Abstract:
Large eddy simulation (LES) is used to predict flow filedin fully developed turbulent channel flow rotating along spanwise axis atsix different angular velocities. Statistically-averaged streamwise velocityprofile consists well with available experimental data near the wall. Thephenomena that turbulence and wall friction are enhanced near pressure sideand depressed near suction side are recovered. Explanation for theevolvement of lower order turbulence correlations is consistent with theanalysis of the transport equation for each turbulence stress component. Thebursting and the shape of near wall streak are also affected by rotationalforces, resulting in variation of wall friction velocity. Furthermore,velocity distribution in streamwise cross section indicates that Coriolisforce induces secondary flow normal to the wall. Such secondary flowgenerates counter rotating vortex pairs in streamwise, which shift towardspressure side as the rotating velocity increases. The results with lowcomputational cost agree with available conclusion, implying possibleapplication of LES for engineering usage.
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