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

Franck, Jennifer A. and Colonius, Tim (2010) Compressible Large-Eddy Simulation of Separation Control on a Wall-Mounted Hump. AIAA Journal, 48 (6). pp. 1098-1107. ISSN 0001-1452. http://resolver.caltech.edu/CaltechAUTHORS:20100623-152555163

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.2514/1.44756 DOIArticle
ORCID:
AuthorORCID
Colonius, Tim0000-0003-0326-3909
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.
Funders:
Funding AgencyGrant Number
NSF Graduate Research FellowshipUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)FA9550-05-1-0369
Record Number:CaltechAUTHORS:20100623-152555163
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100623-152555163
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18779
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Jul 2010 16:37
Last Modified:07 Oct 2017 04:35

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