低速修正的可压缩求解器对湍流模拟精度的影响

修正可压缩求解器能提高其对高速湍流中低速区的模拟精度，但低速修正效果受到求解器、计算格式精度、网格量等多因素影响，难以直接评估。研究了不同阶数、分辨率、网格量下，有无低速修正的可压缩求解器对复杂湍流模拟的影响。通过泰勒-格林涡算例，定量分析了不同结果的差异。结果表明:不同网格量、计算方法组合下，低速修正对结果的影响不同。网格量较小、重构格式精度较低的情况下，低速修正方法能够有效提高计算精度。 

Effect of low-speed modification of compressible solver on turbulence simulation accuracy

The calculation accuracy of low-speed region in high speed turbulence can be improved by modifying the compressible solver. However, it is difficult to evaluate the contribution of such modification, because simulation accuracy results from complex factors including solver type, accuracy of schemes, grid number, etc. This paper focuses on the influence of the compressible solver with and without low-speed modification on complex turbulence simulation when using different order or resolution of the schemes and different amount of grid. With the calculation example of Taylor-Green vortex, the differences of the results are evaluated quantitatively. The results show that the influence of the low-speed modification is different with different scheme-grid combinations. The low-speed modification method can effectively improve the calculation accuracy with coarse grids and low-accuracy reconstruction schemes.