Navier-Stokes simulations of the effects of suction holes on a flat plate boundary layer

摘要: Direct numerical simulations (DNS) of the Navier-Stokes equations are employed to explore effects suction holes on transition in a laminar flat plate boundary layer. The cast vorticity-velocity form. Periodicity is imposed spanwise direction; all other spatial derivatives discretized with fourth order compact differences. An explicit Runge-Kutta scheme for time-integration vorticity transport equations. Suction applied through row aligned direction. For low strengths, each hole generates pair stable streamwise vortices. When strength exceeds critical value, vortices become unstable. high vortex shedding occurs right at holes. Our findings agree well experimental observations.