DOI: 10.1615/TSFP10
LARGE EDDY SIMULATION OF TURBULENT FLOW OVER A WALL UNDERGOING STREAMWISE TRAVELLING WAVE MOTION
SINOPSIS
Turbulent channel flow with a wall undergoing travelling wave motion in streamwise direction was investigated using large eddy simulations at friction Reynolds number Re*>1000. Phase average and decomposition were used in the analysis of the flow field. Compared to flat wall turbulence, the large-scale motions in the outer layer are significantly enhanced by the traveling wave boundary. Obvious large-scale peaks in outer layer for all the three velocity components could be observed in the spanwise pre-multiplied energy spectra. A strengthened superposition effect of streamwise velocity fluctuation could also be seen in both energy spectra and conditionally averaged flow fields. The analysis of the two-point correlation function transport equation shows that the wave motion of the wall taking effect on the largescale motion in the outer layer is mainly through the wave-induced production.