Pub Date : 2022-01-01DOI: 10.12677/ijfd.2022.102002
静远 杨
To investigate why the current turbulent models cannot represent shaking behaviors in the wake of turbulent cylindrical flow, the three-dimensional direct numerical simulations of incompressible cylindrical flow were performed. We used Lagrangian inertia-less particles to collect the information of turbulent fields, and discussed the features of diffusion of disturbs near the cylindrical walls. It was found via the numerical experiments that: 1) Fluctuations of turbulent kinetic energy and dissipation rate of kinetic energy occurred in the cases of higher Reynolds numbers; this behavior may be caused by the disturbs from the walls. 2) It was expected that directions of Reynolds stress and macro-scale strain of fluid velocity are aligned or independent, but this pre-杨静远，丁桦
{"title":"Statistics of Turbulence in Cylindrical Flow","authors":"静远 杨","doi":"10.12677/ijfd.2022.102002","DOIUrl":"https://doi.org/10.12677/ijfd.2022.102002","url":null,"abstract":"To investigate why the current turbulent models cannot represent shaking behaviors in the wake of turbulent cylindrical flow, the three-dimensional direct numerical simulations of incompressible cylindrical flow were performed. We used Lagrangian inertia-less particles to collect the information of turbulent fields, and discussed the features of diffusion of disturbs near the cylindrical walls. It was found via the numerical experiments that: 1) Fluctuations of turbulent kinetic energy and dissipation rate of kinetic energy occurred in the cases of higher Reynolds numbers; this behavior may be caused by the disturbs from the walls. 2) It was expected that directions of Reynolds stress and macro-scale strain of fluid velocity are aligned or independent, but this pre-杨静远，丁桦","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099298","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 : 2022-01-01DOI: 10.12677/ijfd.2022.104006
阳贵 李
Phase separation is an unstable tendency and process of separating two or more phases from the original mixed fluids due to the change in environmental conditions. It is one of the core contents in the study of multiphase fluids. In this paper, the phase separation behavior of binary fluids under the change of temperature is studied by the free-energy lattice Boltzmann model coupling the fluid viscosity and temperature.
{"title":"Lattice Boltzmann Numerical Simulation of Phase Separation Induced by Variable Temperature Field","authors":"阳贵 李","doi":"10.12677/ijfd.2022.104006","DOIUrl":"https://doi.org/10.12677/ijfd.2022.104006","url":null,"abstract":"Phase separation is an unstable tendency and process of separating two or more phases from the original mixed fluids due to the change in environmental conditions. It is one of the core contents in the study of multiphase fluids. In this paper, the phase separation behavior of binary fluids under the change of temperature is studied by the free-energy lattice Boltzmann model coupling the fluid viscosity and temperature.","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099529","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 : 2022-01-01DOI: 10.12677/ijfd.2022.104005
丽梅 段
Convection-diffusion equations are an important class of partial differential equations that arise in many scientific fields including fluid mechanics, gas dynamics and so on. Since these equations
{"title":"The DG Finite Element Method for Convection-Diffusion Eigenvalue Problems","authors":"丽梅 段","doi":"10.12677/ijfd.2022.104005","DOIUrl":"https://doi.org/10.12677/ijfd.2022.104005","url":null,"abstract":"Convection-diffusion equations are an important class of partial differential equations that arise in many scientific fields including fluid mechanics, gas dynamics and so on. Since these equations","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099467","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 : 2022-01-01DOI: 10.12677/ijfd.2022.101001
斯日古楞 何
In this paper, for the initial boundary value problem of the Burgers equation, the optimal stress point is used to construct a dual partition, and based on the trial function space of piecewise cubic Lagrange interpolation and the test function space of piecewise constant, the Crank-Nicolson cubic finite volume element scheme is constructed. And the L 2 norm optimal order error estimate of the numerical solutions and the super-convergence error estimate of the derivative at the optimal stress node are proved. Finally, numerical examples are given to verify the theoretical analysis results and the validity of the proposed scheme.
{"title":"A Cubic Finite Volume Element Method for the Burgers Equation","authors":"斯日古楞 何","doi":"10.12677/ijfd.2022.101001","DOIUrl":"https://doi.org/10.12677/ijfd.2022.101001","url":null,"abstract":"In this paper, for the initial boundary value problem of the Burgers equation, the optimal stress point is used to construct a dual partition, and based on the trial function space of piecewise cubic Lagrange interpolation and the test function space of piecewise constant, the Crank-Nicolson cubic finite volume element scheme is constructed. And the L 2 norm optimal order error estimate of the numerical solutions and the super-convergence error estimate of the derivative at the optimal stress node are proved. Finally, numerical examples are given to verify the theoretical analysis results and the validity of the proposed scheme.","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099260","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}
Limited by the size of the urban site, the design of flow paths in China’s urban drainage pumping stations is becoming more complex, generally with deep, narrow and long flow channels. This leads to the existence of backflow, uneven flow velocity distribution and other undesirable flow patterns in the inlet channel of the pumping station, which affect the stable operation of the
{"title":"Research on Flow Optimization of Complex Urban Pumping Station Flow Paths by Combined Rectification Measures","authors":"怀远 张","doi":"10.12677/ijfd.2022.104","DOIUrl":"https://doi.org/10.12677/ijfd.2022.104","url":null,"abstract":"Limited by the size of the urban site, the design of flow paths in China’s urban drainage pumping stations is becoming more complex, generally with deep, narrow and long flow channels. This leads to the existence of backflow, uneven flow velocity distribution and other undesirable flow patterns in the inlet channel of the pumping station, which affect the stable operation of the","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099444","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 : 2021-01-01DOI: 10.12677/ijfd.2021.92002
鹏 孙
{"title":"Wind Load Distribution and Comparative Analysis of Two Kinds of Tensile Membrane Structures in a Railway Station","authors":"鹏 孙","doi":"10.12677/ijfd.2021.92002","DOIUrl":"https://doi.org/10.12677/ijfd.2021.92002","url":null,"abstract":"","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099500","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 : 2021-01-01DOI: 10.12677/ijfd.2021.94008
小梅 孙
In the process of water conservancy project design and construction, strict experiments should be carried out on the geology and soil conditions at the foundation surface of various water conser-vancy buildings to determine their various properties, such as compressibility, water permeability, bulk density, porosity, etc. Some dams are directly filled with earth and rock materials. Even after the completion of dam construction, the water permeability and settlement of foundation or dam body should be often monitored. Therefore, higher requirements are put forward for the understanding of soil engineering properties. The soil mechanics experiment—soil compression test is the required experiment, taking the experimental data recorded in the experiment as the statistics, supplemented by the knowledge of binary analysis of variance in statistics, to judge the influence of time and load on soil compression deformation variables in the compression test. It can be seen from the experimental results that the load factor has the greatest impact on the test, that is, the most significant is the time factor, although it has an impact on the results, it is not significant. The results of this study have reference significance for water conservancy projects.
{"title":"Influence of Time and Load on Soil Deformation in Soil Compression Test","authors":"小梅 孙","doi":"10.12677/ijfd.2021.94008","DOIUrl":"https://doi.org/10.12677/ijfd.2021.94008","url":null,"abstract":"In the process of water conservancy project design and construction, strict experiments should be carried out on the geology and soil conditions at the foundation surface of various water conser-vancy buildings to determine their various properties, such as compressibility, water permeability, bulk density, porosity, etc. Some dams are directly filled with earth and rock materials. Even after the completion of dam construction, the water permeability and settlement of foundation or dam body should be often monitored. Therefore, higher requirements are put forward for the understanding of soil engineering properties. The soil mechanics experiment—soil compression test is the required experiment, taking the experimental data recorded in the experiment as the statistics, supplemented by the knowledge of binary analysis of variance in statistics, to judge the influence of time and load on soil compression deformation variables in the compression test. It can be seen from the experimental results that the load factor has the greatest impact on the test, that is, the most significant is the time factor, although it has an impact on the results, it is not significant. The results of this study have reference significance for water conservancy projects.","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099193","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 : 2021-01-01DOI: 10.12677/ijfd.2021.93004
林峰 吴
In order to explore the influence of contraction and expansion nozzle on cavitation jet under different working conditions, ICEM mesh generation software and FLUENT fluid simulation software
{"title":"Numerical Simulation of Internal and External Flow Field of Contraction and Expansion Nozzle","authors":"林峰 吴","doi":"10.12677/ijfd.2021.93004","DOIUrl":"https://doi.org/10.12677/ijfd.2021.93004","url":null,"abstract":"In order to explore the influence of contraction and expansion nozzle on cavitation jet under different working conditions, ICEM mesh generation software and FLUENT fluid simulation software","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099057","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 : 2021-01-01DOI: 10.12677/ijfd.2021.93005
秋明 葛
Biomimetic fractal tree microchannel has been widely studied because of its uniform velocity distribution and high heat transfer efficiency. Under the condition of constant cross-sectional area
{"title":"Numerical Study on Heat Dissipation Performance of Fractal Tree Microchannel","authors":"秋明 葛","doi":"10.12677/ijfd.2021.93005","DOIUrl":"https://doi.org/10.12677/ijfd.2021.93005","url":null,"abstract":"Biomimetic fractal tree microchannel has been widely studied because of its uniform velocity distribution and high heat transfer efficiency. Under the condition of constant cross-sectional area","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66099132","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 : 2021-01-01DOI: 10.12677/ijfd.2021.91001
敏 王
{"title":"Neural Network Flow Field Prediction Model Coupled with Fluid Dynamics Equations","authors":"敏 王","doi":"10.12677/ijfd.2021.91001","DOIUrl":"https://doi.org/10.12677/ijfd.2021.91001","url":null,"abstract":"","PeriodicalId":66025,"journal":{"name":"流体动力学","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66098974","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}
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