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An Immersed Boundary-Artificial Compressibility Method for Solving fluid-particle interaction Problems

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An Immersed Boundary-Artificial Compressibility Method for S...

The 4th Across-strait Workshop on Shock Wave/Vortex interaction

作者： Jeu-Jiun Hu San-Yih Lin She-Te University Kaoshing County National Chen-Kung University

A numerical method is developed to solve fluid-particle interaction *** method uses an artificial compressibility method to compute the incompressible viscous flows and further to simulate fluid-particle interaction problems with the immersed boundary method. The immersed boundary method introduces an immersed boundary force density to capture the particle *** fluid-particles interaction problems,the total force on a particle includes the external forces,such as the gravity force,the internally developed forces,such as the collision forces between particles,and the drag/lift forces in the fluid-particles interaction *** drag/lift forces are obtained by the immersed boundary *** test cases,flow past a circular cylinder,and sedimentation of two circular particles in a viscous fluid,are investigated by the proposed method.

关键词： Immersed Boundary Method fluid-particle interaction Artificial Compressibility

Discrete Modeling of fluid-particle interaction in Granular Media

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Discrete Modeling of Fluid-Particle Interaction in Granular ...

2012颗粒材料计算力学会议

作者： Zhao Ji-Dong Shan TongHong Kong University of Science and Technology,Clear Water Bay,Hong Kong

This paper presents a coupled Computational fluid Dynamics(CFD) and Discrete Element Method(DEM)approach to model the interaction between fluid and granular particles and its impact to relevant *** force and buoyancy force are considered to be the interaction forces exchanged between consecutiveDEM simulations and CFD *** numerical tool is verified by benchmarking simulations of thesettlement of single particle into water and the classic one-dimensional consolidation *** both cases goodagreements are found between the numerical predictions and the analytical *** have further applied thenumerical tool to the simulation of sand pile formed in water and debris flow into water *** varioussimulations demonstrate that the influence of fluid-particle interaction is well captured by the proposed method.

关键词： granular media fluid-particle interaction coupled CFD-DEM granular flow

Superquadric DEM-SPH coupling method for interaction between non-spherical granular materials and fluids

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Particuology 2022年第12期71卷 20-33页

作者： Ting Qiao Lu Liu Shunying Ji State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116024China

The research on the coupling method of non-spherical granular materials and fluids aims to predict the particle-fluid interaction in this study.A coupling method based on superquadric elements is developed to describe the interaction between non-spherical solid particles and *** discrete element method(DEM)and the smoothed particle hydrodynamics(SPH)are adopted to simulate granular materials and *** repulsive force model is adopted to calculate the coupling force and then a contact detection method is established for the interaction between the superquadric element and the fluid *** contact detection method captures the shape of superquadric element and calculates the distance from the fluid particle to the surface of superquadric *** cases focusing on the coupling force model,energy transfer,and large-scale calculations have been implemented to verify the validity of the proposed coupling *** coupling force model accurately represents the water entry process of a spherical solid particle,and reasonably reflects the difference of solid particles with different *** the water entry process of multiple solid particles,the total energy of the water entry process of multiple solid particles tends to be *** collapse process of the partially submerged granular column is simulated and analyzed under different ***,this coupling method is suitable to simulate fluid-particle systems containing solid particles with multiple shapes.

关键词： Superquadric function Discrete element method Smoothed particle hydrodynamics fluid-particle interaction Coupling method

DIRECT NUMERICAL SIMULATIONS OF THE DYNAMICS OF particleS WITH ARBITRARY SHAPES IN SHEAR FLOWS

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Journal of Hydrodynamics 2010年第4期22卷 456-465页

作者： CHOI Choeng Ryul KIM Chang Nyung Department of Mechanical Engineering Kyung Hee University College of Engineering Kyung Hee University Industrial Liaison Research Institute Kyung Hee University

A fluid-structure interaction method based on the arbitrary Lagrangian-Eulerian method and a dynamic mesh method was developed to simulate the dynamics of a rigid particle in shear *** the method,the governing equations for the fluid flow and particle motion were sequentially solved in a two-way coupling *** mesh system was deformed or re-meshed by the dynamic mesh *** method was employed to simulate the dynamics of a single particle suspended in a flow channel and the dynamics of the particle were *** simulation results show that the angular velocity is not only a function of the inclination angle,is but also influenced by the aspect ratio yielding a hysteresis,while the angular velocity obtained from the Keller-Scalak model is a function only of the inclination angle and does not show a *** present simulations clearly demonstrate that the fluid-Structure interaction（FSI） module is very stable,accurate and robust.

关键词： particle suspension fluid-Structure interaction (FSI) fluid-particle interaction particulate flow

Algorithms in a Robust Hybrid CFD-DEM Solver for particle-Laden Flows

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Communications in Computational Physics 2011年第2期9卷 297-323页

作者： Heng Xiao Jin Sun Institute of fluid Dynamics ETH Zürich8092 ZürichSwitzerland Institute for Infrastructure and Environment The University of EdinburghEdinburgh EH93JLUnited Kingdom

A robust and efficient solver coupling computational fluid dynamics(CFD)with discrete element method(DEM)is developed to simulate particle-laden flows in various physical *** interpolation algorithm suitable for unstructured meshes is proposed to translate between mesh-based Eulerian fields and particle-based Lagrangian *** interpolation scheme reduces the mesh-dependence of the averaging and interpolation *** addition,the fluid-particle interaction terms are treated semi-implicitly in this algorithm to improve stability and to maintain ***,it is demonstrated that sub-stepping is desirable for fluid-particle systems with small Stokes numbers.A momentum-conserving sub-stepping technique is introduced into the fluid-particle coupling procedure,so that problems with a wide range of time scales can be solved without resorting to excessively small time steps in the CFD *** numerical examples are presented to demonstrate the capabilities of the solver and the merits of the algorithm.

关键词： fluid-particle interaction particle-laden flow discrete element method computational fluid dynamics hybrid model

Numerical Simulation of Liquid-solid Flows Using the Discrete particle Method

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Numerical Simulation of Liquid-solid Flows Using the Discret...

2012颗粒材料计算力学会议

作者： Qiu Liu-Chao 1 Wu Chuan-Yu 2 1 Department of Applied Mechanics, China Agricultural University, Beijing 100083, China 2 School of Chemical Engineering, University of Birmingham, B25 2TT, UK

This paper presents a numerical method coupling the discrete element method (DEM) and the computational fluid dynamics (CFD) to simulate multiphase liquid flows with poly-dispersed particles. In this coupled method, liquids are modelled using a weakly compressible flow model in the Eulerian frame with Navier-Stokes equations while the discrete particle motion is solved using DEM in which the particle–particle interaction are based on theoretical contact mechanics thereby enabling particles to be directly specified using realistic material properties such as friction and elasticity. The developed method was validated by comparison of numerical results with analytic solution and experimental data in the literature. Computational simulations have been conducted in three dimensions to model size-driven segregation phenomenon in aqueous suspensions. It has been illustrated that the proposed DEM/CFD method is a robust tool for analysing the microscopic behaviour of polydisperse liquid-particles system.

关键词： discrete element method computational fluid dynamics liquid-particles flows fluid-particle interaction multiphase flows weakly compressible flow

发展压力修正法计算流体与颗粒交互作用问题(英文)

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发展压力修正法计算流体与颗粒交互作用问题(英文)

2009年度海峡两岸工程力学研讨会

作者：林三益陳翼正国立成功大学航空太空系

A direct-forcing pressure correction method is developed to simulate fluid-particle interaction *** method applies an implicit pressure correction method to solve the incompressible flow field and the immersed boundary method which applies a direct forcing method to capture the particle *** applying the direct forcing method,the pressure correction method can eliminate the needs for the determination of free parameters,such as the stiffness coefficient in the elastic forcing method,and for the approximation of the delta *** direct forcing method can be seen as a splitting projection operator which directly projects the fluid velocity obtained from the pressure correction method to capture the particle *** direct forcing method directly computes the artificial forcing at flow elements which eliminates the transformation between flow element and particle *** makes the new method simpler and more *** sedimentations of one and two sphere particles are simulated to validate the numerical *** a demonstration of the efficient and capabilities of the new method,sedimentation of a large number of sphere particles in an enclosure is simulated.

关键词： immersed boundary method pressure correction method fluid-particle interaction direct forcing splitting projection operator sedimentation