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DTSTART;TZID=Europe/Stockholm:20230626T163000
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UID:submissions.pasc-conference.org_PASC23_sess154_msa167@linklings.com
SUMMARY:Parallel-In-Time Integration with Particle-In-Fourier Schemes
DESCRIPTION:Minisymposium\n\nSriramkrishnan Muralikrishnan and Robert Spec
 k (Forschungszentrum Jülich)\n\nParticle-In-Fourier (PIF) schemes are attr
 active for long-time integration kinetic plasma simulations as they conser
 ve charge, momentum and energy, exhibit a variational structure, do not ha
 ve aliasing and have excellent stability properties. However, they are typ
 ically more expensive than the commonly used Particle-In-Cell (PIC) scheme
 s due to the requirement of non-uniform DFTs or FFTs. In this talk, we pro
 pose a Parareal-based parallel-in-time integration method for PIF schemes 
 with PIF as the fine propagator and standard PIC scheme as the coarse prop
 agator towards the goal of performing long-time integration simulations wi
 th PIF schemes. The resulting scheme is implemented on the performance por
 table library IPPL and we numerically investigate the convergence of it wi
 th respect to the discretization parameters of PIF and PIC. We present spa
 ce-time parallel simulations with the proposed scheme for a variety of ben
 chmarks such as the Landau damping, the two-stream instability and the Pen
 ning trap on A100 multi-GPUs on the JUWELS Booster supercomputer.\n\nDomai
 n: Engineering\n\nSession Chair: Jeremy Johnathan Williams (KTH Royal Inst
 itute of Technology)
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