Search results for "Distributed memory"

showing 3 items of 13 documents

Parallel Schwarz methods for convection-dominated semilinear diffusion problems

2002

AbstractParallel two-level Schwarz methods are proposed for the numerical solution of convection-diffusion problems, with the emphasis on convection-dominated problems. Two variants of the methodology are investigated. They differ from each other by the type of boundary conditions (Dirichlet- or Neumann-type) posed on a part of the second-level subdomain interfaces. Convergence properties of the two-level Schwarz methods are experimentally compared with those of a variant of the standard multi-domain Schwarz alternating method. Numerical experiments performed on a distributed memory multiprocessor computer illustrate parallel efficiency of the methods.

Parallel computingApplied MathematicsNumerical analysisMathematical analysisParallel algorithmDomain decomposition methodsSingularly perturbed semilinear convection–diffusion problemMulti-level Schwarz methodsComputational MathematicsAdditive Schwarz methodDistributed memoryBoundary value problemSchwarz alternating methodConvection–diffusion equationMathematicsJournal of Computational and Applied Mathematics
researchProduct

PenRed: An extensible and parallel Monte-Carlo framework for radiation transport based on PENELOPE

2021

Monte Carlo methods provide detailed and accurate results for radiation transport simulations. Unfortunately, the high computational cost of these methods limits its usage in real-time applications. Moreover, existing computer codes do not provide a methodology for adapting these kind of simulations to specific problems without advanced knowledge of the corresponding code system, and this restricts their applicability. To help solve these current limitations, we present PenRed, a general-purpose, stand-alone, extensible and modular framework code based on PENELOPE for parallel Monte Carlo simulations of electron-photon transport through matter. It has been implemented in C++ programming lan…

Parallel computingPhysics - Instrumentation and DetectorsAtomic Physics (physics.atom-ph)FortranRadiation transportFOS: Physical sciencesGeneral Physics and AstronomyParallel computingcomputer.software_genre01 natural sciencesPhysics - Atomic Physics010305 fluids & plasmasElectron-photon showers0103 physical sciencesCIENCIAS DE LA COMPUTACION E INTELIGENCIA ARTIFICIAL010306 general physicsMonte Carlo simulationcomputer.programming_languageMPICHbusiness.industryInstrumentation and Detectors (physics.ins-det)Construct (python library)Computational Physics (physics.comp-ph)Modular designPhysics - Medical PhysicsShared memoryHardware and ArchitectureProgramming paradigmDistributed memoryMPIMedical Physics (physics.med-ph)CompilerMedical physicsbusinessPhysics - Computational Physicscomputer
researchProduct

Comparison of parallel implementation of some multi-level Schwarz methods for singularly perturbed parabolic problems

1999

Abstract Parallel multi-level algorithms combining a time discretization and an overlapping domain decomposition technique are applied to the numerical solution of singularly perturbed parabolic problems. Two methods based on the Schwarz alternating procedure are considered: a two-level method with auxiliary “correcting” subproblems as well as a three-level method with auxiliary “predicting” and “correcting” subproblems. Moreover, modifications of the methods using time extrapolation on subdomain interfaces are investigated. The emphasis is given to the description of the algorithms as well as their computer realization on a distributed memory multiprocessor computer. Numerical experiments …

Predictor–corrector methodParallel computingSingular perturbationPartial differential equationDiscretizationApplied MathematicsMathematical analysisExtrapolationMathematicsofComputing_NUMERICALANALYSISDomain decomposition methodsComputational MathematicsMulti-level Schwarz methodApplied mathematicsSingularly perturbed parabolic problemDistributed memorySchwarz alternating methodMathematicsJournal of Computational and Applied Mathematics
researchProduct