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Dynamical Two-Way Nesting in HBM
Per Berg
DMI
(Abstract received 04/30/2015 for session X)
ABSTRACT
The ocean circulation model code HBM (HIROMB-BOOS Model) was designed at DMI for any number of fully dynamical two-way nested areas exchanging mass and momentum between each other across their borders at the numerical time step level so as to obtain continuity of transports and thereby also conservation of mass. Nesting in HBM is used as a practical means of setting up models with different demands of high horizontal resolution, high vertical resolution, large toplayer size and small time step size in different parts of the modelled region. With nesting it becomes feasible to run models operationally that would otherwise be too computationally demanding if one e.g. had to set up the model with the smallest grid spacing and the smallest time step size throughout the entire domain. This talk will attempt to describe some details of the implementation of nesting in HBM. Examples will be shown of applications using the same code but different setups, i.e. the operational forecast model for the official Danish stormsurge warning system to research projects such as climate and bio-geo-chemical modelling on Pan-European scale. Further reading: Implementation details for HBM by Per Berg and Jacob Weismann Poulsen DMI Technical Report 12-11, ISSN: 1399-1388 http://beta.dmi.dk/fileadmin/Rapporter/TR/tr12-11.pdf
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2015 LOM Workshop, Copenhagen, Denmark June 2nd - 4th, 2015