Numerical Analysis of Interactions and Heat Transfer between Asymmetric Hairpin Vortices in the Wakes behind a Staggered Array of Asymmetric Hills

Abstract

The present study performs three-dimensional numerical analysis on the heat transfer and the interactions between asymmetric hairpin vortices formed behind asymmetric hills which are arrayed alternately in a laminar boundary layer. Asymmetric hairpin vortices are periodically shed in the wakes formed behind hills, these vortices interact, and a high turbulent kinetic energy region is formed widely. As the shape of hills increases in asymmetry with respect to the spanwise direction, the high turbulence region further spreads. However, the rotation of the vortices is weakened, and the spatially averaged turbulence decreases. So, the heat transport is also weakened, the heat transfer rate decreases.