Publication Abstracts

Engwirda et al. 2017

Engwirda, D., M. Kelley, and J. Marshall, 2017: High-order accurate finite-volume formulations for the pressure gradient force in layered ocean models. Ocean Model., 116, 1-15, doi:10.1016/j.ocemod.2017.05.003.

Discretisation of the horizontal pressure gradient force in layered ocean models is a challenging task, with non-trivial interactions between the thermodynamics of the fluid and the geometry of the layers often leading to numerical difficulties. We present two new finite-volume schemes for the pressure gradient operator designed to address these issues. In each case, the horizontal acceleration is computed as an integration of the contact pressure force that acts along the perimeter of an associated momentum control-volume. A pair of new schemes are developed by exploring different control-volume geometries. Non-linearities in the underlying equation-of-state definitions and thermodynamic profiles are treated using a high-order accurate numerical integration framework, designed to preserve hydrostatic balance in a non-linear manner. Numerical experiments show that the new methods achieve high levels of consistency, maintaining hydrostatic and thermobaric equilibrium in the presence of strongly-sloping layer geometries, non-linear equations-of-state and non-uniform vertical stratification profiles. These results suggest that the new pressure gradient formulations may be appropriate for general circulation models that employ hybrid vertical coordinates and/or terrain-following representations.

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BibTeX Citation

@article{en07000h,
  author={Engwirda, D. and Kelley, M. and Marshall, J.},
  title={High-order accurate finite-volume formulations for the pressure gradient force in layered ocean models},
  year={2017},
  journal={Ocean Model.},
  volume={116},
  pages={1--15},
  doi={10.1016/j.ocemod.2017.05.003},
}

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RIS Citation

TY  - JOUR
ID  - en07000h
AU  - Engwirda, D.
AU  - Kelley, M.
AU  - Marshall, J.
PY  - 2017
TI  - High-order accurate finite-volume formulations for the pressure gradient force in layered ocean models
JA  - Ocean Model.
VL  - 116
SP  - 1
EP  - 15
DO  - 10.1016/j.ocemod.2017.05.003
ER  -

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