- Author
-
Lie, I.
|
Skalin, R.
- Title
- Multidomain Algorithm for Advection Problems and Its Application to Atmospheric Models.
- Coporate
- SINTEF-Norwegian Institute of Technology, Trondheim, Norway
- Report
-
STF10 A93008
April 28, 1993
23 p.
- Keywords
-
algorithms
|
equations
|
experiments
|
computers
- Abstract
- We describe a concept for multidomain solution of advection problems. Multidomain solution requires interface conditions, and such conditions are constructed on the basis of open (or transarent) boundary conditions. We will use Chebyshev spectral collocation for space discretization and Runge-Kutta methods for time discretization on each domain. Numerical experiments are presented showing that this method is well suited for solving advection problems, both in the monodomain and multidomain case. The potential for parallel computations is one of the motivations behind multidomain techniques, and we describe a parallel implementation of the algorithm on distributed memory MIMD computers and on a network of heterogeneous computers, using a message passing system. This implementation is based on performing the computations in the subdomains and the boundary procedures in parallel for a given time window and then synchronizing the solution of the ordinary differential equations. Initial results showing the parallel speedup of the algorithm are presented. We finally discuss how this multidomain algorithm can be applied in atmospheric models. This report contains a preprint of a paper presented at the Fifth ECMWF Workshop on Use of Parallel Processors in Meteoreology, ECMWF,Reading, United Kingdom, 23-27 November 1992.