A nonhydrostatic version of FVCOM: 1. Validation experiments

Abstract

[1] The unstructured grid finite volume coastal ocean model (FVCOM) system has been expanded to include nonhydrostatic dynamics. This addition uses the factional step method with both split mode explicit and semi-implicit schemes. The unstructured grid finite volume method, combined with a correction of the final free surface from its intermediate value with inclusion of nonhydrostatic effects, efficiently reduces numerical damping and thus ensures second-order accuracy of the solutions with local/global volume conservation. Numerical experiments have been made to fully validate the nonhydrostatic FVCOM, including surface standing and solitary waves in idealized flat-and slopingbottomed channels in homogeneous conditions, the density adjustment problem for lock exchange flow in a flat-bottomed channel, and two-layer internal solitary wave breaking on a sloping shelf. The model results agree well with the relevant analytical solutions and laboratory data. These validation experiments demonstrate that the nonhydrostatic FVCOM is capable of resolving complex nonhydrostatic dynamics in coastal and estuarine regions.

Coupled Modeling of Hydrodynamics and Sound in Coastal Ocean for Renewable Ocean Energy Development

“…The momentum equations of FVCOM in the horizontal directions have the general form (Chen et al, 2003(Chen et al, , 2006(Chen et al, , 2007Lai et al, 2010) …”

“…However, coupled hydrodynamic and acoustic models have not been developed because of the intensive computational resources needed. We improved the ability to predict sound propagation in coastal regions by coupling of the 3-D ocean hydrodynamic circulation model FVCOM (Finite Volume Community Ocean Model; Chen et al, 2003Chen et al, , 2006Chen et al, , 2007Lai et al, 2010;Yang et al, 2015), which resolves the variations of water density and sea surface elevation, with our 3-D acoustic model that solves underwater sound transmission loss (TL), as well as reflection from lateral, bottom, and surface boundaries and refraction due to varying density fields.…”

JIGSAW-GEO (1.0): locally orthogonal staggered unstructured grid generation for general circulation modelling on the sphere

“…A range of new general circulation models, including the Finite Element Sea Ice-Ocean Model (FESOM) (Wang et al, 2014), the Finite Volume Community Ocean Model (FVCOM) (Chen et al, 2003(Chen et al, , 2007Lai et al, 2010), the Stanford Unstructured Non-hydrostatic Terrain-following Adaptive NavierStokes Simulator (SUNTANS) (Fringer et al, 2006;Vitousek and Fringer, 2014), and the Second-generation Louvainla-Neuve Ice-ocean Model (SLIM) (Bernard et al, 2007;Comblen et al, 2009), are based on semi-structured triangular grids, with the horizontal directions discretised according to an unstructured spherical triangulation, and the ver-D. Engwirda: Unstructured grid-generation for general circulation modelling 2119 tical direction represented as a stack of locally structured layers. The Model for Predication Across Scales (MPAS) (Skamarock et al, 2012;Ringler et al, 2013Ringler et al, , 2008) adopts a similar arrangement, except that a locally orthogonal unstructured discretisation is adopted, consisting of both a Spherical Voronoi Tessellation (SVT) and its dual Delaunay triangulation.…”

Tidal effects on ichthyoplankton aggregation and dispersion in the Southern Gulf of Mexico

“…Once the differences in energies from successive iterations were of the order of 10 -3 or lower, the model was considered to be stable; this occurred after 8 days of simulations. Although the ROMS is a non-hydrostatic model (OEY et al, 2010;LAI et al, 2010), the velocities obtained here were used to compare the inertial versus gravitational forces (Froude number).…”