A mixed finite-element, finite-volume, semi-implicit discretisation for atmospheric dynamics: Cartesian geometry
Melvin, T; Benacchio, T; Shipway, B; et al.Wood, N; Thuburn, J; Cotter, C
Date: 10 February 2018
Article
Journal
Quarterly Journal of the Royal Meteorological Society
Publisher
Wiley / Royal Meteorological Society
Publisher DOI
Abstract
To meet the challenges posed by future generations of massively parallel
supercomputers a reformulation of the dynamical core for the Met Office’s weather
and climate model is presented. This new dynamical core uses explicit finite-volume type
discretisations for the transport of scalar fields coupled with an iterated-implicit, ...
To meet the challenges posed by future generations of massively parallel
supercomputers a reformulation of the dynamical core for the Met Office’s weather
and climate model is presented. This new dynamical core uses explicit finite-volume type
discretisations for the transport of scalar fields coupled with an iterated-implicit, mixed
finite-element discretisation for all other terms. The target model aims to maintain the
accuracy, stability and mimetic properties of the existing Met Office model independent
of the chosen mesh while improving the conservation properties of the model. This
paper details that proposed formulation and, as a first step towards complete testing,
demonstrates its performance for a number of test cases in (the context of) a Cartesian
domain. The new model is shown to produce similar results to both the existing
semi-implicit semi-Lagrangian model used at the Met Office and other models in the
literature on a range of bubble tests and orographically forced flows in two and three
dimensions.
Mathematics and Statistics
Faculty of Environment, Science and Economy
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