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@PHDTHESIS{SchlottkeLakemper:842369,
      author       = {Schlottke-Lakemper, Michael},
      title        = {{A} direct-hybrid method for aeroacoustic analysis},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {Verlag Dr. Hut},
      reportid     = {FZJ-2018-00610},
      isbn         = {978-3-8439-3100-7},
      pages        = {xviii, 91 pages},
      year         = {2017},
      note         = {Dissertation, RWTH Aachen, 2017},
      abstract     = {Hybrid computational fluid dynamics (CFD) - computational
                      aeroacoustics (CAA) schemes are the standard method for
                      aeroacoustics simulations. In this approach, it is necessary
                      to exchange 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: Firstly, the
                      required disk space becomes large and reaches hundreds of
                      terabytes for a single simulation. Added to that, 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 which
                      inherently supports local mesh refinement. To demonstrate
                      the capabilities of the new scheme, the aeroacoustic field
                      of a co-rotating vortex pair is computed and the
                      flow-induced noise emissions of a turbulent, isothermal jet
                      are predicted. The results show that the direct-hybrid
                      method is able to accurately capture the sound pressure
                      field and that it is particularly suitable for efficient,
                      highly parallel simulations. Furthermore, in comparison to
                      the classic hybrid method with data exchange via disk I/O,
                      the novel approach shows superior performance when scaling
                      to thousands of cores.},
      keywords     = {Strömungsakustik (gnd)},
      ddc          = {620},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / PhD no Grant - Doktorand ohne besondere
                      Förderung (PHD-NO-GRANT-20170405)},
      pid          = {G:(DE-HGF)POF3-511 / G:(DE-Juel1)PHD-NO-GRANT-20170405},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/842369},
}