Hello sir,
In the setup file, there is a item like "maxdim = 1", and what meaning is it?
Many thanks.
about setup file
-
ariel.stein
- Posts: 660
- Joined: November 7th, 2012, 3:14 pm
- Registered HYSPLIT User: Yes
Re: about setup file
MAXDIM is the maximum number of pollutants that can be attached to one
particle. Otherwise, if multiple pollutants are defined they are released as individual
particles. This feature is usually required with chemical conversion modules, which are not
part of the standard distribution. However, the species 1->2 conversion option will
automatically set MAXDIM=2. Both the standard point source and emissions file
input routines are enabled to release multiple species on the same particle. In addition,
for the daughter product calculation MAXDIM needs to be set equal to the number of daughter nuclides.
Setting MAXDIM greater than one forces all the species on the same particle, with the limitation that
the number of defined pollutants must equal MAXDIM. No other combinations are permitted.
The advantage of this approach is that not as many particles are required for the calculation
as in the situation where every pollutant is on its own particle. The limitation is that each
species on the particle should have comparable dynamic characteristics, such that they are all
gases or have similar settling velocities; otherwise the transport and dispersion simulation
would not be very realistic. In the case of multiple species defined on a single particle, the
gravitational settling routine will use the characteristics of the last defined pollutant to
compute settling for that particle. Deposition, decay, and other removal processes are still
handled for independently for each pollutant on that particle.
particle. Otherwise, if multiple pollutants are defined they are released as individual
particles. This feature is usually required with chemical conversion modules, which are not
part of the standard distribution. However, the species 1->2 conversion option will
automatically set MAXDIM=2. Both the standard point source and emissions file
input routines are enabled to release multiple species on the same particle. In addition,
for the daughter product calculation MAXDIM needs to be set equal to the number of daughter nuclides.
Setting MAXDIM greater than one forces all the species on the same particle, with the limitation that
the number of defined pollutants must equal MAXDIM. No other combinations are permitted.
The advantage of this approach is that not as many particles are required for the calculation
as in the situation where every pollutant is on its own particle. The limitation is that each
species on the particle should have comparable dynamic characteristics, such that they are all
gases or have similar settling velocities; otherwise the transport and dispersion simulation
would not be very realistic. In the case of multiple species defined on a single particle, the
gravitational settling routine will use the characteristics of the last defined pollutant to
compute settling for that particle. Deposition, decay, and other removal processes are still
handled for independently for each pollutant on that particle.