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Direct Numerical Simulations of Penetrative Convection and Generation of Internal Gravity Waves

Kiraga M., Jahn K., Stępień K., Zahn J.-P.

Acta Astronomica

2003

Vol. 56, No. 4

321--339

Two-dimensional, direct numerical simulations are used to investigate how thermal convection excites internal gravity waves in the stable layer beneath a convectively unstable zone. The mechanical energy 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. Numerical simulations 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.