Fundamental studies on the control of turbulent boundary layers. Computation of effects on the characteristics of boundary layers, pressure decrease near the entrance convex curvature passage, and adverse pressure gradient along the convex curvature surface.

Abstract

A Simple type (Model 2) of the turbulent stress model developed by Launder, Reece and Rodi is adopted changing to a high-Reynolds-number turbulence model, to estimate the accelerated effects for double conditions: convex curvature, and adverse pressure gradient. To evaluate the accuracies of the model and the numerical computation method, the velocity profiles, turbulent stress profiles and quantities of turbulent energy production terms are calculated, and compared with the experimental values for CASE IIP. The condition CASE IIP consists of two conditions: convex curvature radius R=500mm, and weak adverse pressure gradient dcp/dx=0.2674(1/m). As a result, it is clarified that the effects of the double conditions are more accelerated than the total of the individual effects, and the boundary layers on the convex surface are highly developed.