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ISSN オンライン: 2642-0554

MODELING OF UNSTEADY TURBULENT WALL FLOWS WITH AND WITHOUT ADVERSE PRESSURE GRADIENT BY A k−ω /RAPID

Sedat Tardu
Laboratoire des Ecoulements Geophysiques et Industriels (LEGI) UMR 5519/Universite de Grenoble 38402 Saint mrtin d'heres Cedex France

Paulo Da Costa
Laboratoire des Ecoulements Géophysiques et Industriels (LEGI) BP 53 X 38041 Grenoble-Cédex France

要約

The k−ω model is combined with the rapid distortion scheme to develop effective unsteady closures in non-equilibrium wall flows subjected to oscillating shear. The phase averaged eddy viscosity is related to the modulation of the effective strain parameter whose distribution is obtained by making use of the bench data of either steady turbulent channel or boundary layer flow. The model is free of any assumption concerning the modulation of production nor the dissipation. The results are compared with the experiments in details, including the modulation characteristics of the turbulent wall shear stress intensity. The model predicts the time mean and phase averaged flow quantities in a satisfactory way. The same procedure is applied to a turbulent boundary layer with adverse pressure gradient.