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

• Autorzy: Kiraga M. , Jahn K. , Stępień K. , Zahn J.-P.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

convection; hydrodynamics; gravitational waves

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2003
• Tom: Vol. 56, No. 4
• Strony: 321--339
• Opis fizyczny: Bibliogr. 32 poz., rys., tab., wykr.

Twórcy

autor

Kiraga M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

autor

Jahn K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

autor

Stępień K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

autor

Zahn J.-P.

• LUTH, Observatoire de Paris, Section de Meudon, 5 Pl. J. Janssen, 92195, Meudon, France

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