The generation and decay of vorticity
作者:
B.R. Morton,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 1984)
卷期:
Volume 28,
issue 3-4
页码: 277-308
ISSN:0309-1929
年代: 1984
DOI:10.1080/03091928408230368
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Vorticity, although not the primary variable of fluid dynamics, is an important derived variable playing both mathematical and physical roles in the solution and understanding of problems. The following treatment discusses the generation of vorticity at rigid boundaries and its subsequent decay. It is intended to provide a consistent and very broadly applicable framework within which a wide range of questions can be answered explicitly. The rate of generation of vorticity is shown to be the relative tangential acceleration of fluid and boundary without taking viscosity into account and the generating mechanism therefore involves the tangential pressure gradient within the fluid and the external acceleration of the boundary only. The mechanism is inviscid in nature and independent of the no-slip condition at the boundary, although viscous diffusion acts immediately after generation to spread vorticity outward from boundaries. Vorticity diffuses neither out of boundaries nor into them, and the only means of decay is by cross-diffusive annihilation within the fluid.
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