Conference Paper

Application Enabling in DEISA: Petascaling of Plasma Turbulence Codes.

Conference: Parallel Computing: Architectures, Algorithms and Applications, ParCo 2007, Forschungszentrum Jülich and RWTH Aachen University, Germany, 4-7 September 2007
Source: DBLP
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Available from: Hermann Lederer, Jan 07, 2014
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    • "In gyrokinetics the resolution of the gyration in time is dropped so that the development of turbulence in time can be directly observed. But even with its mature parallelization performance [2] [3], GENE is facing scalability problems due to the curse of dimensionality, since even moderate resolutions in each dimension lead to tremendous numbers of degrees of freedom in the simulations. One remedy to that could be the application of sparse grids [4], since they reduce the amount of degrees of freedom used to retrieve a solution. "
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    ABSTRACT: Using the five-dimensional gyrokinetic equations for simulations of hot fusion plasmas requires discretizations with a lot degrees of freedom due to the curse of dimensionality. The sparse grid combination technique could be one remedy to this problem, since it is dividing the original problem into smaller subproblems, which can be solved independently. For this study, the gyrokinetic code GENE has been used for solving the gyrokinetic eigenvalue problem using the combination technique. The performance of different combination schemes is used on a test problem and evaluated with respect to accuracy in retrieving an eigenvalue and the computational effort required. This evaluation suggests, that the sparse grid combination technique is a feasible method to compute eigenvalues of the gyrokinetic eigenvalue problem.
    Procedia Computer Science 01/2013; 18:449–458. DOI:10.1016/j.procs.2013.05.208
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    ABSTRACT: In this report we present the necessary steps to install and run the code GENE into MareNostrum. Several profiling analysis and performance test were realized in order to prove the code behaviour. We report some code's difficulties found in our architecture.
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    ABSTRACT: Plasma microinstabilities are one of the key physics problems on the way to efficient power plants based on nuclear fusion. They cause anomalous heat and particle transport which significantly degrades the plasma confinement quality, thus preventing self-sustaining plasma burning in present-day experiments. Hence, extensive experimental studies are dedicated to understanding and predicting turbulence features. They are accompanied by numerical simulations which are typically based on the gyrokinetic theory. While experimental diagnostics are about to address the role of fine-scale turbulence within a bath of large-scale turbulence, nonlinear gyrokinetic codes are already able to investigate turbulent transport at a wide range of wave numbers simultaneously. However, such simulations covering several space and time scales self-consistently are computationally extremely demanding and thus need to be massively parallelized.
    12/2009: pages 491-501;
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