AM06-22-002 オリフィスを有する流路の乱流DNS(乱流の予測とモデリング(1),一般講演)

概要

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Direct numerical simulation of a turbulent channel flow with an orifice has been performed for Re_<Τ0>(=μ_<Τ0>δ/ν)=10-600, where μ_<Τ0> is the friction velocity calculated from the mean pressure gradient, δ the channel half width and ν the kinematic viscosity. In the wake region, the mean flow becomes asymmetri by the Coanda effect. Large-scale vortices are generated at the height of the orifice edges. This large-scale vortices become deformed and break up into disordered small-scale structures in the shear layers behind the orifice. The small-scale vortices are convected toward the center of the channel. The turbulent kinetic energy and the Reynolds stresses increase in the free shear layers. In addition, we classify the wake region based upon the budgets of the Reynolds stresses.
日本流体力学会の論文
2006-09-05