EGU2020-19054
https://doi.org/10.5194/egusphere-egu2020-19054
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Ice melting in a turbulent stratified shear flow

Louis-Alexandre Couston1, Eric Hester2, Benjamin Favier3, Adrian Jenkins1, and Paul Holland1
Louis-Alexandre Couston et al.
  • 1British Antarctic Survey, Cambridge, UK (loton@bas.ac.uk)
  • 2Department of Mathematics and Statistics, University of Sydney, Australia
  • 3Institut de Recherche sur les Phénomènes Hors Equilibre, Aix-Marseille Université, Marseille, France

In this talk I will present preliminary results of direct numerical simulations of ice melting in a turbulent stratified shear flow. The model solves the evolution of the turbulent fluid phase and of the diffusive solid ice phase, due to melting and freezing, in a fully coupled way. This is done by combining a Direct Numerical Simulation (DNS) code with a novel formulation of the equations for the solid and liquid phases of water based on the phase-field method. DNS enables turbulent motions to be simulated without approximation, i.e. solving Navier Stokes equations, while the phase-field method allows the ice-ocean interface to be rough and evolve in response to melting. I will present results on the turbulent boundary layer and on the self-generated basal topography at the ice-water interface. The ultimate goal of this work is to propose a new DNS-based parameterization of the melting process at rough ice-ocean boundaries that takes into account the effects of temperature and salt stratification, and flow velocities.

How to cite: Couston, L.-A., Hester, E., Favier, B., Jenkins, A., and Holland, P.: Ice melting in a turbulent stratified shear flow, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-19054, https://doi.org/10.5194/egusphere-egu2020-19054, 2020

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