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DTSTAMP:20190719T085744Z
LOCATION:HG E 1.2
DTSTART;TZID=Europe/Stockholm:20190613T141500
DTEND;TZID=Europe/Stockholm:20190613T144500
UID:submissions.pasc-conference.org_PASC19_sess135_msa208@linklings.com
SUMMARY:Handling Huge Unstructured Meshes for Spectral Element Full Wavefo
 rm Modeling
DESCRIPTION:Minisymposium\nComputer Science and Applied Mathematics, Solid
  Earth Dynamics\n\nHandling Huge Unstructured Meshes for Spectral Element 
 Full Waveform Modeling\n\nHapla, Afanasiev, Boehm, van Driel, Krischer...\
 n\nIn 2018, the NASA InSight mission placed a highly sensitive seismometer
  on Mars' surface to investigate its interior. Due to strong 3D features, 
 elastic wave propagation simulations are crucial for data interpretation. 
 We show our implementation of the spectral-element method (SEM) is suitabl
 e for this purpose. To model Marsquakes quickly, we generate event-specifi
 c meshes tailored to the source position and estimated wavefield complexit
 y. While this reduces the computational complexity by an order of magnitud
 e, we cannot simply reuse the meshes from previous events. Moreover, at th
 e highest frequencies, the resulting discretized problems still have trill
 ions of spatial DOFs and hundreds of thousands of time steps. We make use 
 of PETSc DMPlex for common mesh storage and operations. It represents the 
 mesh topology in a flexible way, providing topological connectivity of ver
 tices, edges, faces and cells, crucial for SEM. Parallel mesh I/O is 
 key to keep scalability and overcome memory bounds. We employ HDF5 and kee
 p a distributed DMPlex representation right from the start-up phase and th
 rough the whole computation. To avoid redundant storage, disk operations, 
 and to conform to the XDMF format, only vertices and cells are stored in d
 atafiles, whereas the edges and faces are computed on the fly.
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