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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2018-112
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-112
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 25 Jul 2018

Model description paper | 25 Jul 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Geoscientific Model Development (GMD).

FESOM-C: coastal dynamics on hybrid unstructured meshes

Alexey Androsov1,3, Vera Fofonova1, Ivan Kuznetsov2, Sergey Danilov1,4,5, Natalja Rakowsky1, Sven Harig1, and Karen Helen Wiltshire1 Alexey Androsov et al.
  • 1Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany
  • 2Institute of Coastal Research, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
  • 3Shirshov Institute of Oceanology, Moscow, Russia
  • 4A. M. Obukhov Institute of Atmospheric Physics, Moscow, Russia
  • 5Jacobs University, Bremen, Germany

Abstract. We describe FESOM-C, the coastal branch of the Finite-volumE Sea ice -- Ocean Model (FESOM2), which shares with FESOM2 many numerical aspects, in particular, its finite-volume cell-vertex discretization. Its dynamical core differs by the implementation of time stepping, the use of terrain-following vertical coordinate and formulation for hybrid meshes composed of triangles and quads. The first two distinctions were critical for coding FESOM-C as an independent branch. The hybrid mesh capability improves numerical efficiency, since quadrilateral cells have fewer edges than triangular cells. They do not suffer from spurious inertial modes of the triangular cell-vertex discretization and need less dissipation. The hybrid mesh capability allows one to use quasi-quadrilateral unstructured meshes, with triangular cells included only to join quadrilateral patches of differt resolution or instead of strongly deformed quadrilateral cells. The description of the model numerical part is complemented by test cases illustrating the model performance.

Alexey Androsov et al.
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Alexey Androsov et al.
Alexey Androsov et al.
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Latest update: 13 Dec 2018
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Short summary
We present a description of a coastal ocean circulation model designed to work on variable resolution meshes made of triangular and quadrilateral cells. This hybrid mesh functionality allows for higher numerical performance and less dissipative solutions.
We present a description of a coastal ocean circulation model designed to work on variable...
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