期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 728, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/728/2/L29
关键词
hydrodynamics; instabilities; turbulence
资金
- National Science Foundation [NSF-0933759]
- NASA [NNG05GG69G, NNG06GD44G, NNX07A2749]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0933759] Funding Source: National Science Foundation
We present the first three-dimensional simulations of fingering convection performed at parameter values approaching those relevant for astrophysics. Our simulations reveal the existence of simple asymptotic scaling laws for turbulent heat and compositional transport, which can be straightforwardly extrapolated from our numerically tractable values to the true astrophysical regime. Our investigation also indicates that thermo-compositional staircases, a key consequence of fingering convection in the ocean, cannot form spontaneously in the fingering regime in stellar interiors. Our proposed empirically determined transport laws thus provide simple prescriptions for mixing by fingering convection in a variety of astrophysical situations, and should, from here on, be used preferentially over older and less accurate parameterizations. They also establish that fingering convection does not provide sufficient extra-mixing to explain observed chemical abundances in red giant branch stars.
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