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对SST湍流模型进行了改进,并通过对典型分离流动进行数值模拟,来检验和提高模型预测分离流动的能力。基于亚声速分离流动,提出了提高雷诺应力的模拟精度和分离流修正的改进方法,并进行了对比研究得出结论;在亚声速分离流动分析结论基础上,采用了可压缩性修正方法,开展了跨声速、超声速和高超声速激波/边界层干扰分离流动的数值模拟研究。结果表明:提高雷诺应力的模拟精度和采用分离流修正明显地提高了SST湍流模型对分离流动的模拟能力;适当地可压缩性修正对超声速和高超声速分离流动的计算精度有改善作用。
The SST turbulence model is improved, and the ability of the model to predict the flow of separation is verified and improved through the numerical simulation of the typical separation flow. Based on the sub-sonic separation flow, an improved method to improve the simulation accuracy of the Reynolds stress and the correction of the separation flow is put forward, and the conclusion is drawn from the comparative studies. Based on the results of subsonic separation flow analysis, a compressibility correction method A numerical simulation of the separation of transonic, hypersonic and hypersonic shock / boundary-layer disturbances is presented. The results show that improving the simulation accuracy of Reynolds stress and using the correction of the separation flow can obviously improve the simulation ability of the SST turbulence model for the separation flow. Appropriate compressibility correction can improve the calculation accuracy of the supersonic and supersonic separation flow.