Shear and Mixing in Oscillatory Doubly Diffusive Convection

Details Shear and Mixing in Oscillatory Doubly Diffusive Convection Shear and Mixing in Oscillatory Doubly Diffusive Convection

2002-03-18

arxiv.org/abs/astro-ph/0203282v1

Astronomy and Astrophysics

Astrophysics

24 pages, 16 figures, Accepted for publication in Geophysical and Astrophysical Fluid Dynamics

Scientific paper

10.1080/03091920290029031

To investigate the mechanism of mixing in oscillatory doubly diffusive (ODD) convection, we truncate the horizontal modal expansion of the Boussinesq equations to obtain a simplified model of the process. In the astrophysically interesting case with low Prandtl number, large-scale shears are generated as in ordinary thermal convection. The interplay between the shear and the oscillatory convection produces intermittent overturning of the fluid with significant mixing. By contrast, in the parameter regime appropriate to sea water, large-scale flows are not generated by the convection. However, if such flows are imposed externally, intermittent overturning with enhanced mixing is observed.

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