A Preliminary Calculation of Three-Dimensional Unsteady Underwater Cavitating Flows Near Incompressible Limit  

作　　者：Yang-Yao Niu Wei-Yuan Hsu 

机构地区：[1]Department of Mechanical Engineering,Chung-Hua University,Hsin-Chu,Taiwan,30067,ROC.

出　　处：《Communications in Computational Physics》2008年第9期894-910,共17页计算物理通讯（英文）

基　　金：the National Science Council under the project NSC 96-2623-7-216-001-D.

摘　　要：Recently,cavitated flows over underwater submerged bodies have attracted researchers to simulate large scale cavitation.Comparatively Computational Fluid Dynamics(CFD)approaches have been used widely and successfully to model developed cavitation.However,it is still a great challenge to accurately predict cavitated flow phenomena associated with interface capturing,viscous effects,unsteadiness and three-dimensionality.In this study,we consider the preconditioned three-dimensional multiphase Navier-Stokes equations comprised of the mixture density,mixture momentum and constituent volume fraction equations.A dual-time implicit formulation with LU Decomposition is employed to accommodate the inherently unsteady physics.Also,we adopt the Roe flux splitting method to deal with flux discretization in space.Moreover,time-derivative preconditioning is used to ensure well-conditioned eigenvalues of the high density ratio two-phase flow system to achieve computational effi-ciency.Validation cases include an unsteady 3-D cylindrical headform cavitated flow and an 2-D convergent-divergent nozzle channel cavity-problem.

关 键 词：CAVITATION INCOMPRESSIBLE Roe Riemann solver dual-time stepping 

分 类 号：O35[理学—流体力学]