Team Magique-3D

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Section: New Results

Simulation of seismic wave propagation in an asteroid based upon a non-blocking MPI spectral-element method

Participants : Dimitri Komatitsch, Roland Martin, Céline Blitz, Nicolas Le Goff, Philippe Lognonné.

In order to better understand the internal structure of asteroids orbiting in the Solar system, and then the response of such objects to impacts, seismic wave propagation in asteroid 433-Eros is performed numerically based on a spectral-element method at seismic frequencies from 0 Hz to 5 Hz. In the year 2000, the NEAR Shoemaker mission to Eros has provided images of the asteroid surface, which contains numerous fractures that likely extend to its interior. Our goal is to be able to propagate seismic waves resulting from an impact in such models. For that purpose we create and mesh both homogeneous and fractured models with a highly-dispersive regolith layer at the surface using the CUBIT mesh generator developed at Sandia National Laboratories (USA). The unstructured meshes are partitioned using the METIS software package in order to minimize edge-cuts and therefore optimize load balancing in our parallel non-blocking MPI implementation. In [76] and [23] we perform actual simulations and show that we can obtain good performance levels and good scaling when we implement overlapping of communications with calculations. Calculations were performed at CINES in Montpellier, France.


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