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Large eddy simulation of flow control around a cube subjected to momentum injection

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.950
pages 891-901

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

The concept of Momentum Injection (MI) through Moving Surface Boundary-layer Control (MSBC) applied to a cubic structure is numerically studied using large eddy simulation at a Reynolds number of 6.7 × 104. Two small rotating cylinders are used to add the momentum at the front vertical edges of the cube. Two configurations are studied with yaw angles of 0° and 30°, respectively, with a ratio of the rotation velocity of cylinders and a freestream velocity of 2. The results suggest that MI delays the boundary layer separation and reattachment and thus reduces the drag. A drag reduction of about 6.2% is observed in the 0° yaw angle case and about 45.3% reduction in the 30° yaw angle case. In the case of 0° yaw angle, the main change of the flow field is the disappearance of the separation regions near the rotating cylinders, and the wake region is slightly changed due to MI. In the 30° yaw angle case, the flow field is changed a great deal. Large flow separations near one rotating cylinder and in the wake are significantly reduced, which results in the large drag reduction. Meanwhile, the yaw moment is increased about 44.7%.

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