Fluid-Structure-Sound Interactions and Control pp 173-178 | Cite as
Intermittency of Vortex Shedding in the Near Wake of a Finite-Length Square Prism
Abstract
The flow around a finite-length square prism with aspect ratio of 5 is investigated using LES at Re d = 3,900. Two typical flow modes are found in its near wake. One is characterized by staggered arranged spanwise vortices, similar to that in 2D cylinder wake; on the other hand, the spanwise vortices are symmetrically arranged for the second mode. These two modes occur intermittently in the near wake. When the first mode occurs, the pressure on prism side surface fluctuates periodically, corresponding to large values of drag and fluctuating lift; for the second mode, there is no obvious pressure fluctuation, and the drag and fluctuation lift are significantly smaller than those for the first mode.
Keywords
Finite-length prism Wake Aerodynamic force LESReferences
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