安定密度成層下における平板ポアスイユ流における直接数値シミュレーション

抄録

We performed direct numerical simulations of a spectral method of a plane Poiseuille flow under stable stratification. The friction Reynolds number is Re_τ = u_τδ/ν = 1000 and Prandtl number is Pr = ν/α = 0.71 , where u_τ , δ , ν , and α are friction velocity, the channel half width, the kinetic viscosity and thermal diffusivity, respectively. The Grashof number was systematically increased. From the calculation results, we could observe the attenuation of turbulent. In the channel center, the mean velocity was increased because of the attenuation of large scale turbulent by stable stratification.