Particle Parameters

ParticleBoundaryType (external)
The boundary condition imposed on particles. At the moment, this parameter is largely ceremonial as there is only one type implemented: periodic, indicated by a 0 value. Default: 0
ParticleCourantSafetyNumber (external)
This somewhat strangely named parameter is the maximum fraction of a cell width that a particle is allowed to travel per timestep (i.e. it is a constant on the timestep somewhat along the lines of it’s hydrodynamic brother). Default: 0.5
NumberOfParticles (obsolete)
Currently ignored by all initializers, except for TestGravity and TestGravitySphere where it is the number of test points. Default: 0
NumberOfParticleAttributes (internal)
It is set to 3 if either StarParticleCreation or StarParticleFeedback is set to 1 (TRUE). Default: 0
ParallelParticleIO (external)
Normally, for the mpi version, the particle data are read into the root processor and then distributed to separate processors. However, for very large number of particles, the root processor may not have enough memory. If this toggle switch is set on (i.e. to the value 1), then Ring i/o is turned on and each processor reads its own part of the particle data. More I/O is required, but it is more balanced in terms of memory. ParallelRootGridIO and ParallelParticleIO MUST be set for runs involving > 64 cpus! See also ParallelRootGridIO in I/O Parameters. Default: 0 (FALSE).
ParticleSplitterIterations (external)
Set to 1 to split particles into 13 particles (= 12 children+1 parent, Kitsionas & Whitworth (2002)). This should be ideal for setting up an low-resolution initial condition for a relatively low computational cost, running it for a while, and then restarting it for an extremely high-resolution simulation in a focused region. Currently it implicitly assumes that only DM (type=1) and conventional star particles (type=2) inside the RefineRegion get split. Other particles, which usually become Star class objects, seem to have no reason to be split. Default: 0
ParticleSplitterChildrenParticleSeparation (external)
This is the spacing between the child particles placed on a hexagonal close-packed (HCP) array. In the unit of a cell size which the parent particle resides in. Default: 1.0