Help with: Vortex Shedding at Re~30000 in 2D?

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 December 8, 2005, 12:14 Help with: Vortex Shedding at Re~30000 in 2D? #1 Gerd Guest   Posts: n/a Hello, I try to simulate the vortex shedding frequency at a bluff body in a rectangular duct.I use the RSM Model with Enhanced Wall Treatment, PISO, Second order upwind and defined some vertixes around the bluff body, where I let me show the dynamic pressure (vertex average). In the insteady simulation i used about 20 Time Steps/expected period. With these settings I cant observe a periodic pressure characteristic. Does anyone know how to make the simulation show me the frequency? If anyone knows an Article, where the procedure for a similar problem is described it would help me a lot. It would be very helpful to know, where I can see the periodic pressure course and how high I can expect the amplitude to be. Best Regards Gerd Sattler

 December 21, 2005, 19:37 Re: Help with: Vortex Shedding at Re~30000 in 2D? #2 Ianina Guest   Posts: n/a Hi Gerd, where is the body positioned within the channel and what kind of body it is? There are some cases at which vortex shedding is suppresed at some degree (for example squar cyllinder in the proximity of a wall at a special size of a gap, or 3-dimensional very flat piramids mounted at a wall). If it is relevant for you I can provide you with some links. Regards Ianina

 December 23, 2005, 07:43 Re: Help with: Vortex Shedding at Re~30000 in 2D? #3 Gerd Guest   Posts: n/a Hello Ianina, thanks for ur Mail It is a kind of triangular bluff body with the flat side in the direction of the inlet. Would be nice if u send me the links u have. So that I can decide which papers are relevant for my problem. I wish u a happy Christmas, Kind Regards Gerd Sattler

 December 27, 2005, 08:14 Re: Help with: Vortex Shedding at Re~30000 in 2D? #4 Ianina Guest   Posts: n/a Hi Gerd, some articles/links: 1. About suppression of vortex shedding from rectangular cyllinder: http://www.cfdsc.ca/english/bulletins/13/1309.html 2. 15th Australasian Fluid Mechanics Conference The University of Sydney, Sydney, Australia 13-17 December 2004 Flow Structure Around A Finite-Length Square Prism H.F. Wang, Y. Zhou, C.K. Chan, W. O. Wong 3. AUTHOR = "R. J. Martinuzzi and M. AbuOmar", TITLE = "Study of the flow around surface-mounted pyramids", JOURNAL = "Experiments in Fluids", VOLUME = "34", YEAR = "2003", PAGES = "379-389" The last two articles i can send you by E-Mail. Kind reagards Ianina

 December 27, 2005, 08:27 Re: Help with: Vortex Shedding at Re~30000 in 2D? #5 Ianina Guest   Posts: n/a One more article: "Two-Dimensional Study of the Turbulent Wake Behind a Square Cylinder Subject to Uniform Shear" A. K. Saha G. Biswas K. Muralidhar in: Journal of Fluids Engineering SEPTEMBER 2001, Vol. 123, p. 595-603 Can be relevant for you : flow at RE = 20 000 Hope it helps Ianina

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