自适应笛卡尔网格超声速黏性流动数值模拟

doi:10.7527/S1000-6893.2017.21697

Abstract

Abstract: In comparison with the structured and the unstructured grids, the adaptive Cartesian grid can generate grid of high quality automatically, and has the application prospect in reducing manual labor. An adaptive Cartesian grid generation methodology with automation and efficiency under the two-dimensional condition is developed in this paper. The quadtree data structure is used for grids storage, making it trivial to accomplish grid adaptation. The grids are coarsened or refined based on the geometric features and solution for the flow field. The curvature corrected symmetry technique combined with the immersed boundary method is adopted to deal with the viscous boundary condition, achieving good results in computation of the viscous flow. A method for handling the multi-valued grids near thin surfaces and sharp corners is also developed. Considering the adaptive Cartesian grid is non-uniform, a processing method is developed for the hang-grid problem. Meanwhile, a viscous numerical solver applicable to the adaptive Cartesian grid is constructed. Typical simulation examples show the feasibility and reliability of the adaptive Cartesian grid generation methodology and the numerical solver.

Key words: adaptive Cartesian grid, quadtree data structure, immersed boundary method, viscous boundary condition, viscous numerical solver

CLC Number:

V211.3

TANG Zhigong, CHEN Hao, BI Lin, YUAN Xianxu. Numerical simulation of supersonic viscous flow based on adaptive Cartesian grid[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(5): 121697-121697.

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Numerical simulation of supersonic viscous flow based on adaptive Cartesian grid

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