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Published June 2010 | Published
Journal Article Open

Compressible Large-Eddy Simulation of Separation Control on a Wall-Mounted Hump

Abstract

Compressible large-eddy simulations of turbulent flow over a wall-mounted hump with active flow control are performed and compared with previous experiments. The flow is characterized by the unsteady separation before the steep trailing edge, which naturally reattaches downstream of the hump to form an unsteady turbulent separation bubble. The low Mach number large-eddy simulation demonstrated a good prediction of surface pressure coefficient, separation-bubble length, and velocity profiles compared with experiments. The effect of compressibility on the baseline flow is documented and analyzed and is found to increase the separation-bubble size, due to a reduced growth rate. Control is applied just before the natural separation point via steady suction and zero-net-mass-flux oscillatory forcing, and steady suction is shown to be more effective in decreasing the size of the separation bubble and pressure drag for the control parameters investigated. Controlled flow at a compressible subsonic Mach number is applied, and found to be slightly less effective than the same control parameters at low Mach numbers.

Additional Information

© 2010 by Jennifer A. Franck and Tim Colonius. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Presented as Paper 555 at the 46th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, 7–10 January 2008; received 5 April 2009; revision received 22 February 2010; accepted for publication 26 February 2010. This work was supported by a National Science Foundation graduate student fellowship and U.S. Air Force Office of Scientific Research grant FA9550-05-1-0369. Computational resources were provided by the Department of Defense High Performance Computing Centers.

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August 19, 2023
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