论文部分内容阅读
为模拟高速可压缩湍流问题,对剪应力输运(SST)湍流模型进行了可压缩修正。数值格式采用改进的总变差减小(TVD)格式,并对湍流模型的负值强制项进行了隠式处理。在此基础上计算了绕平板以及基本无分离和具有分离流动结构的压缩拐角的高超声速流动。计算结果和实验数据及半经验公式的对比表明:SST湍流模型的可压缩影响项为密度加权脉动速度的平均与压力梯度的标量乘积。经可压缩修正后的SST湍流模型与原模型及其它可压缩修正模型相比,所计算的壁面压力、摩擦阻力和壁面热流分布具有更高的精度。
To simulate high-speed compressible turbulence problems, a compressible correction of shear stress transport (SST) turbulence model was performed. The numerical format uses the Modified Total Variation Reduction (TVD) format, and the negative imposition of the turbulence model has been modeled. Based on this, hypersonic flows around the slab and compression corners with essentially no separation and with separate flow structures were calculated. The comparison of the calculated results with the experimental data and the semi-empirical formula shows that the compressible influence term of the SST turbulence model is the scalar product of the average density-weighted pulsation velocity and the pressure gradient. Compared with the original model and other compressible correction models, the compressible corrected SST turbulence model has higher accuracy of the calculated wall pressure, frictional resistance and wall heat flow distribution.