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1

PyroSim / Specifying a Chemical Formula : Ammonia

« on: December 22, 2022, 08:47:58 pm »

Dear all,

Although Ammonia is included in Table 15.1 "Pre-defined gas and liquid species" of FDS User guide, I cannot find this in Pre-defined species of Pyrosim(version 2018) as attached.

1) Is this problem what I have only ?

2) Can I create Ammonia by specifying a chemical formula "NH3" as attached?? I'm not sure this reslution is exactly same with real Ammonia properties.. Because I have studied for Methanol vapor dispersion with two cases, but the results seem to be different; one is Methanol of Predefined species and the other is CH3OH, chemical formula of Custom(Primitive). Of course all other input are same.

Thanks.

2

PyroSim / Dispersion analysis in Pyrosim

« on: December 06, 2022, 02:19:59 am »

Hello

I have been trying to conduct the hydrogen release and dispersion analysis in Pyrosim with making the Vent with Surface type as Supply.
In my understanding, hydrogen gas release is going upward through vertical vent outlet which is also upward direction.
However in pyrosim simulation, some of the gas cloud is going to downward unfortunately.

If anyone can help this issue, please let me know
I appreciate your help in advance.

Thanks