## Advanced / Configuration Setup / Input and Output of Particle Files

Particle File Initialization Options

NINIT sets the type of initialization performed. When set to "0" no particle initialization occurs even if the "PINPF" file is found in the root directory. A value of "1" reads the file only during the initialization process. No initialization will occur if the time of the particle dump does not match the time of the model initialization. A value of "2" will check the file each hour during the simulation, and if the times match, the particles will be added to those already contained in the simulation. A value of "3" is similar to the previous case, except the particles in the file replace all the particles in the simulation.

PINPF sets the default name PARINIT for the particle input file. Note that particle files are just a dump of all the pollutants tracked by the model at a particular time and the file can consist of either puffs, particles, or a combination of both.

Particle File Output Options

NDUMP can be set to dump out all the particle/puff points at selected time intervals to a file called PARDUMP. This file can be read from the root directory at the start of a new simulation to continue the previous calculation. Valid NDUMP settings are [0] for no I/O or [hours] to set the number of hours from the start of the simulation at which all the endpoint positions will be written to the file. The file must exist in the root directory and NDUMP>0 for the model to initialize pollutant particles from the file. NDUMP is used in conjunction with NCYCL (see below).

NCYCL sets the repeat interval at which the PARDUMP file is to be written after the first write at hours NDUMP. For instance, in a multi-day simulation, one application would be to set NDUMP=24 and NCYCL=24 to output all points at the end of every simulation day. If the model were to crash unexpectedly, the simulation could be restarted from the last PARDUMP output.

POUTF is default name for the particle dump output file PARDUMP.

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