An unstructured-mesh atmospheric model for nonhydrostatic dynamics: Towards optimal mesh resolution

JOURNAL OF COMPUTATIONAL PHYSICS

卷:294

Article

Szmelter, Joanna¹  Zhang, Zhao²  Smolarkiewicz, Piotr K.³ 

[1] Univ Loughborough, Loughborough LE11 3TU, Leics, England

[2] Heriot Watt Univ, Edinburgh EH14 4AS, Midlothian, Scotland

[3] European Ctr Medium Range Weather Forecasts, Reading RG2 9AX, Berks, England

关键词: Unstructured mesh atmospheric models;    Nonoscillatory forward-in-time schemes;    Anelastic equations;    Orographic flows;    Critical layer;   

DOI  :  10.1016/j.jcp.2015.03.054

来源: Elsevier

【 摘 要 】

The paper advances the limited-area anelastic model (Smolarkiewicz et al. (2013) [ 45]) for investigation of nonhydrostatic dynamics in mesoscale atmospheric flows. New developments include the extension to a tetrahedral-based median-dual option for unstructured meshes and a static mesh adaptivity technique using an error indicator based on inherent properties of the Multidimensional Positive Definite Advection Transport Algorithm (MPDATA). The model employs semi-implicit nonoscillatory forward-in-time integrators for soundproof PDEs, built on MPDATA and a robust non-symmetric Krylovsubspace elliptic solver. Finite-volume spatial discretisation adopts an edge-based data structure. Simulations of stratified orographic flows and the associated gravitywave phenomena in media with uniform and variable dispersive properties verify the advancement and demonstrate the potential of heterogeneous anisotropic discretisation with large variation in spatial resolution for study of complex stratified flows that can be computationally unattainable with regular grids. (C) 2015 Elsevier Inc. All rights reserved.

【 授权许可】

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