jigsaw-geo (1.0): locally orthogonal staggered unstructured grid generation for general circulation modelling on the sphere
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2017
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Abstract
An algorithm for the generation of
non-uniform, locally orthogonal staggered unstructured spheroidal grids is
described. This technique is designed to generate very high-quality staggered
Voronoi–Delaunay meshes appropriate for general circulation modelling on the
sphere, including applications to atmospheric simulation, ocean-modelling and
numerical weather prediction. Using a recently developed Frontal-Delaunay
refinement technique, a method for the construction of high-quality
unstructured spheroidal Delaunay triangulations is introduced. A locally
orthogonal polygonal grid, derived from the associated Voronoi diagram, is
computed as the staggered dual. It is shown that use of the Frontal-Delaunay
refinement technique allows for the generation of very high-quality
unstructured triangulations, satisfying a priori bounds on element size and
shape. Grid quality is further improved through the application of
hill-climbing-type optimisation techniques. Overall, the algorithm is shown
to produce grids with very high element quality and smooth grading
characteristics, while imposing relatively low computational expense. A
selection of uniform and non-uniform spheroidal grids appropriate for
high-resolution, multi-scale general circulation modelling are presented.
These grids are shown to satisfy the geometric constraints associated with
contemporary unstructured C-grid-type finite-volume models, including the
Model for Prediction Across Scales (MPAS-O). The use of user-defined
mesh-spacing functions to generate smoothly graded, non-uniform grids for
multi-resolution-type studies is discussed in detail.
| Reference Key |
engwirda2017geoscientificjigsaw-geo
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|---|---|
| Authors | ;D. Engwirda;D. Engwirda |
| Journal | international journal of quantum chemistry |
| Year | 2017 |
| DOI |
10.5194/gmd-10-2117-2017
|
| URL | |
| Keywords |
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