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| Titel |
A finite-volume module for all-scale Earth-system modelling at ECMWF |
| VerfasserIn |
Christian Kühnlein, Sylvie Malardel, Piotr Smolarkiewicz |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141582
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| Publikation (Nr.) |
 EGU/EGU2017-5112.pdf |
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| Zusammenfassung |
| We highlight recent advancements in the development of the finite-volume module (FVM)
(Smolarkiewicz et al., 2016) for the IFS at ECMWF. FVM represents an alternative
dynamical core that complements the operational spectral dynamical core of the IFS
with new capabilities. Most notably, these include a compact-stencil finite-volume
discretisation, flexible meshes, conservative non-oscillatory transport and all-scale governing
equations.
As a default, FVM solves the compressible Euler equations in a geospherical framework
(Szmelter and Smolarkiewicz, 2010). The formulation incorporates a generalised
terrain-following vertical coordinate. A hybrid computational mesh, fully unstructured in
the horizontal and structured in the vertical, enables efficient global atmospheric
modelling. Moreover, a centred two-time-level semi-implicit integration scheme is
employed with 3D implicit treatment of acoustic, buoyant, and rotational modes.
The associated 3D elliptic Helmholtz problem is solved using a preconditioned
Generalised Conjugate Residual approach. The solution procedure employs the
non-oscillatory finite-volume MPDATA advection scheme that is bespoke for the
compressible dynamics on the hybrid mesh (Kühnlein and Smolarkiewicz, 2017). The
recent progress of FVM is illustrated with results of benchmark simulations of
intermediate complexity, and comparison to the operational spectral dynamical core of the
IFS.
C. Kühnlein, P.K. Smolarkiewicz: An unstructured-mesh finite-volume MPDATA for
compressible atmospheric dynamics, J. Comput. Phys. (2017), in press.
P.K. Smolarkiewicz, W. Deconinck, M. Hamrud, C. Kühnlein, G. Mozdzynski, J. Szmelter,
N.P. Wedi: A finite-volume module for simulating global all-scale atmospheric flows, J.
Comput. Phys. 314 (2016) 287-304.
J. Szmelter, P.K. Smolarkiewicz: An edge-based unstructured mesh discretisation in
geospherical framework, J. Comput. Phys. 229 (2010) 4980-4995. |
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