Numerical Simulation of the Interaction of Unsteady Surface Blowing (Suction) with Turbulent Near-Wall Flow

Abstract

The dynamic and thermal characteristics of unsteady near-wall flows are investigated numerically on the basis of two-parameter turbulence models under the conditions of high-turbulence free stream and the impact of disturbing blowing (suction) factors in the boundary layer through a permeable surface section. The mutual effect of time harmonic oscillations of the external inviscid stream velocity and the blowing flow rate density on the wall on the development of time-dependent heatand mass-transfer processes in turbulent flow is analyzed. The laws of variation in the flow and heattransfer properties are established when the flow rate density is given to be variable in time and constant. The basic mechanisms of the impact of blowing and suction on the permeable section and downstream are studied by comparing the calculated results.