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RELATIONSHIP BETWEEN WALL PRESSURE FLUCTUATIONS AND STREAMWISE VORTICITY IN A TURBULENT BOUNDARY LAYER

Joongnyon Kim
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology Gusong-dong, Yusong-gu, Daejon 305-701, Korea

Jung-ll Choi
Dept. of Computational Science and Engineering Yonsei University Seoul, 120-749, Korea

Hyung Jin Sung
Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea

Abstrakt

A direct numerical simulation is performed to obtain the correlation between wall pressure fluctuations and streamwise vorticities in a spatially-developing turbulent boundary layer. It is shown that wall pressure fluctuations are related with the upstream streamwise vortices in the buffer region. The maximum correlation occurs with the spanwise displacement from the location of wall pressure fluctuations. The conditionally-averaged vorticity field and the quadrant analysis of Reynolds shear stress indicate that positive wall pressure fluctuations are correlated with the sweep events due to streamwise vortices, while negative wall pressure fluctuations are created beneath the ejection events and vortex cores.