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Canuto, V.M., 2000: Turbulent convection: Is 2D a good proxy of 3D? Astron. Astrophys., 357, 177-179.
Several authors recently carried out 2D simulations of turbulent conection for both solar and massive stars. Fitting the 2D results with the MLT, they obtain that αMLT > 1, specifically 1.4 ≤ αMLT ≤ 1.8. 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 result αMLT > 1 violates the MLT basic assumption that αMLT < 1. When the 2D results are fitted with the CM model, αMLT < 1, 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.
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