摘要
采用一种改进的Ｒｏｅ格式对平面叶栅的无粘流动进行了数值模拟，并与Ｒｏｅ格式的计算结果进行了比较。采用四阶Ｒｕｎｇｅ－Ｋｕｔａ时间差分格式，空间三阶有限体积法。网格生成采用贴体网格近壁面修正的方法。计算结果表明，该格式在减少格式对网格的依赖性，抑制数值粘性方面具有明显的作用。
In two-or three-dimensional flow fields,it is difficult to determine the direction of wave propagation in cascades due to complexity of transonic flow.Now a grid-independent approximate Riemann solver is applied to numerical simulation of two-dimensional transonic cascade flow by the Euler or Navier-Stokes equations.Fluxes on grid faces are obtained via wave decomposition,assuming that information propagates in the velocity difference directions,rather than in the grid-normal directions as in a standard grid-aligned solver.Second-order computations with the grid-independent flux function are used to analyze two typical examples of transonic cascades.The results indicate that the grid-independent model suppresses entropy production over the cascade surface due to either computational diffusion or grid viscosity,and resolves shock and shear waves in transonic flow of cascades much better.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
1998年第1期19-22,共4页
Journal of Aerospace Power
