Three-Dimensional Numerical Simulation of Unsteady Flow and Heat Transfer over Blunt Flat Plate in a Channel.

Abstract

Three-dimensional unsteady separated and reattached flow over a blunt flat plate in a channel is analyzed by numerical simulations of Navier-Stokes equations, and the heat transfer characteristics are also numerically clarified. The results of three-dimensional unsteady calculations at low Reynolds number are presented. The flow in the recirculation region is three dimensional and the separated shear layer around the center of the plate becomes unstable. As a result, vortices are periodically shed from the reattachment flow region. Such a vortex exhibits a hairpin-like structure and greatly influences the heat transfer. The horseshoe vortex near the endwall is steady, and the Nusselt number therein is larger than that near the center of the plate.