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Effects of wall suction/blowing on two-dimensional flow past a confined square cylinder
Wei Zhang1, Yanqun Jiang2, Lang Li3
1School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, 621010 Sichuan People's Republic of China ; Department of Modern Mechanics, University of Science and Technology of China, Hefei, 230027 Anhui People's Republic of China.
Abstract:
A numerical simulation is conducted to study the laminar flow past a square cylinder confined in a channel (the ratio of side length of the square to channel width is fixed at 1/4) subjected to a locally uniform blowing/suction speed placed at the top and bottom channel walls. Governing equations with boundary conditions are resolved using a finite volume method in pressure-velocity formulation. The flow patterns relevant to the critical spacing values are investigated. Numerical results show that wall blowing has a stabilizing effect on the flow, and the corresponding critical Reynolds number increases monotonically with increasing blowing velocity. Remarkably, steady asymmetric solutions and hysteretic mode transitions exist in a certain range of parameters (Reynolds number and suction speed) in the case of suction.
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