Numerical Simulation Of Flow Around Two Prisms In Tandem Arrangement At High Reynolds Numbers

Cross flow around one and two square cylinders are numerically simulatedusing finite volume method on different conditions. Flow patterns, lift and dragcoefficients, and vortex shedding frequencies are mainly investigated. Furthermore,the suppression to the fluid forces acting on two square prisms by a thin flat plateplated in front of the prisms is further discussed. The full contents include three mainparts:Firstly, flow around a square cylinder at Reynolds number of5×103,2.2×104,2×105are two and three-dimensional numerical simulated. Compared with previousexperimental and numerical simulation data, the present analysis results show thatthree-dimensional numerical simulation is better than two-dimensional numericalsimulation, and the DES model is acceptable in three-dimensional simulation of flowaround bluff bodies. Also, the changing trends of the mean value of CDand Stnumber with the increase of Reynolds numbers are analyzed.Secondly, a three-dimensional numerical study on flow around two squareprisms in tandem with various spacing ratios at Reynolds number of2.7×103and5.6×104is presented in this section. the present analysis results show that LESmodel is acceptable for three-dimensional simulation of flow around bluff bodies athigher Reynolds Number. And successfully captured the bistable flow pattern whichis difficult to capture.Lastly, numerical study on flow around square prisms in tandem with differentspacing ratios with a thin flat plate plated at the front of the prisms is studied atReynolds number of5.6×104. The influence of the spacing ratios and the upstreamprism to the flow field was studied. And the characteristics of the flow field and liftand drag coefficients are analyzed.