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number of particles in STILT emulation mode
Posted: March 26th, 2015, 10:58 pm
by daved
It seems like when I run the dispersion model in STILT emulation mode, I wind up with only 720 particles. The reason I'm running in this mode is that I want to output the particle locations as ASCII data, but it seems like I'm locked into 180 particles per hour of emission. When I comment out the ICHEM variable in the .sh script, I get the proper number of particles.
Re: number of particles in STILT emulation mode
Posted: March 27th, 2015, 9:33 am
by ariel.stein
What is the number of particles (NUMPAR) you are releasing?
Re: number of particles in STILT emulation mode
Posted: March 27th, 2015, 9:40 am
by ariel.stein
Also, can you please send me your CONTROL and SETUP.CFG ?
Re: number of particles in STILT emulation mode
Posted: April 2nd, 2015, 12:30 pm
by daved
I sent an email and I should have posted this info on the forums. Sorry about that.
NUMPAR = 500
Files are attached. It seems like deposition is not included when I run in STILT emulation mode.
Re: number of particles in STILT emulation mode
Posted: April 2nd, 2015, 2:32 pm
by ariel.stein
You are getting a different number of particles because the time step is different in each run. The STILT emulation mode forces the time step to 1 minute.
Also, when you setup your run to emulate the STILT mode, each particle's mass is set to a constant value determined by NUMPAR.
For your particular runs you will need to increase the NUMPAR. A low number of particles will give you a very noisy concentration/footprint field.
On the other hand, deposition is not included because this module was originally developed for gases such as CO2 or CH4. I am not aware of any applications using aerosols.