1302 直接数値シミュレーションによる圧縮性溝乱流場の構造解析(GS-5 数値流体力学と乱流(1))

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 nearwall region, typical turbulence structure, such as streaky structure and coherent vortices are observed similar to the incompressible turbulent flow. However, quantitatively the number or length scale of vortices is distinct from incompressible case. A conditional sampling technique is applied to study the flow field surrounding the strong down-wash events. The diltation dissipation denoting compressiblity effect is fairly small around vortices, the solenoidal dissipation due to the vortex itself is crucial even in this compressible flow.
一般社団法人日本機械学会の論文
2001-03-16