Particle-in-cell method vs. PM/PPPM methods

AI Thread Summary
The discussion focuses on the particle-in-cell (PIC) method developed by Harlow and Evans in the 1950s, with references to Hockney and Eastwood's book, which outlines different simulation models: particle-particle (PP), particle-mesh (PM), and particle-particle particle-mesh (PPPM). The main inquiry is about the distinctions between these models, particularly how PIC fits into this framework. It is noted that PIC is classified as a PM method, while PPPM is recognized as significantly different due to its consideration of direct interactions between nearby particles. The conversation concludes with an acknowledgment of the differences between PPPM and PIC, affirming the clarity provided in the discussion.
mr-anonymouse
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I'm doing a paper on the particle-in-cell method, which was designed by Harlow and Evans in the mid 50s. But I'm reading Hockney and Eastwood's book Computer Simulation Using Particles in which they describe their models, and term them PP (particle-particle), PM (particle-mesh), and PPPM (particle-particle - particle-mesh). they also refer to the PIC in the book a couple of times, but in principle i don't see how their workings are different. could someone please explain why and how they're different?
 
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I would classify PIC as a PM method. I'm not sure there are significant differences. PPPM however is quite different, as direct particle-particle interactions are also considered for nearby particles.
 
Thanks for your reply! I see what you mean between PPPM and PIC beind different. Thanks for the help!
 

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