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| Titel |
ASAM v2.7: a compressible atmospheric model with a Cartesian cut cell approach |
| VerfasserIn |
M. Jähn, O. Knoth, M. König, U. Vogelsberg |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 2 ; Nr. 8, no. 2 (2015-02-18), S.317-340 |
| Datensatznummer |
250116112
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| Publikation (Nr.) |
 copernicus.org/gmd-8-317-2015.pdf |
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| Zusammenfassung |
| In this work, the fully compressible, three-dimensional,
nonhydrostatic atmospheric model called All Scale Atmospheric Model
(ASAM) is presented.
A cut cell approach is used to include
obstacles and orography into the Cartesian grid. Discretization is
realized by a mixture of finite differences and finite volumes and
a state limiting is applied.
Necessary shifting and interpolation techniques are outlined.
The method can be generalized to any other orthogonal grids, e.g., a lat–long grid.
A linear implicit Rosenbrock time integration scheme
ensures numerical stability in the presence of fast sound waves and
around small cells.
Analyses of five two-dimensional benchmark test cases from the literature
are carried out to show that the described method produces meaningful results
with respect to conservation properties and model accuracy.
The test cases are partly modified in a way that the flow field or scalars
interact with cut cells.
To make the model applicable for atmospheric problems,
physical parameterizations like
a Smagorinsky subgrid-scale model, a two-moment bulk microphysics
scheme, and precipitation and surface fluxes using a sophisticated multi-layer
soil model are implemented and described.
Results of an idealized three-dimensional simulation are shown, where the flow field
around an idealized mountain with subsequent gravity wave generation,
latent heat release, orographic clouds and precipitation are modeled. |
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