Thetis coastal ocean model: Discontinuous Galerkin discretization for the three-dimensional hydrostatic equations

Tuomas Kärnä, Stephan C. Kramer, Lawrence Mitchell, David A. Ham, Matthew D. Piggott, António M. Baptista

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Unstructured grid ocean models are advantageous for simulating the coastal ocean and river-estuary-plume systems. However, unstructured grid models tend to be diffusive and/or computationally expensive, which limits their applicability to real-life problems. In this paper, we describe a novel discontinuous Galerkin (DG) finite element discretization for the hydrostatic equations. The formulation is fully conservative and second-order accurate in space and time. Monotonicity of the advection scheme is ensured by using a strong stability-preserving time integration method and slope limiters. Compared to previous DG models, advantages include a more accurate mode splitting method, revised viscosity formulation, and new second-order time integration scheme. We demonstrate that the model is capable of simulating baroclinic flows in the eddying regime with a suite of test cases. Numerical dissipation is well-controlled, being comparable or lower than in existing state-of-the-art structured grid models.

Original languageEnglish (US)
Pages (from-to)4359-4382
Number of pages24
JournalGeoscientific Model Development
Volume11
Issue number11
DOIs
StatePublished - Oct 30 2018

ASJC Scopus subject areas

  • Modeling and Simulation
  • Earth and Planetary Sciences(all)

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