直接数値シミュレーションによる超音速混合層の大規模構造

概要

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In the present paper, coherent structures of the supersonic mixing layer are investigated by direct numerical simulations of a spatialy developing free shear layer, We examined numerical results of the velocity components, u, v, w simulated by Fouillet and Lesieur : Reynolds number Re=δ_<ω0>ΔU/ν=1500, Mach number =1(M_1=1 and M_c=0.3), (U_1+U_2)/2=0.7, U_1-U_2=0.6, and the hyperbolic-tangent velocity profile is perturbed by weak three-dimensional white noise. We find that the coherent structures in the supersonic mixing layer at M_c=0.3 are three dimensional and have rib structures with strong vorticities of ω_y and ω_x similar to those in the incompressible mixing layer. The helical pairing structures found in the rib structure generate a coherent 'upwash' and 'downwash' fluid motion in the supersonic mixing layer. The regions corresponding to high rates of dissipation are found in the rib structures.
社団法人日本機械学会の論文
1994-06-25