An adaptive vertical coordinate system for a coastal flows discontinuous Galerkin finite element model
(2016) Joint Numerical Sea Modelling Group Conference (JONSMOD 2016) — Location: Oslo (10.May.2016)
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- Abstract
- Unstructured-mesh models have shown their efficiency for coastal system modelling. For 3D models, the mesh is often built using a horizontal unstructured grid and a structured vertical column. The discretisation of this vertical column has a large impact on the results, as it has been shown for SLIM 3D, a baroclinic discontinous Galerkin finite element model. For such flows, SLIM 3D exhibits numerical dissipation where strong density gradients occur, especially on the vertical direction. One way to tackle this problem is to adapt the mesh vertical resolution. For some applications when the region of interest varies in time, an adaptive vertical grid may be necessary, as in the internal seiche test case, for which we compare a fixed mesh and a vertical adaptive mesh. During this presentation we will focus on the vertical discretisation of SLIM 3D. Different options will be presented: σ-layers, σ-layers on the bottom with z-layers on the top, and an adaptive vertical grid. This last option system will be studied in further details and its benefits and limitations will be shown.
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Citations
Delandmeter, P., Lambrechts, J., Remacle, J.-F., Legat, V., & Deleersnijder, E. (2016). An adaptive vertical coordinate system for a coastal flows discontinuous Galerkin finite element model. Joint Numerical Sea Modelling Group Conference (JONSMOD 2016), Oslo. https://hdl.handle.net/2078.5/231357