An Implicit Gas-Kinetic Scheme for Turbulent Flow on Unstructured Hybrid Mesh

Autor:	Pan, Dongxin, Zhong, Chengwen, Zhuo, Congshan
Rok vydání:	2017
Předmět:	Physics - Computational Physics 47.45.Ab(Primary) 02.70.-c 47.11.Df 47.27.E- (Secondary) G.1.8 J.2
Druh dokumentu:	Working Paper
Popis:	In this study, an implicit scheme for the gas-kinetic scheme (GKS) on the unstructured hybrid mesh is proposed. The Spalart-Allmaras (SA) one equation turbulence model is incorporated into the implicit gas-kinetic scheme (IGKS) to predict the effects of turbulence. The implicit macroscopic governing equations are constructed and solved by the matrix-free lower-upper symmetric-Gauss-Seidel (LU-SGS) method. To reduce the number of cells and computational cost, the hybrid mesh is applied. A modified non-manifold hybrid mesh data(NHMD) is used for both unstructured hybrid mesh and uniform grid. Numerical investigations are performed on different 2D laminar and turbulent flows. The convergence property and the computational efficiency of the present IGKS method are investigated. Much better performance are obtained compared with the standard explicit gas-kinetic scheme. Also, our numerical results are found to be in good agreement with experiment data and other numerical solutions, demonstrating the good applicability and high efficiency of the present IGKS for the simulations of laminar and turbulent flows. Comment: 30Pages, 27figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1709.00803 Zobrazit plný text záznamu View this record from Arxiv