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Speeding Up Simulations By Slowing Down Particles: Speed-Limited Particle-In-Cell Simulation | Gregory R. Werner
; John R. Cary
; | Date: |
25 Nov 2015 | Abstract: | Particle-in-cell (PIC) simulation is often impractical for the same reason
that it is powerful: it includes too much physics. Sometimes the mere ability
to simulate physics on small length or time scales requires those scales to be
resolved (by the cell size and timestep) to avoid instability, even when the
effects at those scales contribute negligibly to the phenomenon motivating the
simulation. For example, a timestep larger than the inverse plasma frequency
will often result in unphysical growth of plasma oscillations, even in
simulations where plasma oscillations should not arise at all. Larger timesteps
are possible in simulations based on reduced physics models, such as MHD or
gyrokinetics, or in simulations with implicit time-advances. A new method,
speed-limited PIC (SLPIC) simulation, allows larger timesteps without reduced
physics and with an explicit time-advance. The SLPIC method slows down fast
particles while still accurately representing the particle distribution. SLPIC
is valid when fields and distribution functions change slowly compared with the
desired timestep; SLPIC is useful when that timestep is much larger than that
allowed by standard PIC (and when alternative approximations do not include
enough physics). Speed-limited PIC can be implemented with relatively localized
modifications of a standard PIC code. | Source: | arXiv, 1511.8225 | Services: | Forum | Review | PDF | Favorites |
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