Flow Dynamics Stimulated by Hairpin-Like Vortices in Initially Laminar Boundary Layers

摘要

Time-marching spatial simulations of flow events stimulated by hairpin-like vortices in the near-wall region of initially laminar boundary layers are in progress. The behavior characteristics and the underlying physical mechanisms are being examined by using three distinct but related methods of analysis. The results presented in this report are the kinematic and dynamic states in a plane at a given instant. The spatial distributions of various flow quantities over a cross-section of the streamwise vortex have been examined and interpreted. These quantities are: translational velocity, vorticity, production of vorticity due to straining, viscous diffusion of vorticity, dissipation, static pressure and viscous stress tensor. Such a local, instantaneous analysis forms the basis for a global temporal analysis; its results will be presented in the final report.