Irregular Grids in MM90

30km Irregular Grid

This image is a Vis5d rendering of parallel model output from an irregular MM90 grid centered over Korea, approximately 3 hours into the Typhoon Faye data set. Irregular grids are a new feature being developed in an experimental version of MM90 to provide functionality similar to overlapping grids in the source MM5 model. The shape and size of the grid is specified by its outline, and the area is treated as a single domain. This allows the fitting of high resolution computations to an irregularly shaped feature of interest without the need for redundant computations or complicated code to handle the overlap regions.

The unusual and arbitrary looking ``cross'' shape of this domain was chosen for development purposes; it has all the inner and outer corners and edges that need to be accounted for on the boundaries. The normal shape for such a grid would be more organic looking and adapted to features in the simulation itself.

This version of MM90 that supports irregular grids is considered experimental and is not being made available at this time.

Mpeg movie of an Irregular Grid (233 KB). This is over the Typhoon Faye 30km resolution domain.

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