求解高雷诺数Navier–Stokes方程CCWENO型高阶熵稳定格式

A CCWENO–Type High–Order Entropy Stable Scheme for Navier–Stokes Equations at High Reynolds Numbers

  • 摘要: 针对高雷诺(Re)数可压缩Navier–Stokes(N–S)方程数值求解时易产生振荡问题,本文构造了高阶紧致中心加权基本无振荡(CCWENO)型熵稳定格式。该格式空间方向上将高阶熵守恒通量与耗散项中熵变量的CCWENO型重构结合,构造出高阶熵稳定通量;对热流项和黏性项采用中心格式离散以达到低耗散效果,进而构造出高阶数值通量。采用逐维推广的方法,将该格式成功推广到多维情形,并证明了重构后的高阶数值格式满足熵稳定性质。数值结果表明该格式对高Re数N–S方程可以准确捕捉间断,分辨率高,数值稳定性强。

     

    Abstract: In view of the oscillation problem that easily occurs during the numerical solution of the compressible Navier–Stokes (N–S) equations at high Reynolds (Re) numbers, this paper constructs a high–order Compact Central Weighted Essentially Non–Oscillatory(CCWENO) type entropy–stable scheme. In the spatial direction, this scheme combines the high – order entropy – conservative flux with the CCWENO – type reconstruction of the entropy variable in the dissipation term to construct the high – order entropy – stable flux. For the heat flux term and the viscous term, a central scheme is adopted for discretization to achieve a low – dissipation effect, thus constructing the high–order numerical flux. Using the method of dimension–by–dimension extension, the scheme was successfully extended to the multi–dimensional case, and it was proven that the reconstructed high–order numerical scheme satisfies the entropy stability property. The good performance of the algorithm is verified through several numerical examples. The numerical results show that this scheme can accurately capture discontinuities, has high resolution and strong numerical stability for the N–S equations at high Re numbers.

     

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