Particle heights

[federica]

Hello,

I'd like to know if it is possible to extract in a text file the information about the particles altitudes contained in the binary file PARDUMP.

Thanks in advance for any suggestion,
Regards,

Federica

[ariel.stein]

There is a program called par2asc.exe located in the exec directory that will convert your PARDUMP file to a text file.

[federica]

Thank you. In the PARDUMP file is it possile to set the flag 'Repeat interval (hrs)' equal to 0.5 (less than one hour). I'm trying to do this but I get an error related to this flag.

Many Thanks
Regards

Federica

[ariel.stein]

You can set NDUMP to a negative number and the model will output the particle positions for each time step up to the ABS(NDUMP) hours.

Here you have additional information about setting NDUMP and NCYCL

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. A negative
value for NDUMP will dump out the particle/puff points at each model time step from the start of
the simulation up to NDUMP hours. 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. If NCYCL is less than
zero, then the PARDUMP file is over-written, rather than appended, at that interval. This means
that the file will always contain one time period, a more compact file for initialization purposes.
Also note that if NDUMP is negative, the NCYCL field is ignored.

[federica]

Thank you. So if I have a simulation that lasts 12 hours and I set NDUMP=-12 and NCYCL=0 I should get the particle positions for each time step? Is this correct?

Many thanks

[ariel.stein]

Yes, that is correct.