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On the influence of gravity in the dynamics of geophysical flows
Mathematics in Engineering 2023, 5(1): 1-33
Published: 15 February 2023
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In the present paper, we study a multiscale limit for the barotropic Navier-Stokes system with Coriolis and gravitational forces, for vanishing values of the Mach, Rossby and Froude numbers ( Ma, Ro and Fr, respectively). The focus here is on the effects of gravity: albeit remaining in a low stratification regime Ma/Fr0, we consider scaling for the Froude number which go beyond the "critical" value Fr=Ma. The rigorous derivation of suitable limiting systems for the various choices of the scaling is shown by means of a compensated compactness argument. Exploiting the precise structure of the gravitational force is the key to get the convergence.

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