The generation and decay of vorticity

Details The generation and decay of vorticity The generation and decay of vorticity

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gapfd..28..277m&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics (ISSN 0309-1929), vol. 28, April 1984, p. 277-308.

Statistics

Computation

49

Boundary Value Problems, Computational Fluid Dynamics, Vortex Generators, Vorticity, Blasius Flow, Boundary Layer Flow, Couette Flow, Flat Plates, Flow Velocity, Inviscid Flow, Pressure Gradients, Slip Flow, Viscous Flow, Vorticity Equations

Scientific paper

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 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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