论文标题
含冲击的湍流通道计数器的直接数值模拟
Direct numerical simulations of shocklet-containing turbulent channel counter-flows
论文作者
论文摘要
反流或反电流配置可以保持高湍流强度并表现出很大的混合水平。我们先前曾引入壁挂式的反流湍流通道构型（物理审查流体，6（9），p.094603。）作为研究可压缩性对湍流的影响的有效框架。在这里，我们将先前的直接数值模拟研究扩展到相对较高的马赫数（M = 0.7），以研究强可压缩性效应（也通过将PRANDTL数量从PR = 0.7减少到0.7），以及不稳定的冲击物结构的形成和演变。发现该构型能够在扩张的概率密度函数中产生具有嵌入式冲击的高度湍流和明显的不对称性。获得了接近统一的峰值湍流马赫数，但发现扩张耗散对总耗散的贡献被发现限制为6％。
Counter-flow or counter-current configurations can maintain high turbulence intensities and exhibit a significant level of mixing. We have previously introduced a wall-bounded counter-flow turbulent channel configuration (Physical Review Fluids, 6(9), p.094603.) as an efficient framework to study compressibility effects on turbulence. Here, we extend our previous direct numerical simulation study to a relatively higher Mach number (M=0.7) to investigate strong compressibility effects (also by reducing the Prandtl number from Pr=0.7 to 0.2), and the formation and evolution of unsteady shocklet structures. It is found that the configuration is able to produce highly turbulent flows with embedded shocklets and significant asymmetry in probability density functions of dilatation. A peak turbulent Mach number close to unity is obtained, for which the contribution of the dilatational dissipation to total dissipation is nevertheless found to be limited to 6%.
