Efficient parallelization for volume-coupled multiphysics simulations on hierarchical Cartesian grids

One of the main challenges for multiphysics simulations of volume-coupled problems is data exchange, which becomes a serious bottleneck for large-scale applications executed on distributed memory computer architectures. Unlike surface coupling, the transfer of volumetric information via network comm...

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Veröffentlicht in:Computer methods in applied mechanics and engineering Jg. 352; S. 461 - 487
Hauptverfasser: Schlottke-Lakemper, Michael, Niemöller, Ansgar, Meinke, Matthias, Schröder, Wolfgang
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Amsterdam Elsevier B.V 01.08.2019
Elsevier BV
Schlagworte:
Aeroacoustics
Aerodynamics
Algorithms
Computational fluid dynamics
Computer simulation
Coupling
Data exchange
Discontinuous Galerkin spectral element method
Distributed memory
Domain decomposition methods
Finite element method
Fluid flow
Hierarchical Cartesian mesh
Multiphysics simulation
Parallel efficiency
Parallel processing
Solvers
Turbulent jets
Volume coupling
Volume coupling
Hierarchical Cartesian mesh
Multiphysics simulation
Discontinuous Galerkin spectral element method
Parallel efficiency
ISSN:0045-7825, 1879-2138
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Zusammenfassung:One of the main challenges for multiphysics simulations of volume-coupled problems is data exchange, which becomes a serious bottleneck for large-scale applications executed on distributed memory computer architectures. Unlike surface coupling, the transfer of volumetric information via network communication can be too inefficient. To circumvent this problem, a new concept based on a joint hierarchical mesh is proposed, where the coupled solvers use different cells of a single shared grid. A domain decomposition method based on space-filling curves guarantees that all coupling data can be exchanged locally by in-memory operations. Furthermore, the interleaved execution of the solvers ensures that there is no additional overhead due to communication barriers. To demonstrate the efficiency of the presented method for realistic three-dimensional problems, it is used to predict the acoustic field of a turbulent jet in a direct-hybrid simulation, in which fluid dynamics and aeroacoustics are directly coupled. The results confirm the good parallel scalability of the approach and show the design of the coupling algorithm to be more efficient than a standard hybrid flow-aeroacoustics scheme coupled via disk I/O. •A flexible approach for volume-coupled 3D multiphysics simulations is presented.•Each coupled system uses different cells of a shared hierarchical Cartesian mesh.•High parallel efficiency is achieved by in-memory data transfers between the solvers.•The new method is validated by a flow-aeroacoustics simulation of a 3D turbulent jet.•Performance results show faster execution due to improved parallelization properties.
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ISSN:0045-7825
1879-2138
DOI:10.1016/j.cma.2019.04.032