波状壁流路における安定成層乱流のラージエディシミュレーション（サブグリッドスケールモデルの格子依存性と乱れの輸送機構に関する検討）

概要

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Large eddy simulation (LES) was performed for a stably stratified turbulent flow in a wavy wall channel. The numerical results at four grid resolutions were compared with existing data of experiments and direct numerical simulations, and revealed that the grid dependency of a subgrid-scale model in the stably stratified flow is quite larger than that in neutral flow. Flow becoming stably stratified, the flow pattern and the instantaneous turbulent structures near the wavy surface do not markedly change, whereas the turbulence intensity considerably decreases between the wavy surface and the center of the channel. The budgets of turbulent energy and Reynolds stresses suggest that energy transports between Reynolds normal stresses are activated far from the wavy surface, and spatial transports of turbulence are suppressed near the surface under stable stratification.