High Performance Computing for Computational Science — by Rainald Löhner, Joseph D. Baum, Charles Charman, Daniele

By Rainald Löhner, Joseph D. Baum, Charles Charman, Daniele Pelessone (auth.), José M. L. M. Palma, A. Augusto Sousa, Jack Dongarra, Vicente Hernández (eds.)

The fifth variation of the VECPAR sequence of meetings marked a metamorphosis of the convention name. the whole convention name now reads VECPAR 2002 — fifth Int- nationwide convention on excessive functionality Computing for Computational S- ence. This re?ects extra thoroughly what has been the most emphasis of the convention considering its early days in 1993 – using desktops for fixing pr- lems in technology and engineering. the current postconference publication contains the simplest papers and invited talks awarded through the 3 days of the convention, held on the school of Engineering of the collage of Porto (Portugal), June 26–28 2002. The ebook is prepared into eight chapters, which as a complete attract a large examine group, from these keen on the engineering purposes to these drawn to the particular info of the or software program implementation, in keeping with what, at present, has a tendency to be regarded as Computational technology and Engineering (CSE). The publication contains a complete of forty nine papers, with a popular place reserved for the 4 invited talks and the 2 ?rst prizes of the simplest scholar paper competition.

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Extra info for High Performance Computing for Computational Science — VECPAR 2002: 5th International Conference Porto, Portugal, June 26–28, 2002 Selected Papers and Invited Talks

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82 . The PE of the T3E performs better for the larger grids whereas the differences of the other systems with respect to the differently sized problems remain within a few percent. The behavior of the T3E may be attributed to the stream buffers, but does not hold for even larger grid sizes as can be seen from the results given in the last section: the superlinear speedup for 4 PEs (see Table 1) is possible only due to the relative performance per PE being better for a problem size of 2722 than of 5442 grid points.

There are several possibilities to define the reaction intensity, e. g. the local heat release rate NS q˙ = α=1 Yα ω˙ α hα (9) can be used for this purpose. The temporal evolution of the total heat release rate, which is obtained by integrating q˙ over the computational domain, is shown in Fig. 5 for both turbulent flame kernels as well as for the corresponding laminar flames. The increase of total heat release is related to flame surface growth which is enhanced by the wrinkling of the flame front by the turbulence.

Least-squares methods lead to symmetric and positive definite algebraic systems which circumvent the Ladyzhenskaya-Babuˇska-Brezzi stability condition and consequently allow the use of equal order interpolation polynomials for all variables. The accuracy of a least-squares spectral element discretization of the Stokes problem (cast in velocity-vorticity-pressure form) has been reported in [5, 6] for different boundary conditions. The present paper deals with the efficient parallelization of this solver.

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