Numerical prediction of inner turbulent flow in conical diffuser by using a new five-point scheme and DLR k-ε turbulence model
The internal turbulent flow in conical diffuser is a very complicated adverse pressure gradient flow. DLR k-ε turbulence model was adopted to study it. The every terms of the Laplace operator in DLR k-ε turbulence model and pressure Poisson equation were discretized by upwind difference scheme. A new full implicit difference scheme of 5-point was constructed by using finite volume method and finite difference method. A large sparse matrix with five diagonals was formed and was stored by three arrays of one dimension in a compressed mode. General iterative methods do not work well with large sparse matrix. With algebraic multigfid method(AMG), linear algebraic system of equations was solved and the precision was set at 10-6. The computation results were compared with the experimental results. The results show that the computation results have a good agreement with the experiment data. The precision of computational results and numerical simulation efficiency are greatly improved.
conical diffuser turbulent flow DLR k-ε turbulence model 5-point scheme algebraic multigrid method(AMG)
JIANG Guang-biao(蒋光彪) HE Yong-sen(何永森) SHU Shi(舒适) XIAO Yin-xiong(肖映雄)
College of Mathematics and Computational Science, Xiangtan University, Xiangtan 411105, China; Hunan Key Laboratory for Computation and Simulation in Science and Engineering,Xiangtan University, Xiangtan 411105, China
国际会议
长沙
英文
181-186
2008-09-28（万方平台首次上网日期，不代表论文的发表时间）