The Physics of Subgrid Scales in Numerical Simulations of Stellar Convection: Are They Dissipative, Advective, or Diffusive?

Details The Physics of Subgrid Scales in Numerical Simulations of Stellar Convection: Are They Dissipative, Advective, or Diffusive? The Physics of Subgrid Scales in Numerical Simulations of Stellar Convection: Are They Dissipative, Advective, or Diffusive?

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...541l..79c&link_type=abstract

The Astrophysical Journal, Volume 541, Issue 2, pp. L79-L82.

Astronomy and Astrophysics

Astronomy

7

Convection, Stars: Evolution, Stars: Interiors

Scientific paper

All numerical simulations of stellar convection assume that the unresolved subgrid scales (SGSs) are only dissipative. We show that the assumption is incorrect and that the SGSs stir (advection), mix (diffusion), and dissipate. The first two processes were never considered before. We also show that there are two advective velocities: one contributed by the resolved scales and the other, a bolus velocity, by the unresolved scales.

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