WANG Hanfeng, XU Mengxia. BISTABLE PHENOMENON OF THE FLOW AROUND A FINITE-LENGTH SQUARE PRISM[J]. MECHANICS IN ENGINEERING, 2013, 35(3): 46-50. DOI: 10.6052/1000-0879-13-100
Citation: WANG Hanfeng, XU Mengxia. BISTABLE PHENOMENON OF THE FLOW AROUND A FINITE-LENGTH SQUARE PRISM[J]. MECHANICS IN ENGINEERING, 2013, 35(3): 46-50. DOI: 10.6052/1000-0879-13-100

BISTABLE PHENOMENON OF THE FLOW AROUND A FINITE-LENGTH SQUARE PRISM

  • The flow around a finite-length square prism is numerically investigated using the LES (large eddy simulation). The aspect ratio of the prism is 5. The prism is mounted on a flat wall, with one end free. The thickness of the boundary layer on the flat wall is very small to be negligible. The Reynolds number based on the free-stream oncoming velocity and the prism width is 3 900. Based on the simulation results, it is found that the near wake is highly three dimensional under the effects of the free-end downwash flow. Two typical flow states were observed in the near wake: first, the spanwise vortices are staggered arranged similar to the Karman vortex street; second, the spanwise vortices are quasi-symmetrically arranged without obvious periodicity. These two typical states occur alternately, which affects the aerodynamic forces on the prism.
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