Journal
ANNUAL REVIEW OF FLUID MECHANICS, VOL 50
Volume 50, Issue -, Pages 275-298Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-fluid-122316-045234
Keywords
convection; double-diffusive convection; direct numerical simulations; astrophysical fluid dynamics; thermohaline convection; semiconvection
Categories
Funding
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1412951] Funding Source: National Science Foundation
Ask authors/readers for more resources
This work reviews present knowledge of double-diffusive convection at low Prandtl number obtained using direct numerical simulations, in both the fingering regime and the oscillatory regime. Particular emphasis is given to modeling the induced turbulent mixing and its impact in various astrophysical applications. The nonlinear saturation of fingering convection at low Prandtl number usually drives small-scale turbulent motions whose transport properties can be predicted reasonably accurately using a simple semi-analytical model. In some instances, large-scale internal gravity waves can be excited by a collective instability and eventually cause layering. The nonlinear saturation of oscillatory double-diffusive convection exhibits much more complex behavior. Weakly stratified systems always spontaneously transition into layered convection associated with very efficient mixing. More strongly stratified systems remain dominated by weak wave turbulence unless they are initialized into a layered state. The effects of rotation, shear, lateral gradients, and magnetic fields are briefly discussed.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available