DISTURBANCE EVOLUTION IN COMPRESSIBLE BOUNDARY LAYER

摘要

Spatial development of disturbance produced from a harmonic point source in compressible boundary layer around a flat plate is simulated for a Mach number of 1.5 by solving the three-dimensional compressible Navier-Stokes equations. A fourth order non-oscillatory scheme and Roe's approximate Riemann solver are utilized for space discretization, and the third-order Runge-Kutta scheme for time integration. The disturbance produced from a source in the upstream spreads in both streamwise and spanwise directions. The wall temperature was varied to examine the effects of wall cooling on the development of disturbance. It turned out that propagation of disturbance takes a wedge-like shape behind the flow source from the wall. The wedge angle and the magnitude of streamwise velocity fluctuation are increased by cooling wall. Furthermore, the lateral spreading angle is close to that of experimental data.