Effect of boundary conditions on axial flow in a concentrated vortex core
作者:
Richard K. Cohn,
Manoochehr M. Koochesfahani,
期刊:
Physics of Fluids A
(AIP Available online 1993)
卷期:
Volume 5,
issue 1
页码: 280-282
ISSN:0899-8213
年代: 1993
DOI:10.1063/1.858784
出版商: AIP
数据来源: AIP
摘要:
The character of axial flow in the core of a concentrated line vortex is studied using flow visualization. Results show that axial flow can be initiated when the no‐slip boundary condition is imposed on the vortex core over a spatial extent comparable to the core diameter. It is further demonstrated that no‐slip is not a necessary condition to generate the axial flow; a region of spanwise shear (i.e., a slip boundary) is sufficient. Two distinct axial flow velocity profiles are observed; they are either jetlike or spatially undulated corresponding to a maximum axial speed occurring at the core center or outer edge, respectively.
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