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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

FLOW STRUCTURES DUE TO STATIC AND OSCILLATING DIMPLES IN CHANNEL FLOWS

pages 635-640
DOI: 10.1615/TSFP6.1020
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SINOPSIS

Flow structures due to static and oscillating dimple in a channel are studied by direct numerical simulation. Coordinate transform are employed to account for the timedependent complex wall deformation. The governing equations are solved in the computational space by Fourier-Chebyshev spectral method and third-order time splitting method. Three Reynolds numbers, i.e. Re=500, 1000, 1900, and two oscillating frequencies of f=0.5 and 2 are considered. With the increase of the Re, vortical structures can be generated by the static dimple. At Re=500, periodic shedding of vortices can be observed at both frequency. At Re=1900, no significant interaction between moving dimple and outside turbulence can be found at f=0.5. By increasing the frequency of dimple oscillation to f=2, the influence of the moving dimple on outside turbulent flow can be observed.

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