An unstructured-mesh atmospheric model for nonhydrostatic dynamics

Authors:
Piotr K. Smolarkiewicz;Joanna Szmelter;Andrzej A. Wyszogrodzki
Affiliations:
European Centre For Medium-Range Weather Forecasts, Reading, RG2 9AX, UK;Loughborough University, Leicestershire LE11 3TU, UK;National Center for Atmospheric Research, Boulder, CO 80307, USA
Venue:
Journal of Computational Physics
Year:
2013

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Abstract

A three-dimensional semi-implicit edge-based unstructured-mesh model is developed that integrates nonhydrostatic anelastic equations, suitable for simulation of small-to-mesoscale atmospheric flows. The model builds on nonoscillatory forward-in-time MPDATA approach using finite-volume discretization and admitting unstructured meshes with arbitrarily shaped cells. The numerical advancements are evaluated with canonical simulations of convective planetary boundary layer and strongly (stably) stratified orographic flows, epitomizing diverse aspects of highly nonlinear nonhydrostatic dynamics. The unstructured-mesh solutions are compared to equivalent results generated with an established structured-grid model and observation.