Nonlinear interactions between convection, rotation and flows with vertical shear

Details Nonlinear interactions between convection, rotation and flows with vertical shear Nonlinear interactions between convection, rotation and flows with vertical shear

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jfm...164...91h&link_type=abstract

Journal of Fluid Mechanics (ISSN 0022-1120), vol. 164, March 1986, p. 91-105. Research supported by the University of California

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19

Computational Fluid Dynamics, Convective Heat Transfer, Nonlinear Equations, Rotating Fluids, Shear Flow, Vortices, Planetary Atmospheres, Planetary Rotation, Prandtl Number, Rayleigh Number, Solar Atmosphere, Solar Planetary Interactions, Solar Rotation, Time Dependence

Scientific paper

The effects of a mean flow with vertical shear on the convective motions in a rotating layer are examined using a three-dimensional and time-dependent numerical model. In the absence of rotation, the convective motions are shown to be dominated by the shear flow when the Richardson number becomes greater than about -1.0. Both heat and momentum are carried down their respective gradients. For rotating cases with vertical rotation vectors, the Coriolis force turns the flow induced by the convection to produce a more complicated shear that changes direction with height. For rotating cases with tilted rotation vectors, the results depend on the direction of the shear. When the imposed flow is in the opposite direction, the convection motions are less energetic and are even suppressed entirely when the shear is strong. When the imposed flow is in the same direction, as that produced by the rotation, the convective motions are enhanced and a countergradient flux of momentum can be produced.

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