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The Langley Aerothermodynamic Upwind Relaxation Algorithm (LAURA), a Navier-Stokes solver, has been modified for use in a parallel, distributed-memory environment using the Message-Passing Interface (MPI) standard. A standard domain decomposition strategy is used in which the computational domain is divided into subdomains with each subdomain assigned to a processor. Performance is examined on dedicated parallel machines and a network of desktop workstations. The effect of domain decomposition and frequency of boundary updates on performance and convergence is also examined for several realistic configurations and conditions typical of large-scale computational fluid dynamic analysis.

The Langley Aerothermodynamic Upwind Relaxation Algorithm (LAURA), a Navier-Stokes solver, has been modified for use in a parallel, distributed-memory environment using the Message-Passing Interface (MPI) standard. A standard domain decomposition strategy is used in which the computational domain is divided into subdomains with each subdomain assigned to a processor. Performance is examined on dedicated parallel machines and a network of desktop workstations. The effect of domain decomposition and frequency of boundary updates on performance and convergence is also examined for several realistic configurations and conditions typical of large-scale computational fluid dynamic analysis.

Controlling interplanetary spacecraft and planning their activities as currently practiced, requires massive amounts of computer time and personnel. To improve this situation, it is desired to use advanced computing to speed up and automate the commanding process. Several design and prototype efforts have been underway at JPL to understand the appropriate roles for concurrent processors in future interplanetary spacecraft operations. Here we report on an effort to identify likely candidates for parallelism among existing software systems that both generate commands to be sent to the spacecraft and simulate what the spacecraft will do with these commands when it receives them. We also describe promising results form effort to reate parallel prototype of representative portions of these systems n the JPL/Caltech Mark III hypercube.