C134 レイノルズ平均乱流モデルに基づく壁面境界条件の LES への適用

概要

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Some wall models have been applied to decrease a calculation time for LES. These methods calculate accurately a wall shear stress by wall model, instead of resolving a mechanics occurring near wall as precisely as LES by No-Slip boundary condition. There have been two wall models, the one is the standard logarithmic law (WM1) and the other is to solve the boundary layer equation (WM2). WM1 holds well in zero pressure gradient boundary layer, so that it is impossible to apply WM1 to adverse pressure gradient boundary layer. But WM2 involves the pressure effect explicitly. We calculate channel flow and adverse pressure e gradient boundary layer. In channel flow, although the number of grid points used in WM1 and WM2 was about half as one in No-Slip boundary condition, they proved to get better result in a stream wise mean velocity. In adverse pressure gradient boundary layer. WM2 predicts more successfully a wall shear stress than WM1.
日本流体力学会の論文
2000-07-25