On drag, Strouhal number and vortex-street structure

Autor:	Boye Ahlborn, Mae Seto, Bernd R. Noack
Rok vydání:	2002
Předmět:	Fluid Flow and Transfer Processes Physics Drag coefficient Mechanical Engineering General Physics and Astronomy Reynolds number Mechanics Wake Kármán vortex street Physics::Fluid Dynamics symbols.namesake Classical mechanics Drag Parasitic drag symbols Strouhal number Conservation of mass
Zdroj:	Fluid Dynamics Research. 30:379-399
ISSN:	1873-7005 0169-5983
Popis:	A phenomenological model for the vortex-shedding process behind bluff cylindrical bodies is proposed. Relationships between Strouhal frequency St, drag coefficient cD, Reynolds number Re and geometric wake parameters are obtained from mass conservation, momentum conservation in the transverse direction and energy considerations. For the first time, Roshko's (Technical Report TN 3169, NACA, US Government Printing Office, Washington DC, 1954) experimental discovery of vortex-street similarity behind different cylinders is analytically derived. In addition, the empirically obtained Strouhal-frequency laws of Roshko (Technical Report TN1191, NACA, US Government Printing Office, Washington DC, 1954) and Fey (Phys. Fluids A 10 (1998) 1547) are also reproduced. Measurements of St and cD including their Re dependency for flows around cylinders with circular, square, triangular, semi-circular and other cross sections agree favorably with the proposed model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::18d363b9ca90f05079baf1286da359f1 https://doi.org/10.1016/s0169-5983(02)00062-x Zobrazit plný text záznamu