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000842367 0247_ $$2doi$$a10.1016/j.compfluid.2016.12.001
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000842367 1001_ $$0P:(DE-Juel1)145740$$aSchlottke-Lakemper, Michael$$b0$$eCorresponding author$$ufzj
000842367 245__ $$aA fully coupled hybrid computational aeroacoustics method on hierarchical Cartesian meshes
000842367 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2017
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000842367 520__ $$aHybrid computational fluid dynamics (CFD) – computational aeroacoustics (CAA) schemes are the standard method for aeroacoustics simulations. This approach requires the exchange of information between the CFD and the CAA step, which is usually accomplished by storing acoustic source data. This data exchange procedure, however, poses two problems when such hybrid methods are used for large-scale problems with O(10^9) degrees of freedom: On the one hand, the required disk space becomes large and reaches hundreds of terabytes for a single simulation. On the other hand, the parallel scalability of the overall numerical scheme is limited by the available I/O bandwidth, which typically peaks between 5,000 and 10,000 cores. To avoid these problems, a highly scalable direct-hybrid scheme is presented, in which both the flow and the acoustics simulations run simultaneously. That is, all data between the two solvers is transferred in-memory, avoiding the restrictions of the I/O subsystem. Both solvers operate on a joint hierarchical Cartesian grid, which enables efficient parallelization and dynamic load balancing and inherently supports local mesh refinement. To demonstrate the capabilities of the new scheme, the aeroacoustic field of a co-rotating vortex pair is computed. The results show that the direct-hybrid method is able to efficiently predict the acoustic pressure field and that it is suitable for highly parallel simulations. Furthermore, in comparison to the hybrid method with data exchange via disk I/O, the novel approach shows superior performance when scaling to thousands of cores.
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000842367 536__ $$0G:(DE-Juel1)jhpc23_20151101$$aPrediction of jet engine noise (jhpc23_20151101)$$cjhpc23_20151101$$fPrediction of jet engine noise$$x2
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000842367 7001_ $$0P:(DE-HGF)0$$aYu, Hans$$b1
000842367 7001_ $$0P:(DE-HGF)0$$aBerger, Sven$$b2
000842367 7001_ $$0P:(DE-HGF)0$$aMeinke, Matthias$$b3
000842367 7001_ $$0P:(DE-HGF)0$$aSchröder, Wolfgang$$b4
000842367 773__ $$0PERI:(DE-600)1499975-4$$a10.1016/j.compfluid.2016.12.001$$gVol. 144, p. 137 - 153$$p137 - 153$$tComputers & fluids$$v144$$x0045-7930$$y2017
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