论文部分内容阅读
采用部分平均Navier-Stokes(PANS)方法对超声速斜面空腔流动进行了数值模拟研究,评估其对于超声速非定常湍流模拟的性能,并与雷诺平均N-S(RANS),脱体涡模拟(DES)的计算结果及实验数据进行对比.研究表明:模化湍动能比例全场可变的PANS方法预测的速度、壁面压力和摩擦力系数分布与DES的结果非常接近,都与实验值吻合得较好,优于RANS的计算结果;非定常雷诺平均N-S(URANS)计算的自由剪切层近乎为二维稳态的,而DES和PANS方法可以求解出更为丰富的流动结构;模化湍动能比例全场统一的PANS方法虽然可以求解出相比RANS更多尺度的流动结构,但在近壁区不能回归到RANS模型,预测的湍流边界层的速度型偏离对数律,后续的流动计算也偏离实验数据.
A partial average Navier-Stokes (PANS) method was used to study the numerical simulation of supersonic bevel cavity flow to evaluate its performance for unsteady supersonic turbulence simulation. The results were compared with those of Reynolds averaged NS (RANS), desorbed eddy simulation (DES) The results show that the velocity, wall pressure and friction coefficient predicted by PANS with variable turbulent kinetic energy ratio are very close to the results of DES and all agree well with the experimental data. Which is superior to the results of RANS. The free shear layer calculated by unsteady Reynolds averaged NS (URANS) is almost two-dimensional steady state, while the DES and PANS methods can solve the richer flow structure. The proportion of modeled turbulent kinetic energy Although the unified PANS method can solve the flow structure with more scales than RANS, it can not return to the RANS model in the near wall region, and the predicted velocity turbulent boundary layer velocity logarithm law is lost. The subsequent flow calculation also deviates from the experiment data.