Large eddy simulation of flow control around a cube subjected to momentum injection
Paper in proceedings, 2012

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 num- ber 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 the yaw angle of 0◦ and 30◦ , respectively, with ratio of the rotation velocity of cylinders and the 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 lot. Large flow separations near one rotating cylinder and in the wake is significantly reduced, which results in the large drag reduction. Meanwhile, the yaw moment is increased about 44.7%.

Author

Xingsi Han

Chalmers, Applied Mechanics, Fluid Dynamics

Sinisa Krajnovic

Chalmers, Applied Mechanics, Fluid Dynamics

7th International Symposium on Turbulence, Heat and Mass Transfer, 24-27 Sep. 2012, Palermo, Sicily, Italy

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Sustainable development

Areas of Advance

Transport

Energy

Roots

Basic sciences

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

Subject Categories

Vehicle Engineering

Fluid Mechanics and Acoustics