B215 直接シミュレーションによる圧縮性溝乱流場における乱流構造解析

概要

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To investigate the effect of comprssibelity on near-wall turblent structures, direct numerical simulation (DNS) is conducted for a supersonic wall-bounded channel flow. Mach number defined as bulk mean velocity and sound speed at the wall, is 1.5. In the near-wall region, typical turbulence structure, such as streaky structure and coherent vortices are observed similar to that of incompressible turbulent flow. However, the number of vortices decreases compared to the incompressible case. Investigating the generation of vortices based on the production rate of vortices, baroclinic troque which repersents compressible effect works to reduce the vortices closer to the wall. Thus this mechanism mainly contribute to the decrease of vortices and cause the drag reduction commonly found in compressible flow. Although the scale of event concerning to the wall-shear stress slightly is changed, the dynamics is not modified qualitatively.
日本流体力学会の論文
2001-07-31