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Numerical Simulations of Unsteady Wakes Using a Discrete Vortex Method
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 Title & Authors
Numerical Simulations of Unsteady Wakes Using a Discrete Vortex Method
Han, Cheol-Hui; Choe, Geun-Hyeong; Jo, Jin-Su;
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The behavior of unsteady wake vortices for the two-dimensional flat plate is simulated by a discrete vortex method. The flat plates and their wakes are represented by vortex sheets. The vortex sheets are replaced with discrete vortices. The freely deforming wake sheets are computed as a part of solution and the ground effect is included by a image method. In order to predict wake shapes accurately and to model closely coupled aerodynamic interference, a vortex core model and a vortex core addition scheme are used. The simulated wake shapes convecting behind the plates in unsteady motion are compared to a flow visualization result and other numerical results. The present results agree well with them. The present method is also applied to the aerodynamic analysis of flat plates in tandem configuration in ground effect.
Unsteady Wakes;Discrete Vortex Method;Ground Effect;
 Cited by
Sarpaka, T., 1989, 'Computational Methods With Vortices-The 1988 Freeman Scholar Lecture, ' Journal of Fluids Engineering, Vol. 111, pp. 5-52

Rosenhead, L., 1931, 'The Formation of Vortices from a Surface of Discontinuity,' Proc. R. Soc. Lond., A 134, p. 170 crossref(new window)

Krasny, R., 1986, 'A Study of Singularity Formation in a Vortex Sheet by the Point-Vortex Approximation,' Journal of Fluid Mechanics, Vol. 167, pp. 65-93 crossref(new window)

Mook, D. T., Roy, S., Choksi, G. and Dong, B., 1989, 'Numerical Simulation of the Unsteady Wake Behind an Airfoil,' Journal of Aircraft, Vol. 26, No. 6, pp. 509-514

Ling, G. C. et al., 1986, 'A Further Simulation of Starting Flow around a Flat Plate by a Discrete Vortex Model,' Internal Seminar on Engineering Applications of the Surface and Cloud Vorticity Methods, Wroclaw, Poland, Vol. 51, No. 14, pp.118-138

Kono, T. et al, 1994, 'Stability of Guide Way Type Wing in Ground Effect Vehicle,' Proceedings of the Third JSME-KSME Fluids Engineering Conference, pp. 715-718

Hiemcke, C., 1997, 'NACA 5312 in Ground Effect : Wind Tunnel and Panel Code Studies,' AIAA-97-2320, pp. 829-838

Nuhait, A. O. and Zedan, M. F., 1993, 'Numerical simulation of Unsteady Flow Induced by a Flat Plate Moving near Ground,' Journal of Aircraft, Vol. 30, No. 5, Sept.-Oct., pp. 611-617

Katz, J., 1991. Low-Speed Aerodynamics, McGraw-Hill, Inc

Ogawa, A., 1940, Vortex Flow-CRC Series on Fine Particle Science and Technology, CRC Press

Bratt, J. B., 1953, 'Flow Patterns in the Wake of an Oscillating Airfoil,' Aeronautical Research Council, R&M2773