检索结果-南通市图书馆

Comparison of Lattice Boltzmann,Finite Element and Volume of Fluid multicomponent Methods for Microfluidic flow Problems and the Jetting of Microdroplets

引用

Communications in Computational Physics 2023年第3期33卷 912-936页

作者： Karun P.N.Datadien Gianluca Di Staso Christian Diddens Herman M.A.Wijshoff Federico Toschi Department of Applied Physics and Science Education Eindhoven University of Technology5600MB EindhovenNetherlands flow Matters Consultancy B.V. 5612AEEindhovenThe Netherlands Physics of Fluids group Department of Science and TechnologyMesa+InstituteMax Planck Center for Complex Fluid Dynamics and J.M.Burgers Centre for Fluid DynamicsUniversity of TwenteP.O.Box 2177500 AE EnschedeThe Netherlands Canon Production Printing Netherlands B.V. 5914 HHVenloThe Netherlands Department of Mathematics and Computer Science Eindhoven University of Technology5600MB EindhovenNetherlands Istituto per le Applicazioni del Calcolo Consiglio Nazionale delle Ricerche00185 RomeItaly.

We show that the lattice Boltzmann method(LBM)based color-gradient model with a central moments formulation(CG-CM)is capable of accurately simulating the droplet-on-demand inkjetting process on a micrometer length scale by comparing it to the Arbitrary Lagrangian Eulerian Finite Element Method(ALE-FEM).A full jetting cycle is simulated using both CG-CM and ALE-FEMand results are quantitatively compared by measuring the ejected ink velocity,volume and contraction *** also show that the individual relevant physical phenomena are accurately captured by considering three test-cases;droplet oscillation,ligament contraction and capillary *** first two cases test accuracy for a dynamic system where surface tension is the driving force and the third case is designed to test wetting boundary *** the first two cases we also compare the CG-CM and ALE-FEM results to Volume of Fluid(VOF)*** of the three methods shows close agreement when compared to each other and analytical solutions,where *** we demonstrate that asymmetric jetting is achievable using 3D CG-CM simulations utilizing asymmetric wetting conditions inside the *** allows for systematic investigation into the physics of asymmetric jetting,*** to jet-nozzle manufacturing imperfections or due to other disturbances.

关键词： Lattice Boltzmann method multiphase flow multicomponent flow inkjet printing

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IMPLEMENTATION OF MIXED METHODS AS FINITE DIFFERENCE METHODS AND APPLICATIONS TO NONISOTHERMAL MULTIPHASE flow IN POROUS MEDIA

引用

Journal of Computational Mathematics 2006年第3期24卷 281-294页

作者： Zhang-xin Chen Xi-jun Yu Center for Scientific Computation Box 750156 Southern Methodist University Dallas TX 75275-0156 USA Research Center for Science Xi'an Jiaotong University Xi'an 710049 China Center for Advanced Reservoir Modeling and Simulation College Vof Engineering'PekingI University China Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics Beijing 100088 China

In this paper we consider mixed finite element methods for second order elliptic problems. In the case of the lowest order Brezzi-Douglas-Marini elements （if d = 2） or Brezzi- Douglas-Duran-Fortin elements （if d = 3） on rectangular parallelepipeds, we show that the mixed method system, by incorporating certain quadrature rules, can be written as a simple, cell-centered finite difference method. This leads to the solution of a sparse, positive semidefinite linear system for the scalar unknown. For a diagonal tensor coefficient, the sparsity pattern for the scalar unknown is a five point stencil if d = 2, and seven if d = 3. For a general tensor coefficient, it is a nine point stencil, and nineteen, respectively. Applications of the mixed method implementation as finite differences to nonisothermal multiphase, multicomponent flow in porous media are presented.

关键词： Finite difference Implementation Mixed method Error estimates Superconvergence Tensor coefficient Nonisothermal multiphase multicomponent flow Porousmedia.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Simulation Approach Including Underresolved Scales for Two-Component Fluid flows in Multiscale Porous Structures

引用

Communications in Computational Physics 2023年第1期33卷 189-213页

作者： Hiroshi Otomo Rafael Salazar-Tio Jingjing Yang Hongli Fan Andrew Fager Bernd Crouse Raoyang Zhang Hudong Chen Dassault Systemes 185 Wyman StreetWalthamMA 02451USA

.In this study,we develop computational models and a methodology for accurate multicomponent flow simulation in underresolved multiscale porous structures[1].It is generally impractical to fully resolve the flow in porous structures with large length-scale differences due to the tremendously high computational *** flow contributions from underresolved scales should be taken into account with proper physics modeling and simulation *** precomputed physical properties such as the absolute permeability,K_(0),the capillary pressure-saturation curve,and the relative permeability,K_(r),in typical resolved porous structures,the local fluid force is determined and applied to simulations in the underresolved regions,which are represented by porous *** this way,accurate flow simulations in multiscale porous structures become *** evaluate the accuracy and robustness of this method,a set of benchmark test cases are simulated for both single-component and two-component flows in artificially constructed multiscale porous *** comparisons with analytic solutions and results with much finer resolution resolving the porous structures,the simulated results are ***,in all cases,the results successfully show high accuracy with proper input of K_(0),capillary pressure,and K_(r).Specifically,imbibition patterns,entry pressure,residual component patterns,and absolute/relative permeability are accurately captured with this approach.

关键词： Multiscale simulation porous media multicomponent flow lattice Boltzmann method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Quantitative Comparison of Physical Accuracy and Numerical Stability of Lattice Boltzmann Color Gradient and Pseudopotential multicomponent Models for Microfluidic Applications

引用

Communications in Computational Physics 2022年第7期32卷 450-489页

作者： Karun P.N.Datadien Gianluca Di Staso Herman M.A.Wijshoff Federico Toschi Department of Applied Physics Eindhoven University of Technology5612 AZ EindhovenNetherlands flow Matters Consultancy B.V. 5612AEEindhovenThe Netherlands Department of Mechanical Engineering Eindhoven University of Technology5612 AZ EindhovenNetherlands Canon Production Printing Netherlands B.V. 5914 HHVenloThe Netherlands Department of Mathematics and Computer Science Eindhoven University of Technology5612 AZ EindhovenNetherlands Istituto per le Applicazioni del Calcolo Consiglio Nazionale delle Ricerche00185 RomeItaly

The performances of the Color-Gradient(CG)and the Shan-Chen(SC)multicomponent Lattice Boltzmann models are quantitatively compared side-by-side on multiple physical flow problems where breakup,coalescence and contraction of fluid ligaments are *** flow problems are relevant to microfluidic applications,jetting of microdroplets as seen in inkjet printing,as well as emulsion dynamics.A significantly wider range of parameters is shown to be accessible for CG in terms of density-ratio,viscosity-ratio and surface tension *** stability for a high density ratio O(1000)is required for simulating the drop formation process during inkjet printing which we show here to be achievable using the CG model but not using the SC *** results show that the CG model is a suitable choice for challenging simulations of droplet formation,due to a combination of both numerical stability and physical *** also present a novel approach to incorporate repulsion forces between interfaces for CG,with possible applications to the study of stabilized ***,we show that the CG model can produce similar results to a known multirange potentials extension of the SC model for modelling a disjoining pressure,opening up its use for the study of dense stabilized emulsions.

关键词： Lattice Boltzmann method multiphase flow multicomponent flow inkjet printing turbulent emulsion

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Numerical Stability Analysis for a Stationary and Translating Droplet at Extremely Low Viscosity Values Using the Lattice Boltzmann Method Color-GradientMulti-Component Model with Central Moments Formulation

引用

Communications in Computational Physics 2023年第1期33卷 330-348页

作者： Karun P.N.Datadien Gianluca Di Staso Federico Toschi Department of Applied Physics and Science Education Eindhoven University of Technology5600MB EindhovenNetherlands flow Matters Consultancy B.V. 5612AEEindhovenThe Netherlands Istituto per le Applicazioni del Calcolo Consiglio Nazionale delle Ricerche00185 RomeItaly

multicomponent models based on the Lattice Boltzmann Method(LBM)have clear advantages with respect to other approaches,such as good parallel performances and scalability and the automatic resolution of breakup and coalescence *** flow simulations are useful for a wide range of applications,yet many multicomponent models for LBMare limited in their numerical stability and therefore do not allow exploration of physically relevant low viscosity *** we performa quantitative study and validations,varying parameters such as viscosity,droplet radius,domain size and acceleration for stationary and translating droplet simulations for the color-gradientmethod with centralmoments(CG-CM)formulation,as this method promises increased numerical stability with respect to the *** focus on numerical stability and on the effect of decreasing grid-spacing,*** resolution,in the extremely low viscosity regime for stationary droplet *** effects of small-and large-scale anisotropy,due to grid-spacing and domain-size,respectively,are investigated for a stationary *** effects on numerical stability of applying a uniform acceleration in one direction on the domain,*** both the droplet and the ambient,is explored into the low viscosity regime,to probe the numerical stability of the method under dynamical conditions.

关键词： Lattice Boltzmann method multicomponent flow numerical stability low viscosity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Study of Fluid Interfaces and Moving Contact Lines Using the Lattice Boltzmann Method

引用

Communications in Computational Physics 2013年第3期13卷 725-740页

作者： S.Srivastava P.Perlekar L.Biferale M.Sbragaglia J.H.M.ten Thije Boonkkamp F.Toschi Department of Applied Physics Eindhoven University of TechnologyPO Box 5135600 MB EindhovenThe Netherlands Department of Mathematics and Computer Science Eindhoven University of TechnologyPO Box 5135600 MB EindhovenThe Netherlands Department of Physics and INFN University of Rome Tor VergataVia della Ricerca Scientifica 100133 RomeItaly

We study the static and dynamical behavior of the contact line between two fluids and a solid plate by means of the Lattice Boltzmann method(LBM).The different fluid phases and their contact with the plate are simulated by means of standard Shan-Chen *** investigate different regimes and compare the multicomponent *** multiphase LBM models near the contact line.A static interface profile is attained with the multiphase model just by balancing the hydrostatic pressure(due to gravity)with a pressure jump at the *** order to study the same problem with the multicomponent case we propose and validate an idea of a body force acting only on one of the two fluid *** order to reproduce results matching an infinite bath,boundary conditions at the bath side play a key *** quantitatively compare open and wall boundary conditions and study their influence on the shape of the meniscus against static and lubrication theory solution.

关键词： Lattice-Boltzmann multiphase flow multicomponent flow plunging plate problem Landau-Levich

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：