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Hello, I have a problem modelling pollutant flow. I have a
simple one zone-building with inhabitants producing CO2. I use this
concentration to control a fan. The problem is that when I run the simulation,
I get the following warning: ***** WARNING
***** UNIT 37 TYPE 56, TIME = 4.188E+00 COMIS MESSAGE
***** WARNING ***** Pollutant
transport solver : Small timestep needed (Tau <
10 sec), but is limited to 1 sec appearing at
every time step. But, when I decrease the time step below 56.25 sec (0.5^6*1hr),
I get a range check error during the simulation (the first couple of hours are
plotted before the error). Does anyone have experience with this? What causes
the error? And is such a small time step always needed when simulating
pollutants or does it depend on e.g. the zone volume? Thanks a lot, Stefan de Kool Cauberg-Huygen Raadgevende Ingenieurs Lokatie Rotterdam |