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Astron. Astrophys. 357, 177-179 (2000)


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Turbulent convection: is 2D a good proxy of 3D?

V.M. Canuto

NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA and
Columbia University, Department of Applied Physics, New York, NY 10027, USA

Received 6 September 1999 / Accepted 17 February 2000

Abstract

Several authors have recently carried out 2D simulations of turbulent convection for both solar and massive stars. Fitting the 2D results with the MLT, they obtain that [FORMULA] specifically, [FORMULA]. The authors further suggest that this methodology could be used to calibrate the MLT used in stellar evolutionary codes. We suggest the opposite viewpoint: the 2D results show that MLT is internally inconsistent because the resulting [FORMULA] violates the MLT basic assumption that [FORMULA]. When the 2D results are fitted with the CM model, [FORMULA], in accord with the basic tenet of the model.

On the other hand, since both MLT and CM are local models, they should be replaced by the next generation of non-local, time dependent turbulence models which we discuss in some detail.

Key words: convection – stars: interiors


© European Southern Observatory (ESO) 2000

Online publication: May 3, 2000

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