A Large-Eddy Simulation of the Near Wake of a Circular Cylinder

[+] Author and Article Information
S. A. Jordan

Naval Undersea Warfare Center, Newport, RI 02841

S. A. Ragab

Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

J. Fluids Eng 120(2), 243-252 (Jun 01, 1998) (10 pages) doi:10.1115/1.2820640 History: Received February 14, 1997; Revised March 02, 1998; Online December 04, 2007


The formation and the downstream transport of the Strouhal vortices in the near wake of a circular cylinder are investigated using the large-eddy simulation (LES) method. The governing equations are formulated in curvilinear coordinates to accommodate a nonorthogonal grid with formal development of a dynamic model to account for the subgrid turbulent scales. Results were produced with and without use of the model. The focus of the investigation is at a subcritical Reynolds number of 5600. Using the dynamic model, the LES results compared best to the published experimental data in terms of both the global and local wake characteristics such as the drag and base pressure coefficients, shedding and detection frequencies, peak vorticity, and the downstream mean velocity-defect and Reynolds stresses. The results further showed streamwise filaments that connect subsequent Strouhal vortices. Qualitatively, the time-averaged Reynolds stresses of the formation region revealed similar symmetric characteristics over the range 525 ≤ Re ≤ 140,000.

Copyright © 1998 by The American Society of Mechanical Engineers
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