计算力学学报2017，Vol.34Issue(6)：800-806,7.DOI:10.7511/jslx201706018
一种简单的局部离散速度统一气体动理论格式
A simple local discrete velocity unified gas-kinetic scheme
秦浩 1宋亚辉 1李凯2
作者信息
- 1. 中国飞行试验研究院,西安阎良710089
- 2. 西安电子科技大学空间科学与技术学院,西安710071
- 折叠
摘要
Abstract
Unified gas-kinetic scheme (UGKS) is a numerical solver in all flow regimes from continuum flow to free molecule flow.In this approach,a global discrete velocity grid is usually used.For high speed flows,the difference of distribution functions at different fluid nodes might be very large.To ensure accuracy,the discrete velocity grid must be large enough to accommodate all fluid nodes and thus a large memory storage is required.In this paper,the local uniform discrete velocity grids are used.The width of each local discrete velocity grid is determined by the local state at fluid nodes.So the requirement of memory is reduced.Through the introduction of background grid,the interpolation of discrete velocity at different nodes is avoided.The method is tested by two 1D cases.It is shown that reliable results can be obtained using a local discrete velocity grid and the computational efficiency is obviously improved in high speed cases.关键词
统一气体动理论格式/全流域/局部离散速度/背景网格/计算效率Key words
unified gas-kinetic scheme/all flow regimes/local discrete velocity/background grid/computational efficiency分类
数理科学引用本文复制引用
秦浩,宋亚辉,李凯..一种简单的局部离散速度统一气体动理论格式[J].计算力学学报,2017,34(6):800-806,7.
