A Normal Mode Stability Analysis of Numerical Interface Conditions for Fluid/Structure Interaction
作者机构:Center for Applied Scientific ComputingLawrence Livermore National LaboratoryLivermoreCA 94551USA
出 版 物:《Communications in Computational Physics》 (计算物理通讯(英文))
年 卷 期:2011年第10卷第7期
页 面:279-304页
核心收录:
学科分类:07[理学] 0704[理学-天文学] 0701[理学-数学] 0702[理学-物理学] 070101[理学-基础数学]
主 题:Finite difference method normal mode analysis fluid/structure interaction compressible fluid interface condition
摘 要:In multi physics computations where a compressible fluid is coupled with a linearly elastic solid,it is standard to enforce continuity of the normal velocities and of the normal stresses at the interface between the fluid and the *** a numerical scheme,there are many ways that velocity-and stress-continuity can be enforced in the discrete *** paper performs a normal mode stability analysis of the linearized problem to investigate the stability of different numerical interface conditions for a model problem approximated by upwind type finite difference *** analysis shows that depending on the ratio of densities between the solid and the fluid,some numerical interface conditions are stable up to the maximal CFL-limit,while other numerical interface conditions suffer from a severe reduction of the stable *** paper also presents a new interface condition,obtained as a simplified characteristic boundary condition,that is proved to not suffer from any reduction of the stable *** experiments in one space dimension show that the new interface condition is stable also for computations with the non-linear Euler equations of compressible fluid flow coupled with a linearly elastic solid.