DieCAST (Dietrich Center for Air Sea Technology)
Posted March 20, 2002,18:16
Institution: National Taiwan University
The DieCAST (Dietrich Center for Air Sea Technology) model is a primitive equation, z-level ocean and lake model patterned after the Sandia Ocean Modeling System (SOMS). The model is hydrostatic, incompressible, rigid-lid, partially implicit, and fully conservative. The numerical differences from the SOMS model stem only from using an Arakawa A grid instead of the Arakawa C grid used by SOMS. The DieCAST model is simpler and requires less computation per time step than the SOMS model. It is also stable with substantially longer time step. Both DieCAST and SOMS use higher order treatment of the generally dominat terms in ocean dynamics, i.e. pressure gradient and Coriolis. This leads to accurate and robust (stable with realistically small dissipation) models.