Direct NumeriSimulations of Penetrative Convection and Generation of Internal Gravity Waves
Abstract
Two-dimensional, direct numerisimulations are used to investigate how thermal convection excites internal gravity waves in the stable layer beneath a convectively unstable zone. The mechanienergy flux carried downwards by the waves strongly depends on the viscosity coefficient. This flux is compared with the energy flux predicted by a simple parametric model of wave generation applied to two models of convection dynamics: one based on the mixing-length treatment and the other on a convective plume model. Numerisimulations always produce substantially larger energy fluxes than the parametric models. This difference may result from shortcomings of the parametric modeling but also from the fact that our simulations are two-dimensional.
- Publication:
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Acta Astronomica
- Pub Date:
- December 2003
- Bibcode:
- 2003AcA....53..321K
- Keywords:
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- Convection;
- Hydrodynamics;
- Gravitational waves