Algorithm for non-hydrostatic dynamics in the Regional Oceanic Modeling Systemстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 29 сентября 2021 г.
Аннотация:A non-hydrostatic algorithm for the Regional Oceanic Modeling System (ROMS) is proposed. It is based on a decomposition
technique for hydrostatic and non-hydrostatic pressure. The algorithm has a pressure-correction scheme with
split-explicit time-stepping for baroclinic and barotropic vertical modes with a free surface. The algorithm implementation
requires solving a Poisson equation for a non-hydrostatic pressure that has a non-symmetric matrix in discrete form. The
efficiency of a different class of solvers and preconditioners were tested. The algorithm is successfully implemented with
several examples where non-hydrostatic effects are important. These include standing external gravity waves; strongly nonlinear
internal wave generation and transformation; stratified shear instability and its associated mixing; and nonlinear
internal tidal generation over a ridge. The corresponding changes in the pre-processing and post-processing infrastructure
in the existing hydrostatic ROMS code were performed to implement parallel elliptic solvers and a new set of dynamical
equations.