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TAPIR Seminar

Friday, January 24, 2020
2:00pm to 3:00pm
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Cahill 370
SpECTRE: Rethinking simulations of relativistic magnetohydrodynamics
Nils Deppe, Graduate Student, Cornell Center for Astrophysics and Planetary Science (CCAPS), Cornell University,

Numerical simulations of relativistic magnetohydrodynamics are essential for understanding astrophysical problems like binary neutron star mergers, accretion onto a black hole, and core collapse supernova explosions. To date, such simulations use low-order numerical methods that do not guarantee physical requirements such as positivity of the pressure and density. These simulations are computationally expensive because of the high resolution they need. High-order methods allow for improved accuracy at lower resolutions, making for cheaper and more accurate simulations. I will give an overview of the next-generation astrophysics code, SpECTRE (github.com/sxs-collaboration/spectre), and the novel numerical methods being employed. SpECTRE uses discontinuous Galerkin methods combined with adaptive-order finite-difference methods to achieve high-order accuracy and robust shock capturing, while guaranteeing positivity preservation. Additionally, these numerical methods are well-suited for task-based parallelism, which SpECTRE uses to achieve efficient scaling to exascale supercomputers.

For more information, please contact JoAnn Boyd by phone at x4280 or by email at joann@caltech.edu.