检索结果-南通市图书馆

The modified ghost fluid method Applied to fluid-Elastic Structure Interaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2011年第5期3卷 611-632页

作者： Tiegang Liu A.W.Chowdhury Boo Cheong Khoo LMIB and School of Mathematics and Systems Science Beijing University of Aeronautics and AstronauticsBeijing 100191China Department of Mechanical Engineering National University of SingaporeSingapore 119260Singapore Singapore-MIT Alliance 4 Engineering Drive 3National University of SingaporeSingapore 117576Singapore

In this work,the modified ghost fluid method is developed to deal with 2D compressible fluid interacting with elastic solid in an Euler-Lagrange coupled *** applying the modified ghost fluid method to treat the fluid-elastic solid coupling,the Navier equations for elastic solid are cast into a system similar to the Euler equations but in Lagrangian ***,to take into account the influence of material deformation and nonlinear wave interaction at the interface,an Euler-Lagrange Riemann problem is constructed and solved approximately along the normal direction of the interface to predict the interfacial status and then define the ghost fluid and ghost solid *** tests are presented to verify the resultant method.

关键词： fluid-elastic structure interaction Euler-Lagrange coupling Euler-Lagrange Riemann problem ghost fluid method modified ghost fluid method

Optimal Error Estimation of the modified ghost fluid method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2010年第7期8卷 403-426页

作者： Liang Xu Tiegang Liu LMIB and School of Mathematics and Systems Science Beijing University of Aeronautics and AstronauticsBeijing 100191China

The modified ghost fluid method(MGFM)has been shown to be robust and efficient when being applied to multi-medium compressible *** this paper,we rigorously analyze the optimal error estimation of the MGFM when it is applied to the multi-fluid Riemann *** analyzing the properties of the MGFM and the approximate Riemann problem solver(ARPS),we show that the interfacial status provided by the MGFM can achieve“third-order accuracy”in the sense of comparing to the exact solution of the Riemann problem,regardless of the solution *** addition,our analysis further reveals that the ARPS based on a doubled shock structure in the MGFM is suitable for almost any conditions for predicting the interfacial status,and that the“natural”approach of“third-order accuracy”is practically less *** examples are presented to validate the conclusions made.

关键词： modified ghost fluid method Riemann problem approximate Riemann problem solver

Computation of compressible flows with high density ratio and pressure ratio

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2008年第5期29卷 673-682页

作者：陈荣三 Department of Mathematics Shanghai University

The WENO method, RKDG method, RKDG method with original ghost fluid method, and RKDG method with modified ghost fluid method are applied to singlemedium and two-medium air-air, air-liquid compressible flows with high density and pressure ratios： We also provide a numerical comparison and analysis for the above methods. Numerical results show that, compared with the other methods, the RKDG method with modified ghost fluid method can obtain high resolution results and the correct position of the shock, and the computed solutions are converged to the physical solutions as themesh is refined.

关键词： modified ghost fluid method high density ratio high pressure ratio RKDG finite element method

A High Order Sharp-Interface method with Local Time Stepping for Compressible Multiphase Flows

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2011年第1期9卷 205-230页

作者： Angela Ferrari Claus-Dieter Munz Bernhard Weigand Institute of Aerodynamics and Gasdynamics University of StuttgartPfaffenwaldring 21D-70569 StuttgartGermany Institute of Aerospace Thermodynamics University of StuttgartPfaffenwaldring 31D-70569 StuttgartGermany

In this paper,a new sharp-interface approach to simulate compressible multiphase flows is *** new scheme consists of a high order WENO finite volume scheme for solving the Euler equations coupled with a high order pathconservative discontinuous Galerkin finite element scheme to evolve an indicator function that tracks the material *** the interface our method applies ghost cells to compute the numerical flux,as the ghost fluid ***,unlike the original ghost fluid scheme of Fedkiw et al.[15],the state of the ghost fluid is derived from an approximate-state Riemann solver,similar to the approach proposed in[25],but based on a much simpler *** formulation leads only to one single scalar nonlinear algebraic equation that has to be solved at the interface,instead of the system used in[25].Away from the interface,we use the new general Osher-type flux recently proposed by Dumbser and Toro[13],which is a simple but complete Riemann solver,applicable to general hyperbolic conservation *** time integration is performed using a fully-discrete one-step scheme,based on the approaches recently proposed in[5,7].This allows us to evolve the system also with time-accurate local time *** to the sub-cell resolution and the subsequent more restrictive time-step constraint of the DG scheme,a local evolution for the indicator function is applied,which is matched with the finite volume scheme for the solution of the Euler equations that runs with a larger time *** use of a locally optimal time step avoids the introduction of excessive numerical diffusion in the finite volume *** different fluids have been used,namely an ideal gas and a weakly compressible fluid modeled by the Tait *** tests have been computed to assess the accuracy and the performance of the new high order scheme.A verification of our algorithm has been carefully carried out using exact solutions as well as a comparison with other numerical re

关键词： Sharp interface capturing compressible multiphase flows one-step time-integration time-accurate local time stepping modified ghost fluid method WENO schemes discontinuous Galerkin methods

ghost-fluid-Based Sharp Interface methods for Multi-Material Dynamics:A Review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2023年第8期34卷 563-612页

作者： Liang Xu Tiegang Liu China Academy of Aerospace Aerodynamics Beijing 100074China LMIB and School of Mathematical Sciences Beihang UniversityBeijing 100191China

The ghost fluid method(GFM)provides a simple way to simulate the interaction of immiscible ***,the modified GFM(MGFM)and its variants,based on the solutions of multi-material Riemann problems,are capable of faithfully taking into account the effects of nonlinear wave interaction and material property near the *** treatments for ghost fluid states or interface conditions have been shown to be crucial when applied to various interfacial phenomena involving large discontinuity and strong *** methods,therefore,have great potential in engineering *** this paper,we review the development of such *** methodologies of representative GFM-based algorithms for definition of interface conditions are illustrated and compared to each *** research progresses in design principle and accuracy analysis are briefly *** steps and techniques for multi-dimensional extension are also *** addition,we present some progresses in more challenging scientific problems,including a variety of fluid/solid-fluid/solid interactions with complex physical *** course the challenges faced by researchers in this field are also discussed.

关键词： Multi-material flows sharp-interface method ghost fluid method modified ghost fluid method fluid-solid interaction multi-material Riemann problem