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Stability effect of an axial magnetic field on fluid flow bifurcation between coaxial cylinders 轴向磁场对同轴圆柱间流体分岔的稳定性影响
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-09-25 DOI: 10.1142/s2047684121500238
H. Benhacine, B. Mahfoud, M. Salmi
Numerical simulations aim to investigate the bifurcation caused by swirling flow between two coaxial vertical cylinders, and the fluid layers produced by the thermal gradient. The stability of both bifurcation and fluid layers by an axial magnetic field is analyzed. The finite-volume method is used to solve the governing Navier–Stokes, temperature and potential equations. A conducting viscous fluid characterized by a small Prandtl number [Formula: see text] is placed in the gap between two coaxial cylinders. The combination of aspect ratio, [Formula: see text] and Reynolds number, [Formula: see text] for three annular gaps ([Formula: see text] and [Formula: see text]) is compared in terms of flow stability, and heat transfer rates. Without a magnetic field, the vortex breakdown takes place near the inner cylinder due to the increased pumping action of the Ekman boundary layer. Fluid layered structures are developed by the competition between buoyancy and viscous forces. The increase in the magnitude of the magnetic field retarders the onset of the oscillatory instability caused by the disappearance of the vortex breakdown and reduces the number of fluid layers. The limits in which a vortex breakdown bubble manifests and the limits of transition from the multiple fluid layers to the single fluid layer are established.
数值模拟的目的是研究两个同轴垂直圆柱之间的旋流引起的分岔,以及热梯度产生的流体层。分析了轴向磁场作用下分岔层和流体层的稳定性。用有限体积法求解了控制Navier-Stokes方程、温度方程和势方程。将具有小普朗特数特征的导电粘性流体[公式:见文本]置于两个同轴圆柱体之间的间隙中。对三个环形间隙([公式:见文]和[公式:见文])的展弦比、[公式:见文]和雷诺数[公式:见文]的组合进行流动稳定性和换热率的比较。在没有磁场的情况下,由于埃克曼边界层的泵送作用增加,涡流击穿发生在内筒附近。流体层状结构是由浮力和粘性力相互竞争而形成的。磁场强度的增加延缓了旋涡击穿消失引起的振荡不稳定性的发生,并减少了流体层数。建立了涡旋破裂泡的表现极限和由多流体层向单流体层过渡的极限。
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引用次数: 1
Stabilization of ferromagnetism in carbon doped Mgn−2Mn2On clusters 碳掺杂Mgn−2Mn2On簇的铁磁性稳定性
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-09-25 DOI: 10.1142/s2047684121500226
Rabin Acharya, Nirajan Pant, B. Rahaman, M. Yadav
We present density functional theory-based first principles study of magnetic properties of Mn-doped Mg[Formula: see text]Mn2On clusters. Mn-doped MgnOn clusters are found to exhibit antiferromagnetic order. We show that ferromagnetic state can be stabilized by codoping with carbon at oxygen site. Our study suggests that the holes created due to C doping are responsible for the stabilization of ferromagnetism.
我们提出了基于密度泛函理论的第一性原理研究Mn掺杂Mg的磁性[公式:见正文]Mn2On团簇。发现Mn掺杂的MgnOn团簇表现出反铁磁有序。我们证明了铁磁态可以通过在氧位与碳共掺杂来稳定。我们的研究表明,由于C掺杂而产生的空穴是铁磁性稳定的原因。
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引用次数: 0
Evaluation of grain growth exponent by Monte Carlo simulation in polycrystalline materials 用蒙特卡罗模拟评价多晶材料的晶粒生长指数
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-09-23 DOI: 10.1142/s204768412150024x
P. Rajendra, K. Phaneesh, C. Ramesha, Madeva Nagaral, V. Auradi
In metallurgy, the microstructure study is very important to evaluate the properties and performances of a material. The Monte Carlo method is applied in so many fields of Engineering Science and it is a very effective method to examine the topology of the computer-simulated structures and exactly resembles the static behavior of the atoms. The effective 2D simulation was performed to understand the grain growth kinetics, under the influence of second phase particles (impurities) is a base to control the microstructure. The matrix size and [Formula: see text]-states are optimized. The grain growth exponent was investigated in a polycrystalline material using the [Formula: see text]-state Potts model under the Monte Carlo simulation. The effect of particles present within the belly of grains and pinning on the grain boundaries are observed. The mean grain size under second phase particles obeys the square root dependency.
在冶金学中,微观组织的研究是评价材料性能的重要手段。蒙特卡罗方法应用于工程科学的许多领域,它是一种非常有效的方法来检查计算机模拟结构的拓扑结构,并完全类似于原子的静态行为。通过有效的二维模拟来了解晶粒生长动力学,第二相颗粒(杂质)的影响是控制微观结构的基础。优化了矩阵大小和[公式:见文本]状态。在蒙特卡罗模拟下,采用[公式:见文]-状态波茨模型研究了多晶材料的晶粒生长指数。观察了存在于晶粒腹部的颗粒和钉住对晶界的影响。第二相粒子的平均晶粒尺寸服从平方根关系。
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引用次数: 0
Penetration and uplift resistances of two interfering pipelines buried in clays 粘土中两条干扰管道的抗渗透和抗扬性能
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-08-16 DOI: 10.1142/s2047684121500202
Sorawit Seehavong, S. Keawsawasvong
The primary aim of this paper is to determine penetration and uplift resistances of two interfering pipelines buried in clay with a linear increase in strength. The advanced finite element limit analysis of upper and lower bound theorems is used to perform new limit analysis solutions for both penetration and uplift resistances of two interfering pipelines. The strength profiles of cohesive soils are the cases of normally consolidated clays in deep water by setting the shear strength at the ground surface to be zero and linearly increased with the depth. The twin pipelines have the same geometries and are simultaneously failed at the same magnitude of the failure uplift or bearing loads. There are three considered input parameters including the spacing between the pipes, the embedded depth of the pipes, and the unit weight of soils. All input parameters have significant influences on the penetration and uplift resistances of two interfering pipelines. Failure mechanisms of the problems are also investigated, and stability charts of the penetration and uplift resistances of two interfering pipelines are produced for practical uses in offshore geotechnical engineering.
本文的主要目的是确定强度线性增加的两条埋在粘土中的干扰管道的渗透阻力和抗拔阻力。采用上下限定理的先进有限元极限分析方法,对两条干扰管道的渗透阻力和抗拔阻力进行了新的极限分析求解。粘性土的强度剖面是深水中正常固结粘土的情况,通过将地面的剪切强度设置为零并随深度线性增加。双管道具有相同的几何形状,并且在相同的破坏提升或承载载荷大小下同时发生破坏。有三个考虑的输入参数,包括管道之间的间距、管道的嵌入深度和土壤的单位重量。所有输入参数对两条干扰管道的抗渗透性和抗扬性都有显著影响。文中还对这些问题的破坏机理进行了研究,并绘制了两条干扰管道的抗侵彻和抗扬稳定图,供海洋岩土工程实际应用。
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引用次数: 3
A 13-point sampling point scheme for 20-node brick elements 20节点砖元素的13点采样点方案
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-08-11 DOI: 10.1142/s2047684121500196
Shyjo Johnson, S. Sivakumar, D. Nagarajan
A new sampling point scheme with 13 evaluation points was introduced in this research study for 20-node brick elements. The new sampling points were located inside the brick element at the edges and the center point of the 20-node brick element. This integration scheme can be assumed to be an imitation of the Gaussian integration scheme. Standard benchmark problems were chosen from the different research works and compared with our proposed scheme. Finally, the proposed integration scheme achieves good results for 20-node brick elements on different performance parameters of finite element analysis.
针对20节点砖单元,提出了一种具有13个评价点的采样点方案。新的采样点位于砖单元内部的边缘和20节点砖单元的中心点。这种积分方案可以假定为高斯积分方案的一种模仿。从不同的研究工作中选择标准基准问题,并与我们提出的方案进行比较。最后,所提出的集成方案对20节点砖单元在不同性能参数下的有限元分析均取得了较好的结果。
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引用次数: 1
Temperature-dependent mixing behavior of Pb–Sb alloys in liquid state Pb–Sb合金在液态下的温度相关混合行为
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-08-04 DOI: 10.1142/s2047684121500184
I. Bhandari, N. Panthi, I. Koirala
We have extended a computational model used to research the thermodynamic properties of binary liquid alloys to study chemical short-range order parameters and diffusion coefficients. Numerous simulations have also been employed for surface properties such as surface concentration and surface tension. The propensities for phase separation of the Pb–Sb alloy were also observed with a temperature rise. The structural and thermodynamic properties of the alloys were measured using the same interaction parameters that are suitable for the free energy of mixing and mixing enthalpy. The interaction parameters are discovered to be temperature-dependent but concentration-independent. Our results indicate that the liquid alloy Pb–Sb has a weakly interacting composition. According to the surface property review, the element Sb having a higher surface concentration than its bulk concentration segregates over the surface of the alloy.
我们扩展了一个用于研究二元液体合金热力学性质的计算模型,以研究化学短程有序参数和扩散系数。许多模拟也被用于表面性质,例如表面浓度和表面张力。随着温度的升高,还观察到Pb–Sb合金的相分离倾向。使用适用于混合自由能和混合焓的相同相互作用参数测量合金的结构和热力学性能。发现相互作用参数与温度有关,但与浓度无关。我们的结果表明,液态合金Pb–Sb具有弱相互作用成分。根据表面性质综述,具有比其体浓度更高的表面浓度的元素Sb在合金表面上偏析。
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引用次数: 0
The natural neighbor radial point interpolation method in the Elasto-Static analysis of Honeycomb-Shaped foams 蜂窝泡沫弹静力分析中的自然邻域径向点插值法
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-07-05 DOI: 10.1142/S2047684121500147
N. Nascimento, J. Belinha, R. Jorge, D. Rodrigues
Cellular solid materials are progressively becoming more predominant in lightweight structural applications as more technologies realize these materials can be improved in terms of performance, quality control, repeatability and production costs, when allied with fast developing manufacturing technologies such as Additive Manufacturing. In parallel, the rapid advances in computational power and the use of new numerical methods, such as Meshless Methods, in addition to the Finite Element Method (FEM) are highly beneficial and allow for more accurate studies of a wide range of topologies associated with the architecture of cellular solid materials. Since these materials are commonly used as the cores of sandwich panels, in this work, two different topologies were designed — conventional honeycombs and re-entrant honeycombs — for 7 different values of relative density, and tested on the linear-elastic domain, in both in-plane directions, using the Natural Neighbor Radial Point Interpolation Method (NNRPIM), a newly developed meshless method, and the Finite Element Method (FEM) for comparison purposes.
随着越来越多的技术意识到,当与增材制造等快速发展的制造技术相结合时,这些材料可以在性能、质量控制、可重复性和生产成本方面得到改善,蜂窝固体材料在轻质结构应用中正逐渐占主导地位。同时,计算能力的快速进步和新的数值方法的使用,如无网格方法,以及有限元方法(FEM),是非常有益的,并允许对与蜂窝固体材料结构相关的广泛拓扑结构进行更准确的研究。由于这些材料通常用作夹芯板的核心,在这项工作中,针对7个不同的相对密度值,设计了两种不同的拓扑结构——传统蜂窝和凹入蜂窝,并使用自然邻居径向点插值法(NNRPIM)在两个平面内方向上的线弹性域上进行了测试,新开发的无网格方法和用于比较目的的有限元方法(FEM)。
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引用次数: 0
Closed-form expressions for bending and buckling of functionally graded nanobeams by the Laplace transform 用拉普拉斯变换求解功能梯度纳米梁弯曲和屈曲的闭合表达式
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-06-21 DOI: 10.1142/s2047684121500123
I. Nazmul, Indronil Devnath
This paper presents analytical solutions for bending and buckling of nonlocal functionally graded (FG) Euler–Bernoulli (EB) nanobeams. Material gradation along the thickness direction could be defined by a power function (P-FG), a sigmoidal function (S-FG), and an exponential function (E-FG). Laplace transform is applied to the differential form of the equation of motion of the nonlocal elasticity theory. Closed-form expressions for bending deflection and critical buckling load of FG nanobeams are derived. Effects of material gradations as well as the nonlocal parameter are examined. It is found that bending displacements and critical buckling loads could be controlled by an appropriate choice of material distribution parameter for P-FG nanobeams. The presented results also demonstrate the influences of factors such as the choice of material gradation, power-law index, and nonlocal parameter on bending and buckling behavior.
本文给出了非局部功能梯度(FG)欧拉-伯努利(EB)纳米梁弯曲和屈曲的解析解。材料沿厚度方向的渐变可以用幂函数(P-FG)、S-FG (S-FG)和指数函数(E-FG)来定义。将拉普拉斯变换应用于非局部弹性理论运动方程的微分形式。导出了FG纳米梁弯曲挠度和临界屈曲载荷的封闭表达式。考察了材料级配和非局部参数的影响。研究发现,合理选择P-FG纳米梁的材料分布参数可以控制其弯曲位移和临界屈曲载荷。结果还表明,材料级配选择、幂律指数、非局部参数等因素对弯曲屈曲行为的影响。
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引用次数: 5
A method for determining parameters of hyperelastic materials and its application in simulation of pneumatic soft actuator 一种超弹性材料参数确定方法及其在气动软执行器仿真中的应用
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-06-14 DOI: 10.1142/S2047684121500172
H. Dang, C. T. Vo, V. Nguyen, Hai Nam Nguyen, Anh Vang Tran, V. B. Phung
This paper presents a method for determining material constants of hyperelastic material used for building the soft robotic actuators. Sixty testpieces were made of silicone rubber with a shore A hardness from 20 A to 45 A. Each of them was then subjected to the uniaxial tensile test to obtain the stress–strain relationship, which is a key factor to evaluate the compatibility of the common six forms of strain energy density function for hyperelastic material. The sum of square error was used to determine the most relevant constitutive models, which are Ogden third order, Polynomial second order, and Yeoh, as well as parameter values of the corresponding materials. To analyze the appropriateness of these models for computation, six pneumatic soft actuators were built from materials with different hardness and tested for various pressures. From the simulation and experimental results, the model Yeoh has yielded the highest accuracy. This outcome forms a firm basis for the determination of suitable material in the computation and simulation of the pneumatic soft actuator. Besides, the obtained experimental results in this paper could be included in the database of hyperelastic material with different hardness for further simulation in the related field.
提出了一种确定柔性机器人作动器用超弹性材料材料常数的方法。60个测试件由肖氏硬度从20 a到45 a的硅橡胶制成。然后分别进行单轴拉伸试验,得到应力应变关系,这是评价超弹性材料常用的六种应变能密度函数的相容性的关键因素。利用误差平方和确定了最相关的Ogden三阶、多项式二阶和Yeoh本构模型,以及相应材料的参数值。为了分析这些模型的适用性,采用不同硬度的材料制作了6个气动软执行器,并在不同压力下进行了测试。从仿真和实验结果来看,Yeoh模型的精度最高。该结果为气动软执行器的计算和仿真中选择合适的材料奠定了坚实的基础。此外,本文所获得的实验结果可以纳入不同硬度的超弹性材料数据库,供相关领域的进一步模拟使用。
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引用次数: 1
Numerical study of forced imbibition phenomenon in fluid flow through a water-wet porous media 流体在水湿多孔介质中的强迫吸胀现象的数值研究
IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2021-06-14 DOI: 10.1142/S2047684121500160
J. Kesarwani, R. Meher
This paper presents a mathematical model to study forced imbibition and examine the correlation between spontaneous and forced imbibition in a water-wet heterogeneous porous media. An explicit approximate analytical method with its convergence analysis is proposed here to obtain an analytic expression for the saturation profile of the wetting phase along with its case study to discuss the potential effects and reliability of the viscosity ratio, wettability state of the medium, capillary pressure and relative permeability of the phases on forced imbibition phenomenon. Finally, the simulation results investigate the impact of all parameters on the hydrocarbon reservoir’s saturation rate and recovery rate during the forced imbibition process.
本文提出了一个研究水湿非均质多孔介质中强迫吸胀的数学模型,并考察了自发吸胀和强迫吸胀之间的关系。本文提出了一种具有收敛性分析的显式近似解析方法,得到了湿相饱和剖面的解析表达式,并结合实例讨论了黏度比、介质润湿性状态、毛管压力和相相对渗透率对强制吸胀现象的潜在影响和可靠性。最后,研究了强制渗吸过程中各参数对油藏饱和速率和采收率的影响。
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引用次数: 0
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International Journal of Computational Materials Science and Engineering
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