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Numerical investigation of passive flow control around a D-shaped bluff body

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.940
pages 881-890

Xingsi Han
Division of Fluid Dynamics, Department of Applied Mechanics, Chalmers University of Technology, 412 96 Gothenburg, Sweden

Sinisa Krajnovic
Department of Mechanics and Maritime Sciences (M2), Chalmers University of Technology, Goteborg 41296, Sweden

Sinopsis

A passive flow control around a two-dimensional D-shaped bluff body is studied at a Reynolds number of 13 000 using Large Eddy Simulation with the Coherent Structure Model (CSM). A small circular control cylinder located in the near wake region behind the bluff body is employed as a local disturbance of the shear layer and the wake. Numerical results are compared in detail with experimental data, including global flow parameters of the drag coefficient and mean and RMS velocities. The predictions suggest that the bubble recirculation length is significantly increased by the local disturbance of the small cylinder. A drag reduction of about 27.6% is observed in the numerical simulation. The small control cylinder was found to split the shear layer detached from the main bluff body and result in a flow structure like a jet, which inflates the formation of the wake region behind the main bluff body.

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