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28 March 2024
 
  » arxiv » 1511.8225

 Article overview


Speeding Up Simulations By Slowing Down Particles: Speed-Limited Particle-In-Cell Simulation
Gregory R. Werner ; John R. Cary ;
Date 25 Nov 2015
AbstractParticle-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
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