Computation of high Reynolds number flow around a circular cylinder with surface roughness

摘要: Incompressible high-Reynolds-number flows around a circular cylinder are analyzed by direct integration of the Navier-Stokes equations using finite-difference method. A generalized coordinate system is used so that sufficient number grid points distributed in boundary layer and wake. numerical scheme which suppresses non-linear instability for calculations developed. The computation an impulsively started flow at Re = 1200 compared with corresponding experimental observations, excellent agreements obtained. series computations carried out on surface roughness. height roughness these 0.5% diameter. range Reynolds numbers from 103 to 105; no turbulence model employed. Sharp reduction drag coefficient observed near 2 ? 104, indicates critical captured present computation.