Beitrag
On discontinuous Galerkin approach for atmospheric flow in the mesoscale with and without moisture
Schuster, Dieter; Brdar, Slavko; Baldauf, Michael; Dedner, Andreas; Klöfkorn, Robert; Kröner, Dietmar
Meteorologische Zeitschrift Vol. 23 No. 4 (2014), p. 449 - 464
43 Literaturangaben
veröffentlicht: Sep 26, 2014
Online veröffentlicht: Aug 27, 2014
Manuskript akzeptiert: Jun 3, 2014
finale Ms. Revision erhalten: Apr 22, 2014
Manuskript-Revision angefordert: Mar 10, 2014
Manuskript erhalten: Dec 16, 2013
DOI: 10.1127/0941-2948/2014/0565
Open Access (Arbeit kann kostenlos heruntergeladen werden)
Abstract
We present and discuss discontinuous Galerkin (DG) schemes for dry and moist atmospheric flows in the mesoscale. We derive terrain-following coordinates on the sphere in strong-conservation form, which makes it possible to perform the computation on a Cartesian grid and yet conserves the momentum density on an f$f$-plane. A new DG model, i.e. DG-COSMO, is compared to the operational model COSMO of the Deutscher Wetterdienst (DWD). A simplified version of the suggested terrain-following coordinates is implemented in DG-COSMO and is compared against the DG dynamical core implemented within the DUNE framework, which uses unstructured grids to capture orography. Finally, a few idealised test cases, including 3d and moisture, are used for validation. In addition an estimate of efficiency for locally adaptive grids is derived for locally and non-locally occurring phenomena.
Schlagworte
dynamical core • discontinuous galerkin • coupling physics