关键词: 非结构网格, 旋转Riemann求解器, 欧拉方程, Riemann求解器, 多维格式, 激波捕捉, "红斑"现象

Abstract: A second-order rotational upwind transport scheme for multidimensionul compressible Euler equations on unstructured meshes is presented. Cell-centered FVM is employed in which gradient calculation is node-based with more neighbor cells. Slope limiter schemes are constructed for unstructured meshes. Numerical fluxes are evaluated by solving two Riemann problems in two upwind directions, including velocity-difference vector and perpendicular direction. The scheme eliminate shock instabilities or carbuncle phenomena in flux-difference splitting type schemes completely. A hybrid rotated Riemann solver is employed to form an economical numeric flux function and base Riemann solvers employ HLL and Roe FDS.

Key words: unstructured grid, hybrid rotated Riemann solver, Euler equation, Riemann solver, multi-dimensional scheme, shock capture, carbuncle phenomena