A Simplified Model for the Interaction Between the Boundary Layer and Longitudinal Vortices : 2nd Report

Abstract

Velocity distributions of a three dimensional turbulent boundary layer, which is a combination of the boundary layer (b.1.) developing on the flat plate and the trailing vortex produced by the swept back wing, are measured. Introducing the induced velocity of the trailing vortex and turbulent eddy viscosity, the b.1. deformation due to the trailing vortex is calculated numerically and is compared with experiments. The results are summarized as : 1) Measured velocity distributions of cross flow components are similar to that of induced velocities by the trailing vortex except the narrow region close to the wall. 2) Calculated velocity distribution of the main flow component is in good agreement to the measured one, and the decrease in velocity in the vortex core is observed. 3) Calculated solution on cross flow velocity components using the finite difference method diverged at the upper part of the vortex core, and the three dimensional b.1. separation line is observed on the plate close to that position.