DNS of Point-Source Induced Transition in an Airfoil Boundary-Layer Flow

摘要: Laminar-turbulent transition induced by a harmonic point source disturbance in flat-plate boundary layer with adverse pressure gradient is investigated spatial Direct Numerical Simulation (DNS) based on the complete three-dimensional Navier—Stokes equations for incompressible flow. A local introduced into two-dimensional (2-D) base flow at wall source. Thus Tollmien—Schlichting waves of single frequency and large number obliqueness angles are stimulated propagate downstream simultaneously, undergoing amplification primary subsequent instabilities, eventually lead to breakdown laminar The development wave train spectral amplitude evolution vorticity/shearlayer dynamics. computational aspects this LAMTUR project discussed detail runs NEC SX-4 CRAY T3E supercomputers.