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为研究可压缩混合层中的输运特性 ,该文采用气动BGK格式模拟了超音速来流条件下的二维平面可压缩混合层的空间发展 ,给出了湍能、雷诺应力和动量输运方程中各项的分布情况。各平衡方程中粘性耗散项和粘性扩散项都很小。湍能主要是通过对流、湍流扩散和压力扩散进行输运 ;切应力输运方程中主要是生成项与压力扩散项和压力 -应变关联项的平衡 ;雷诺应力 (1,1)分量输运方程中以生成项和压力 -应变关联项为主 ;雷诺应力 (2 ,2 )分量输运方程中主要是压力 -应变关联项与湍流扩散项和压力扩散项之间的平衡。
In order to study the transport characteristics in a compressible mixed layer, the aerodynamic BGK format is used to simulate the spatial evolution of a two-dimensional compressible composite layer under supersonic flow conditions. The turbulence, Reynolds stress and momentum transport The distribution of the items in the equation. The balance of viscous and viscous diffusion terms are small. The turbulent energy is mainly transported by convection, turbulent diffusion and pressure diffusion. The shear stress transport equation is mainly the balance between the generated term and the pressure diffusivity and pressure-strain. The Reynolds stress (1,1) component transport equation In the Reynolds stress (2, 2) component transport equation, it is mainly the balance between the pressure-strain correlation term and the turbulent diffusion term and pressure divergence term.