PARALLELIZATION OF A SIMULATION CODE FOR REACTIVE FLOWS ON THE INTEL PARAGON

The paper shows the implementation of a 3D simulation code for turbule nt how and combustion processes in full-scale utility boilers on an In tel Paragon XP/S computer. For the portable parallelization, an explic it approach is chosen using a domain decomposition method for the stat ic subdivision of the numerical grid together with the SPMD programmin g model. The measured speedup for the presented case using a coarse gr id is good, although some numerical requirements restrict the implemen ted message passing to strongly synchronized communication. On the Par agon, the NX message passing library is used for the computations. Fur thermore, MPI and PVM are applied and their pros and cons on this comp uter are described. In addition to the basic message passing technique s for local and global communication, other possibilities are investig ated. Besides the applicability of the vectorizing capability of the c ompiler, the influence of the I/O performance during computations is d emonstrated. The scalability of the parallel application is presented for a refined discretization.