neural networks, artificial intelligence, and computer vision. He published many papers on these topics.
摘要本文的目的是利用图像超像素和模糊数直接提取局部重要区域描述符。以前的工作是基于提取图像中的角等重要特征点,然后围绕这些特征形成区域描述子。我们的新贡献是直接考虑最具区别性的超像素作为区域描述符。首先,每个超像素被认为是一个模糊数。然后得到最能代表模糊数的alpha-cut。最后,根据这些alpha-cuts和每个模糊数的基数形成区域描述符。根据模糊数之间的距离进行匹配。以掌纹识别问题为例,验证了该方法的有效性。关键词:区域描述符超像素模糊数披露声明作者未报告潜在利益冲突。issam Dagher于1994年在美国迈阿密的佛罗里达国际大学(Florida International University)获得电子工程硕士学位。1997年在美国奥兰多中佛罗里达大学获得博士学位。他现在是黎巴嫩巴拉曼大学的正教授。他的研究领域包括模式识别、神经网络、人工智能和计算机视觉。他就这些题目发表了许多论文。
{"title":"Feature descriptors using super-pixels as fuzzy numbers","authors":"Issam Dagher","doi":"10.1080/02286203.2023.2274258","DOIUrl":"https://doi.org/10.1080/02286203.2023.2274258","url":null,"abstract":"ABSTRACTThe objective of this paper is to extract directly local important region descriptors using image super-pixels and fuzzy numbers. Previous works are based on extracting important feature points like corners in an image then region descriptors are formed around these features. Our novel contribution is to consider directly the most discriminative super-pixels as region descriptors. First, each super-pixel is considered as a fuzzy number. Then the alpha-cut which best represents the fuzzy number is obtained. Finally, according to these alpha-cuts and the cardinality of each fuzzy number the region descriptors are formed. Matching is done according to distances between fuzzy numbers. The Palm-print recognition problem was chosen to show the effectiveness of this approach.KEYWORDS: Regions descriptorssuper-pixelsfuzzy number Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsIssam DagherIssam Dagher finished his MS in electrical engineering degree in 1994 from Florida International University, Miami, USA. He finished his Ph.D. in 1997 at the University of Central Florida, Orlando USA. He is now a full professor at the University of Balamand, Lebanon. His areas of interest are pattern recognition, neural networks, artificial intelligence, and computer vision. He published many papers on these topics.","PeriodicalId":36017,"journal":{"name":"INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION","volume":"27 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135413752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-20DOI: 10.1080/02286203.2023.2265524
Mojeed T. Akolade, Tayyaba Akhtar, Mohamed M. Awad, Yusuf O. Tijani, Adeshina T. Adeosun
ABSTRACTThe current study investigates the weakly hydromagnetic and bioconvection nanofluid flow of Williamson fluid, which conveys gyrotactic microorganisms, over a three-dimensional Riga surface. The primary objective is to stabilize biological, mechanical, and thermal systems through the introduction of exponentially decaying rheology in both the momentum and energy equations, known as the electro-magneto-hydrodynamic actuator (EMHD). As such, the working fluid is assumed to be dissipative, with significant consideration given to the magnetic Reynolds number and a higher-order reaction rate. To simplify the phenomenon of suspended nanoparticles’ bioconvection, an appropriate similarity transformation is applied, converting the system of partial differential equations (PDEs) into systems of ordinary differential equations (ODEs). To analyze the governing flow parameters, the numerical approach, Galerkin Weighted Residual Method (GWRM), is employed. The results are presented through tables and graphs, providing valuable insights. The findings of the study highlight that Hartmann number improves the weak movement of the Williamson fluid, thermophoresis number positively affects all flow distributions. Moreover, the temperature field is influenced by Brownian motion, leading to inflation, while the concentration field experiences a decrease due to a lower number of fluid particles available for reaction. Furthermore, higher buoyancy forces indicate significant fluid movement, resulting in a reduction in the Williamson fluid chemical reaction rate.KEYWORDS: Gyrotactic microorganismsWilliamson fluidGalerkin methodNanoscienceEMHDRiga plate Nomenclature j0=current density [A/L2]M0=surface magnetic property [Wb/L2]μ=variable fluid viscosity [kgL−1s−1]C=fluid concentration [mol.]ρ=fluid density [Kgm−3]ν=kinematic viscosity [L2/s]β4=material constant [-]β1=viscosity parameterNt=Thermophoresis number [-]Sc=Schmidt number [-]K=Williamson fluid parameter [-]Gn=Gyrotatic Grashof number [-]Ec=Local Eckert number [-]λ=chemical reaction parameter [-]Tw=temperature density [K]Cw=concentration density [mol.L−3]C∞=free stream concentration [mol.L−3]w=velocity component in the z− [Ls−1]u=velocity component in the x− direction [LS−1]Kr=rate of reaction [S−1]ρf=density of the fluid [Kg/L3]r0=diameter of the magnets [L]Do=mass diffusivity[L2/s]T=fluid temperature [K]Cp=specific heat capacity [J/kg.K]Ha=modified Hartman number [-]β2=thermal conductivity [WL−1K−1]Nb=Brownian motion [-]β5=stretching ratio [-]Pr=Prandtl number [-]Gr=thermal Grashof number [-]χ=bioconvection constant [-]Le=Lewis number [-]Pe=Peclet number [-]Nw=motile density [mol.Kg−1]T∞=free stream temperature [K]N∞=free Stream motile microorganisms [mol.Kg−1]v=velocity component in the y− direction [LS−1]x,y,z=cartesian coordinate system [L]AcknowledgmentsThe authors appreciates and acknowledge the reviewers for their constructive comments. Thanks you for your time.Disclosure statementNo potential confl
摘要本文研究了携带回旋微生物的Williamson流体在三维Riga表面上的弱磁流体和生物对流纳米流体流动。主要目标是通过在动量和能量方程中引入指数衰减流变学来稳定生物、机械和热系统,即电磁流体动力致动器(EMHD)。因此,假定工作流体是耗散的,并充分考虑了磁雷诺数和高阶反应速率。为了简化悬浮纳米颗粒的生物对流现象,采用适当的相似变换,将偏微分方程组(PDEs)转化为常微分方程组(ode)。采用数值方法Galerkin加权残差法(GWRM)对控制流参数进行分析。结果通过表格和图表呈现,提供有价值的见解。研究结果表明,Hartmann数改善了Williamson流体的弱运动,热泳数对所有流动分布都有积极影响。此外,温度场受到布朗运动的影响,导致膨胀,而浓度场由于可用于反应的流体颗粒数量减少而减小。此外,较高的浮力表明显著的流体运动,导致Williamson流体化学反应速率降低。关键词:j0=电流密度[A/L2]M0=表面磁性[Wb/L2]μ=可变流体粘度[kgL−1s−1]C=流体浓度[mol.]ρ=流体密度[Kgm−3]ν=运动粘度[L2/s]β4=物质常数[-]β1=粘度参数nt =热电泳数[-]Sc=施密特数[-]K=威廉威廉森流体参数[-]Gn=旋转格拉什数[-]Ec=局部埃克特数[-]λ=化学反应参数[-]Tw=温度密度[K]Cw=浓度密度[mol.L - 3]C∞=自由流浓度[mol.L - 3]w= z−[Ls−1]方向上的速度分量u= x−方向上的速度分量[Ls−1]Kr=反应速率[S−1]ρf=流体密度[Kg/L3]r0=磁体直径[L]Do=质量扩散系数[L2/ S]T=流体温度[K]Cp=比热容[J/ Kg]K]Ha=修正哈特曼数[-]β2=热导率[WL−1K−1]Nb=布朗运动[-]β5=拉伸比[-]Pr=普朗特数[-]Gr=热格拉什夫数[-]χ=生物对流常数[-]Le=刘易斯数[-]Pe=佩利特数[-]Nw=运动密度[mol.Kg−1]T∞=自由流温度[K]N∞=自由流运动微生物[mol.Kg−1]v= y方向的速度分量[LS−1]x,y,z=笛卡尔坐标系[L]感谢并感谢评议者的支持建设性的评论。谢谢你的宝贵时间。披露声明作者未报告潜在的利益冲突。作者简介:smojeed T. Akolade demojeed T. Akolade是尼日利亚伊洛林市伊洛林大学数学系的博士生,也是尼日利亚Kwara州奥科市Thomas Adewumi大学数学与计算科学系的助理讲师。他的研究兴趣包括流体力学、热力学分析、挤压流动、非牛顿流体流动、敏感性分析、流体流动问题的数值和统计分析,并撰写和合作撰写了许多期刊文章。Tayyaba Akhtar来自巴基斯坦旁遮普省南卡纳Sahib地区的历史小镇Sangla Hill。自2022年至今,她一直在数学系担任客座讲师。她毕业于巴基斯坦费萨拉巴德著名的政府学院大学。主要研究方向为数值模拟、热流和质量流、辐射、多孔介质、MHD流、微生物、纳米流体和微分方程。她参加了许多国内/国际会议/研讨会。Mohamed M. awad教授Mohamed M. Awad博士是埃及曼苏拉大学工程学院机械动力工程系的副教授。他也是2005年和2006年ASME国际石油技术研究所(IPTI)奖的获得者。他于2017年3月29日至4月2日在瑞士日内瓦举行的第45届国际发明展上获得银奖。目前,他是非洲和澳大利亚的区域编辑,土耳其耶尔迪兹技术大学出版社《热工程杂志》的编辑委员会成员,《国际石油、天然气和煤炭工程杂志》的编辑委员会成员和国际石油技术杂志的编辑委员会成员。他获得了博士学位。
{"title":"Bioconvection analysis of EMHD and dissipative Williamson nanofluid over a three dimensional Riga plate with Joule heating effect","authors":"Mojeed T. Akolade, Tayyaba Akhtar, Mohamed M. Awad, Yusuf O. Tijani, Adeshina T. Adeosun","doi":"10.1080/02286203.2023.2265524","DOIUrl":"https://doi.org/10.1080/02286203.2023.2265524","url":null,"abstract":"ABSTRACTThe current study investigates the weakly hydromagnetic and bioconvection nanofluid flow of Williamson fluid, which conveys gyrotactic microorganisms, over a three-dimensional Riga surface. The primary objective is to stabilize biological, mechanical, and thermal systems through the introduction of exponentially decaying rheology in both the momentum and energy equations, known as the electro-magneto-hydrodynamic actuator (EMHD). As such, the working fluid is assumed to be dissipative, with significant consideration given to the magnetic Reynolds number and a higher-order reaction rate. To simplify the phenomenon of suspended nanoparticles’ bioconvection, an appropriate similarity transformation is applied, converting the system of partial differential equations (PDEs) into systems of ordinary differential equations (ODEs). To analyze the governing flow parameters, the numerical approach, Galerkin Weighted Residual Method (GWRM), is employed. The results are presented through tables and graphs, providing valuable insights. The findings of the study highlight that Hartmann number improves the weak movement of the Williamson fluid, thermophoresis number positively affects all flow distributions. Moreover, the temperature field is influenced by Brownian motion, leading to inflation, while the concentration field experiences a decrease due to a lower number of fluid particles available for reaction. Furthermore, higher buoyancy forces indicate significant fluid movement, resulting in a reduction in the Williamson fluid chemical reaction rate.KEYWORDS: Gyrotactic microorganismsWilliamson fluidGalerkin methodNanoscienceEMHDRiga plate Nomenclature j0=current density [A/L2]M0=surface magnetic property [Wb/L2]μ=variable fluid viscosity [kgL−1s−1]C=fluid concentration [mol.]ρ=fluid density [Kgm−3]ν=kinematic viscosity [L2/s]β4=material constant [-]β1=viscosity parameterNt=Thermophoresis number [-]Sc=Schmidt number [-]K=Williamson fluid parameter [-]Gn=Gyrotatic Grashof number [-]Ec=Local Eckert number [-]λ=chemical reaction parameter [-]Tw=temperature density [K]Cw=concentration density [mol.L−3]C∞=free stream concentration [mol.L−3]w=velocity component in the z− [Ls−1]u=velocity component in the x− direction [LS−1]Kr=rate of reaction [S−1]ρf=density of the fluid [Kg/L3]r0=diameter of the magnets [L]Do=mass diffusivity[L2/s]T=fluid temperature [K]Cp=specific heat capacity [J/kg.K]Ha=modified Hartman number [-]β2=thermal conductivity [WL−1K−1]Nb=Brownian motion [-]β5=stretching ratio [-]Pr=Prandtl number [-]Gr=thermal Grashof number [-]χ=bioconvection constant [-]Le=Lewis number [-]Pe=Peclet number [-]Nw=motile density [mol.Kg−1]T∞=free stream temperature [K]N∞=free Stream motile microorganisms [mol.Kg−1]v=velocity component in the y− direction [LS−1]x,y,z=cartesian coordinate system [L]AcknowledgmentsThe authors appreciates and acknowledge the reviewers for their constructive comments. Thanks you for your time.Disclosure statementNo potential confl","PeriodicalId":36017,"journal":{"name":"INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION","volume":"5 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135567548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-20DOI: 10.1080/02286203.2023.2270757
Karim Fathi Sayeh, Salah Tamalouzt, Younes Sahri
ABSTRACTIn this paper, a novel direct power control technique founded on fuzzy logic controller (FLC-DPC) is selected to master and control the DFIG for wind energy conversion system (WECS). The fuzzy logic controller replaces both hysteresis regulators and the switching table in the proposed strategy. Seeking to enhance the control and overcome the defects associated with the conventional DPC (C-DPC) technique, this control depends on the errors of both active and reactive powers. The suitable rotor voltage vector for the inverter is obtained by FLC-DPC. The proposed control strategy is applied to the WT-DFIG system, in order to study its effectiveness. To reflect a real WECS operation, this study considers the wind’s random behaviour in successive and continuous ways throughout all WT-DFIG operating modes. Also, it takes into consideration all compensated local reactive power modes. The studied system and the proposed control were tested under MATLAB/Simulink environment. The obtained results showed the high effectiveness of the proposed control in terms of response time, robustness and ease. Consequently, C-DPC’s drawbacks are eliminated, and the ripples in compensated local reactive and produced active powers are reduced. Additionally, the total harmonic distortions (THDs) of injected currents are reduced, which improves their quality.KEYWORDS: Renewable energywind power conversion systemDFIGDPCfuzzy logic control Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsKarim Fathi SayehKarim Fathi Sayeh is currently a Ph.D. candidate in Renewable Energy Systems Control at the University of Bejaia, Algeria. He has a Master's in Electromechanical Engineering from the University of Djelfa, Algeria in 2021. His areas of research interest encompass Artificial Intelligence, Hybrid Renewable Energy Systems, Non-linear and Intelligent Control, as well as Energy Management.Salah TamalouztSalah Tamalouzt was born in Bejaia (Algeria). He received an engineering diploma in Electrical Engineering, specializing in Electrical Networks, and a Magister in Electrical Engineering, specializing in Power Electronics, from the University of Bejaia and the University of Batna, respectively. In 2017, he obtained his PhD diploma from the University of Bejaia. Since 2019, he has been a Senior Lecturer Class A and a Senior Researcher in the Electrical Engineering Department at the University. His research interests include Power Electronics, Modeling, Control and Management of Renewable Energy and Hybrid Energy Systems (such as Photovoltaic Systems, Wind Systems, Fuel Cells, Hydrogen), Hybrid Storage, Energy Management for Multi-Source Renewable Energy Systems, Supervision and Optimization of Micro-Grids, as well as Control and Optimization by Artificial Intelligence of Renewable Energy Systems, with a focus on Modeling and Control of Electric Machines and Drives.Younes SahriYounes Sahri was born in
{"title":"Improvement of power quality in WT-DFIG systems using novel direct power control based on fuzzy logic control under randomness conditions","authors":"Karim Fathi Sayeh, Salah Tamalouzt, Younes Sahri","doi":"10.1080/02286203.2023.2270757","DOIUrl":"https://doi.org/10.1080/02286203.2023.2270757","url":null,"abstract":"ABSTRACTIn this paper, a novel direct power control technique founded on fuzzy logic controller (FLC-DPC) is selected to master and control the DFIG for wind energy conversion system (WECS). The fuzzy logic controller replaces both hysteresis regulators and the switching table in the proposed strategy. Seeking to enhance the control and overcome the defects associated with the conventional DPC (C-DPC) technique, this control depends on the errors of both active and reactive powers. The suitable rotor voltage vector for the inverter is obtained by FLC-DPC. The proposed control strategy is applied to the WT-DFIG system, in order to study its effectiveness. To reflect a real WECS operation, this study considers the wind’s random behaviour in successive and continuous ways throughout all WT-DFIG operating modes. Also, it takes into consideration all compensated local reactive power modes. The studied system and the proposed control were tested under MATLAB/Simulink environment. The obtained results showed the high effectiveness of the proposed control in terms of response time, robustness and ease. Consequently, C-DPC’s drawbacks are eliminated, and the ripples in compensated local reactive and produced active powers are reduced. Additionally, the total harmonic distortions (THDs) of injected currents are reduced, which improves their quality.KEYWORDS: Renewable energywind power conversion systemDFIGDPCfuzzy logic control Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsKarim Fathi SayehKarim Fathi Sayeh is currently a Ph.D. candidate in Renewable Energy Systems Control at the University of Bejaia, Algeria. He has a Master's in Electromechanical Engineering from the University of Djelfa, Algeria in 2021. His areas of research interest encompass Artificial Intelligence, Hybrid Renewable Energy Systems, Non-linear and Intelligent Control, as well as Energy Management.Salah TamalouztSalah Tamalouzt was born in Bejaia (Algeria). He received an engineering diploma in Electrical Engineering, specializing in Electrical Networks, and a Magister in Electrical Engineering, specializing in Power Electronics, from the University of Bejaia and the University of Batna, respectively. In 2017, he obtained his PhD diploma from the University of Bejaia. Since 2019, he has been a Senior Lecturer Class A and a Senior Researcher in the Electrical Engineering Department at the University. His research interests include Power Electronics, Modeling, Control and Management of Renewable Energy and Hybrid Energy Systems (such as Photovoltaic Systems, Wind Systems, Fuel Cells, Hydrogen), Hybrid Storage, Energy Management for Multi-Source Renewable Energy Systems, Supervision and Optimization of Micro-Grids, as well as Control and Optimization by Artificial Intelligence of Renewable Energy Systems, with a focus on Modeling and Control of Electric Machines and Drives.Younes SahriYounes Sahri was born in","PeriodicalId":36017,"journal":{"name":"INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135617921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-15DOI: 10.1080/02286203.2023.2266798
N. Venkatesh, R. Srinivasa Raju, M. Anil Kumar, Ch. Vijayabhaskar
ABSTRACTThe objective of this work is to examine the distinctive features of heat and mass transfer in a 2-dimensional Maxwell fluid that is incompressible and contains electrically conducting nanoparticles. They are illustrated by using a stretched sheet with convective boundary conditions and a heat source/sink in the presence of thermal radiation and chemical interaction. Studies of hydromagnetic flow and heat transfer across a stretched sheet have lately attracted a great deal of attention as a result of its numerous industrial applications and a huge impact on a broad variety of manufacturing processes. Power plants, heat exchangers, MHD generators, aerodynamics, plastic sheet extrusion, condensation processes, and metal spinning are examples of these processes. The partial differential equations (PDEs) that govern the flow and the boundary conditions that correspond with them may be non-dimensionalized by using the appropriate similarity variables. The resulting transformed ordinary differential equations (ODEs) are solved using the Runge-Kutta-Fehlberg scheme of the fourth and fifth order. By assuming a value for the boundary condition, the shooting approach transforms the boundary value problem (BVP) into an initial value problem (IVP), which is subsequently solved using the RKF45 algorithm. Graphical representations of how such embedded thermo-physical parameters significantly impact the velocity, temperature, and concentration are assessed and shown. A comparison case study is made with previously published literature, and a great correlation between the results exists. The primary results of the research are that raising estimates of the chemical reaction parameter minimises the concentration distribution while increasing the thermal radiation parameter raises the temperature. As the quantity of thermophoresis rises, the thickness of the boundary layer increases, causing the surface temperature to rise, resulting in a temperature rise.KEYWORDS: Stretching sheetnanoparticlesthermal radiationMaxwell fluid Nomenclature Bi=Biot numberc=positive constantC=Concentration of the fluid molm−3Cw=Fluid concentration at the wall molm−3C∞=Fluid Concentration at infinity molm−3Cs=Concentration susceptibilityCp=Specific heat at constant pressure J.Kg−1.KCf=Skin frictionDB=Brownian diffusionDT=Coefficient of thermophoretic diffusionDM=Mass diffusivity m2.s−1f=Dimensionless velocity stream functionhf=Heat transfer coefficientk=Thermal conductivity ω.m−1.K−1k0=Maxwell fluid relaxation timeKT=Thermal-diffusion ratio parameterKr=Chemical reaction parameterLe=Lewis NumberNb=Brownian Motion ParameterNt=Thermophoresis parameterNr=Radiation ParameterNux=local Nusselt numberPr=Prandtl numberShx=local Sherwood numberT=Temperature of fluid near the plate KTw=Fluid temperature closer to the wallKT∞=fluid Temperature at infinity KTf=The temperature of hot fluidu=Dimensionless velocity along x-axism.s−1v=Dimensionless velocity along of y- axism.s−1x,y=Cartesian coo
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Pub Date : 2023-10-09DOI: 10.1080/02286203.2023.2265543
Hye-Jin Yoon, Yeeun Lee, Sun-Hong Kim, Eunae Kim, Hyung Ho Lee, Soonmin Jang
ABSTRACTThe Niemann-Pick C1-like 1 (NPC1L1) protein facilitates cholesterol absorption in the small intestine and mediates the absorption of other sterols, including vitamins E, vitamin K1, and coenzyme Q10 (CoQ10). Ezetimibe is a drug used to treat high blood cholesterol and lipid abnormalities. However, V55L/I1223N and non-conserved V55 mutations in humans and rats, respectively, have been linked to ezetimibe insensitivity. In this study, molecular modeling, which combines the molecular dynamics simulations with the molecular mechanics Poisson-Boltzmann surface area approach, was used to estimate the change in the binding free energy of the NPC1L1 N-terminal domain (NTD) owing to the V55L mutation, Further, free energy changes for the three sterols namely, vitamin E, vitamin K1, and CoQ10 were estimated. The current study found that the V55L mutation reduced the cholesterol to NPC1L1-NTD binding free energy, which compensates for the decreased cholesterol passage through the putative tunnel induced by the ezetimibe. Therefore, molecular modeling of the free energy changes owing to mutations can successfully provide insights into the intricate details of drug inhibitors.KEYWORDS: Molecular dynamics simulationmolecular dockingNiemann-pick type C (NPC) disease, cholesterol transport AcknowledgmentsThis work was supported by National Research Foundation of Korea (NRF) grants funded by the Korean government under Grant numbers 2021R1A2C1004388 to HYJ, 2022R1A2B5B02002529 and 2022R1A5A6000760 to LHH). This work was supported by the National Supercomputing Center with supercomputing resources, including technical support from KSC-2021-CRE-0253 and KSC-2022-CRE-0167 from HJY.Disclosure statementNo potential conflict of interest was reported by the authors.Author contributionsH.-J.Y., S.H.K., S.J., and H.H.L. conceived and designed the experiments. H. J. Y., E.K., and Y.L. performed the computations. All authors analyzed the data, compiled and edited the manuscript.Supplemental dataSupplemental data for this article can be accessed online at https://doi.org/10.1080/02286203.2023.2265543Additional informationFundingThe work was supported by the National Research Foundation of Korea [2022R1A2B5B02002529]; National Research Foundation of Korea [2022R1A5A6000760]; National Research Foundation of Korea [2021R1A2C1004388].Notes on contributorsHye-Jin YoonHye-Jin Yoon is a research professor. Her research area is structural biochemistry including biomolecular structure determination using X-ray crystallography.Yeeun LeeYeeun Lee is a Ph.D. candidate student after receiving a MS Degree in science. She is under the supervision of Professor S. Jang.Sun-Hong KimSun-Hong Kim is a Ph.D. candidate student under the guidance of Professor H. H. Lee.Eunae KimEunae Kim is a professor, who specializes in drug discovery and biomolecular simulation.Hyung Ho LeeHyung Ho Lee, an associate professor, specializes in membrane proteins, including receptors and channels, using X-r
Niemann-Pick C1-like 1 (NPC1L1)蛋白促进胆固醇在小肠中的吸收,并介导其他固醇的吸收,包括维生素E、维生素K1和辅酶Q10 (CoQ10)。依折麦布是一种用于治疗高胆固醇和血脂异常的药物。然而,人类和大鼠的V55L/I1223N和非保守的V55突变分别与依zetimibe不敏感有关。本研究采用分子动力学模拟和分子力学泊松-玻尔兹曼表面积方法相结合的分子模型,估计了V55L突变导致NPC1L1 n端结构域(NTD)结合自由能的变化,并估计了维生素E、维生素K1和辅酶q10三种甾醇的自由能变化。目前的研究发现,V55L突变将胆固醇降低到NPC1L1-NTD结合自由能,这补偿了依折替米贝诱导的假定通道中胆固醇的减少。因此,由于突变导致的自由能变化的分子模型可以成功地为药物抑制剂的复杂细节提供见解。关键词:分子动力学模拟分子对接尼曼-pick型C (NPC)病胆固醇转运感谢本工作由韩国国家研究基金会(NRF)资助,韩国政府资助项目号:2021R1A2C1004388 (HYJ), 2022R1A2B5B02002529和2022R1A5A6000760 (LHH)。本工作由国家超级计算中心提供超级计算资源支持,其中技术支持来自HJY的KSC-2021-CRE-0253和KSC-2022-CRE-0167。披露声明作者未报告潜在的利益冲突。作者contributionsH.-J.Y。, s.h.k., s.j.和H.H.L.构思并设计了这些实验。H. J. Y.、E.K.和Y. l .进行了计算。所有作者都对数据进行了分析,并对稿件进行了汇编和编辑。补充数据本文的补充数据可在https://doi.org/10.1080/02286203.2023.2265543Additional information网站上在线获取。韩国国家科学基金[2022R1A5A6000760];韩国国家研究基金[2021R1A2C1004388]。作者简介尹惠珍是一名研究教授。她的研究方向是结构生物化学,包括利用x射线晶体学测定生物分子结构。Yeeun Lee是获得理学硕士学位后的博士研究生。她的导师是S. Jang教授。KimSun-Hong Kim是一名博士研究生,指导老师是h.h. Lee教授。Eunae kimmeunae Kim是专门研究药物发现和生物分子模拟的教授。Hyung Ho Lee,副教授,专门研究膜蛋白,包括受体和通道,使用x射线晶体学和冷冻电镜。Soonmin Jang是一名教授。作为一名理论化学家,他的研究包括生物分子和纳米材料的计算机模拟。
{"title":"Exploring sterol transportation behavior of the Niemann-Pick C1-like 1 protein with V55L mutation: Sterol-NPC1L1 N-terminal binding energy estimation via molecular dynamics simulations","authors":"Hye-Jin Yoon, Yeeun Lee, Sun-Hong Kim, Eunae Kim, Hyung Ho Lee, Soonmin Jang","doi":"10.1080/02286203.2023.2265543","DOIUrl":"https://doi.org/10.1080/02286203.2023.2265543","url":null,"abstract":"ABSTRACTThe Niemann-Pick C1-like 1 (NPC1L1) protein facilitates cholesterol absorption in the small intestine and mediates the absorption of other sterols, including vitamins E, vitamin K1, and coenzyme Q10 (CoQ10). Ezetimibe is a drug used to treat high blood cholesterol and lipid abnormalities. However, V55L/I1223N and non-conserved V55 mutations in humans and rats, respectively, have been linked to ezetimibe insensitivity. In this study, molecular modeling, which combines the molecular dynamics simulations with the molecular mechanics Poisson-Boltzmann surface area approach, was used to estimate the change in the binding free energy of the NPC1L1 N-terminal domain (NTD) owing to the V55L mutation, Further, free energy changes for the three sterols namely, vitamin E, vitamin K1, and CoQ10 were estimated. The current study found that the V55L mutation reduced the cholesterol to NPC1L1-NTD binding free energy, which compensates for the decreased cholesterol passage through the putative tunnel induced by the ezetimibe. Therefore, molecular modeling of the free energy changes owing to mutations can successfully provide insights into the intricate details of drug inhibitors.KEYWORDS: Molecular dynamics simulationmolecular dockingNiemann-pick type C (NPC) disease, cholesterol transport AcknowledgmentsThis work was supported by National Research Foundation of Korea (NRF) grants funded by the Korean government under Grant numbers 2021R1A2C1004388 to HYJ, 2022R1A2B5B02002529 and 2022R1A5A6000760 to LHH). This work was supported by the National Supercomputing Center with supercomputing resources, including technical support from KSC-2021-CRE-0253 and KSC-2022-CRE-0167 from HJY.Disclosure statementNo potential conflict of interest was reported by the authors.Author contributionsH.-J.Y., S.H.K., S.J., and H.H.L. conceived and designed the experiments. H. J. Y., E.K., and Y.L. performed the computations. All authors analyzed the data, compiled and edited the manuscript.Supplemental dataSupplemental data for this article can be accessed online at https://doi.org/10.1080/02286203.2023.2265543Additional informationFundingThe work was supported by the National Research Foundation of Korea [2022R1A2B5B02002529]; National Research Foundation of Korea [2022R1A5A6000760]; National Research Foundation of Korea [2021R1A2C1004388].Notes on contributorsHye-Jin YoonHye-Jin Yoon is a research professor. Her research area is structural biochemistry including biomolecular structure determination using X-ray crystallography.Yeeun LeeYeeun Lee is a Ph.D. candidate student after receiving a MS Degree in science. She is under the supervision of Professor S. Jang.Sun-Hong KimSun-Hong Kim is a Ph.D. candidate student under the guidance of Professor H. H. Lee.Eunae KimEunae Kim is a professor, who specializes in drug discovery and biomolecular simulation.Hyung Ho LeeHyung Ho Lee, an associate professor, specializes in membrane proteins, including receptors and channels, using X-r","PeriodicalId":36017,"journal":{"name":"INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135093680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-06DOI: 10.1080/02286203.2023.2266792
C. Bheemudu, T. Ramakrishna Goud, Ravi Ragoju, Kiran Kumar Paidipati, Christophe Chesneau
ABSTRACTIn this paper, the linear and nonlinear instability of magnetoconvection in a Darcy-Benard setup saturated by a Maxwell fluid with chemical reactions is studied. The governing non-dimension equations are solved using the normal modes, and we obtain the expressions for steady and oscillatory thermal Rayleigh numbers. The effects of different physical parameters such as the Damkohler number (0<Da<20), Hartmann number (0<Ha<1), Solute Rayleigh number (0<RS<1000), relaxation parameter (0<λ<1), Magnetic Prandtl number (0<Pr<10), Lewis number (0<Le<100) on stationary and oscillatory critical thermal Rayleigh numbers are presented and described. Enhancing the values of the Solute Rayleigh number and Lewis number makes the system unstable. Also, the Hartmann number and Damkohler number have a contrasting effect on stationary and oscillatory convection. Enhancing the value of the relaxation parameter makes the system more stable. In order to study heat transport by convection, the well-known equation, the Landau-Ginzburg equation, is derived.KEYWORDS: Porous mediachemical reactionMaxwell fluidnonlinear stability analysis Nomenclature uˉ=Fluid velocity(m/s)uˉ,vˉ,wˉ=velocity componentsH‾=Magnetic field(A/m)Hx,Hy,Hz=Magnetic field componentsθˉ=Temperature(k)Cˉ=Concentration(moi/m3)t=Time(s)P=Pressure(N/m2)g=acceleration due gravity(m/s2)k=Thermal diffusivity(m2/s)κ=Permeability(H/m)d=Length(m)Dimensionless Parameters=A=Complex AmplitudeDa=Damkohler numberR=Rayleigh numberHa=Hartmann numberRS=Solute Rayleigh numberλ=relaxation parameterPr=Magnetic Prandtl numberLe=Lewis numberq=Wave numberNu=Nusselt numberGreek Symbols=α=Thermal expansion coefficientη=Magnetic diffusivity(m2/s)μ=Fluid viscosity(kg/ms)μe=Effective fluid Viscosity(kg/ms)μm=Magnetic Permeability(H/m)isin=Porosity(ml/min)ρ=Fluid density(kg/m3)ν=Kinematic viscosity(m2/s)AcknowledgmentsThe authors would like to thank the two anonymous referees and the associate editor for their insightful comments, which helped to significantly improve the paper.Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationNotes on contributorsC. BheemuduC. Bheemudu completed a graduation in Nizam degree college and MSc in Osmania University. Currently, he does PhD in Osmania University. He works on hydrodynamic stability.T. Ramakrishna GoudT. Ramakrishna Goud completed a MSc and PhD in Osmania University. Currently, he works as an assistant professor in department of mathematics, Shaifabad PG college. he investigates on boundary layer flow and hydrodynamic stability.Ravi RagojuDr. Ravi Ragoju is working as an Assistant Professor in Department of Applied Sciences, National Institute of Technology Goa, Goa, India. He published more than 35 articles in various reputed journals. He received MSc and PhD in Applied science from National Institute of Technology Warangal, Telangana, India. His research interests include convection, bifurcation analysis, linear and non-line
{"title":"Nonlinear magnetoconvection of a Maxwell fluid in a porous layer with chemical reaction","authors":"C. Bheemudu, T. Ramakrishna Goud, Ravi Ragoju, Kiran Kumar Paidipati, Christophe Chesneau","doi":"10.1080/02286203.2023.2266792","DOIUrl":"https://doi.org/10.1080/02286203.2023.2266792","url":null,"abstract":"ABSTRACTIn this paper, the linear and nonlinear instability of magnetoconvection in a Darcy-Benard setup saturated by a Maxwell fluid with chemical reactions is studied. The governing non-dimension equations are solved using the normal modes, and we obtain the expressions for steady and oscillatory thermal Rayleigh numbers. The effects of different physical parameters such as the Damkohler number (0<Da<20), Hartmann number (0<Ha<1), Solute Rayleigh number (0<RS<1000), relaxation parameter (0<λ<1), Magnetic Prandtl number (0<Pr<10), Lewis number (0<Le<100) on stationary and oscillatory critical thermal Rayleigh numbers are presented and described. Enhancing the values of the Solute Rayleigh number and Lewis number makes the system unstable. Also, the Hartmann number and Damkohler number have a contrasting effect on stationary and oscillatory convection. Enhancing the value of the relaxation parameter makes the system more stable. In order to study heat transport by convection, the well-known equation, the Landau-Ginzburg equation, is derived.KEYWORDS: Porous mediachemical reactionMaxwell fluidnonlinear stability analysis Nomenclature uˉ=Fluid velocity(m/s)uˉ,vˉ,wˉ=velocity componentsH‾=Magnetic field(A/m)Hx,Hy,Hz=Magnetic field componentsθˉ=Temperature(k)Cˉ=Concentration(moi/m3)t=Time(s)P=Pressure(N/m2)g=acceleration due gravity(m/s2)k=Thermal diffusivity(m2/s)κ=Permeability(H/m)d=Length(m)Dimensionless Parameters=A=Complex AmplitudeDa=Damkohler numberR=Rayleigh numberHa=Hartmann numberRS=Solute Rayleigh numberλ=relaxation parameterPr=Magnetic Prandtl numberLe=Lewis numberq=Wave numberNu=Nusselt numberGreek Symbols=α=Thermal expansion coefficientη=Magnetic diffusivity(m2/s)μ=Fluid viscosity(kg/ms)μe=Effective fluid Viscosity(kg/ms)μm=Magnetic Permeability(H/m)isin=Porosity(ml/min)ρ=Fluid density(kg/m3)ν=Kinematic viscosity(m2/s)AcknowledgmentsThe authors would like to thank the two anonymous referees and the associate editor for their insightful comments, which helped to significantly improve the paper.Disclosure statementNo potential conflict of interest was reported by the authors.Additional informationNotes on contributorsC. BheemuduC. Bheemudu completed a graduation in Nizam degree college and MSc in Osmania University. Currently, he does PhD in Osmania University. He works on hydrodynamic stability.T. Ramakrishna GoudT. Ramakrishna Goud completed a MSc and PhD in Osmania University. Currently, he works as an assistant professor in department of mathematics, Shaifabad PG college. he investigates on boundary layer flow and hydrodynamic stability.Ravi RagojuDr. Ravi Ragoju is working as an Assistant Professor in Department of Applied Sciences, National Institute of Technology Goa, Goa, India. He published more than 35 articles in various reputed journals. He received MSc and PhD in Applied science from National Institute of Technology Warangal, Telangana, India. His research interests include convection, bifurcation analysis, linear and non-line","PeriodicalId":36017,"journal":{"name":"INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134944111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}