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Convective dynamics with mixed temperature boundary conditions: Why thermal relaxation matters and how to accelerate it by Anders, Evan H. ;Vasil, Geoffrey M. ;Brown, Benjamin P. ;Korre, Lydia is a Engineering article available to read on EtoBox.

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Astrophysical simulations of convection frequently impose different thermal boundary conditions at the top and the bottom of the domain in an effort to more accurately model natural systems. In this work, we study Rayleigh-Bénard convection (RBC) under the Boussinesq approximation. We examine simulations with mixed temperature boundary conditions in which the flux is fixed at the bottom boundary and the temperature is fixed at the top ("FT"). We aim to understand how FT boundaries change the nature of the convective solution compared to the traditional choice of thermal boundaries, in which the temperature is fixed at the top and bottom of the domain ("TT"). We demonstrate that the timescale of thermal relaxation for FT simulations is dependent upon the initial conditions. "Classic" initial conditions that employ a hydrostatically-and thermally-balanced linear temperature profile exhibit a long thermal relaxation. This long relaxation is not seen in FT simulations, which use a TT simulation's nonlinear state as initial conditions ("TT-to-FT"). In the thermally relaxed, statistically stationary state, the mean behavior of an FT simulation corresponds to an equivalent simulation with

Who reads Convective dynamics with mixed temperature boundary conditions: Why thermal relaxation matters and how to accelerate it?

Author

Anders, Evan H. ;Vasil, Geoffrey M. ;Brown, Benjamin P. ;Korre, Lydia

Publisher

American Physical Society (APS)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)