Abstract
AbstractThe flow characteristics of the vortex shedding system behind two cylinders that have a crescent cross-section, were numerically studied using a lattice Boltzmann approach. Two configurations ate considered, in one the crescent is facing the flow and in the other facing the flow downstream. The system of vortices formed behind the crescent cylinders was compared to the classical case of a circular cylinder for the same geometrical, physical and dynamic conditions at varying Reynolds numbers. The flow properties from all three cases studied have revealed that the crescent shape affects strongly the shedding mechanism. The numerical results showed that the flow past the crescent facing downstream of the flow was very similar to that of the circular cylinder, whereas there were remarkable differences when compared to the crescent cylinder facing the flow upstream.
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