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- Particle_Mesh abstract "Particle Mesh (PM) is a computational method for determining the forces in a system of particles. These particles could be atoms, stars, or fluid components and so the method is applicable to many fields, including molecular dynamics and astrophysics. The basic principle is that a system of particles is converted into a grid (or "mesh") of density values. The potential is then solved for this density grid, and forces are applied to each particle based on what cell it is in, and where in the cell it lies.Various methods for converting a system of particles into a grid of densities exist. One method is that each particle simply gives its mass to the closest point in the mesh. Another method is the Cloud-in-Cell (CIC) method, where the particles are modelled as constant density cubes, and one particle can contribute mass to several cells.Once the density distribution is found, the potential energy of each point in the mesh can be determined using Fourier transform techniques[citation needed]. Thus it is faster to do a PM calculation than to simply add up all the interactions on a particle due to all other particles for two reasons: firstly, there are usually fewer grid points than particles, so the number of interactions to calculate is smaller, and secondly the grid technique permits the use of Fourier transform techniques to evaluate the potential, and these can be very fast.PM is considered an obsolete method as it does not model close interaction between particles well. It has been supplanted by the Particle-Particle Particle-Mesh method, which uses a straight particle-particle sum between nearby particles in addition to the PM calculation.".
- Particle_Mesh wikiPageID "17098963".
- Particle_Mesh wikiPageRevisionID "570430119".
- Particle_Mesh hasPhotoCollection Particle_Mesh.
- Particle_Mesh subject Category:Computational_physics.
- Particle_Mesh comment "Particle Mesh (PM) is a computational method for determining the forces in a system of particles. These particles could be atoms, stars, or fluid components and so the method is applicable to many fields, including molecular dynamics and astrophysics. The basic principle is that a system of particles is converted into a grid (or "mesh") of density values.".
- Particle_Mesh label "Particle Mesh".
- Particle_Mesh sameAs m.0421m2p.
- Particle_Mesh sameAs Q7140485.
- Particle_Mesh sameAs Q7140485.
- Particle_Mesh wasDerivedFrom Particle_Mesh?oldid=570430119.
- Particle_Mesh isPrimaryTopicOf Particle_Mesh.