Simulation of the effect of high-intensity turbulence flow parameters on unsteady boundary layers with streamwise pressure gradients

Abstract

The dynamic and thermal characteristics of steady and unsteady wall boundary layers are investigated on the basis of the two-parameter turbulence model under conditions of high-intensity free-stream turbulence and exposure to a negative streamwise pressure gradient. Flows from the laminar to the completely developed turbulent regimes, including the transition regime, are calculated. The possibility of the theoretical description of the transition and the developed turbulent regime by means of a quasi-steady-state turbulence model when the free-stream velocity distributions are time-periodic is demonstrated. The properties of the calculated characteristics of the dynamic and thermal boundary layers are analyzed for various oscillation parameters and a moderate steamwise pressure gradient. The numerical results are compared with experimental and theoretical data.