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LARGE EDDY SIMULATION OF TURBULENT FLOW OVER A WALL UNDERGOING STREAMWISE TRAVELLING WAVE MOTION

Wuyang Zhang
Department of Engineering Mechanics Tsinghua University Beijing 100084, PR China

Weixi Huang
Department of Engineering Mechanics Tsinghua University Beijing 100084, PR China

Chunxiao Xu
Department of Engineering Mechanics Tsinghua University Beijing 100084, PR China

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.