Extended Abstract (912K)5.3
A semi-lagrangian dynamical core for the non-hydrostatic wrf model
R. James Purser, General Sciences Corporation, Beltville, MD; and T. Fujita, S. K. Kar, and J. G. Michalakes
A non-hydrostatic semi-Lagrangian dynamical core is under development as part of the multi-institution Weather Research and Forecasting (WRF) initiative. The model employs high-order operators for spatial differencing and for the mass-conserving grid-to-grid `cascade' interpolations. The semi-Lagrangian advection with forward trajectories permits the implementation of low-storage third- and fourth-order Runge-Kutta time integrations. Suitable modifications of the Runge-Kutta scheme allow the fast acoustic modes of the model to be treated in a semi-implicit way. We shall describe some of these features in greater detail and discuss implementation strategies that take advantage of massive parallelization. Results from preliminary tests will also be presented.
Session 5, Numerics and model structure (Parallel with session J2)
Tuesday, 31 July 2001, 10:00 AM-11:15 AM
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