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 on: Today at 08:58:07 am 
Started by agro - Last post by agro
How to simulate model ingress in a building ?
Its posible create model ingress in Pathfinder?

 on: Today at 02:24:20 am 
Started by fireenggiman - Last post by fireenggiman
Hello Forum

I have been working on a couple of projects involving PyroSim. I was able to finish the model and start the FDS process. But both the models stopped in the middle after running for almost 3 days. So, I am kind of stuck in understanding why that happened.
I am totally new to using PyroSim and I don't know where to start. I tried checking for the Max. CFL Numbers in the '.out' file as I read that the simulation will stop if the Max. CFL Number is above 1. But in the output files for both of my models, the CFL Numbers were less than 1. So, I would really appreciate if anyone can help me in understanding the '.out' and '.end' files of the FDS.



 on: August 01, 2020, 08:03:57 am 
Started by 4rthur - Last post by 4rthur
is there any source where I can find best reaction composition for modelling a car fire?

 on: July 30, 2020, 04:20:12 am 
Started by alina - Last post by alina
Hello all,
Is there a possibility to specify name for each floor instead of elevation while viewing results?


 on: July 28, 2020, 02:54:09 pm 
Started by Perera - Last post by Dave McGill

If you increase the value of the extinguishing coeficient then the fire will diminish more, and may go out. Just be aware that the fire is going out because you told it to go out with an arbitrarily large value of E_COEFFICIENT.

If you haven't done so, then read about E_COEFFICIENT in the FDS Users Guide.

 on: July 28, 2020, 09:23:36 am 
Started by Perera - Last post by Perera
Hello Everyone,

I have modeled a fire which is to be ignited by a burner surface (burner surface only for first 10 seconds), to be spread thereon and to be extinguish with the sprinklers.
But after sprinklers activated the fire getting reduced but not extinguish completely. I have run the simulation for 250 seconds but fire continue at a lower level not getting extinguish.
Is there any possibility in Pyrosim to model a fire that get extinguish completely with sprinklers Or have I defined the values incorrectly?

And please find the below link for the model (.psm) for you reference


 on: July 27, 2020, 04:13:42 am 
Started by Perera - Last post by Perera
Thanks Dave,

My model was initially modeled through Revit and I have made a mistake when exporting to CAD. Below quote helped me to solve the problem.

"In the Modify DWG/DXF Export Setup dialog, select the Solids tab, and select ACIS solids. This option allows PyroSim to import objects as solid obstructions rather than treating each exported face as a thin obstruction"

Thanks again   :)

 on: July 27, 2020, 12:29:47 am 
Started by Csaba_90 - Last post by Csaba_90
I am using Pyrosim v2020.20527. When running a simulation with ESFR sprinklers (or with normal sprinklers) protecting a multifunctional sport hall the simualtion stops (depending on the activation of sprinklers) with the following error message:
WARNING Delta TMP_G. Mesh: 23 Particle: 1
WARNING TMP_G_N < TMP_D_N. Mesh:23 Particle: 1
(I'm looking for the problem source and find that the message means that during the temperature update of a particular grid cell in Mesh 23, the droplet whose index is 1 caused the cell gas temperature (TMP_G) to change too rapidly.)
This error message string is repeated several times for differt particle IDs. The common event the calculation stops for a while (with this error message) and it continues. At random event when the error message occur the calculation stays (at that moment when the message apeear) for days.

I couldn't find the correct solution so far. However i tried the following according to the fds user guide:
- on the MISC. line set PARTICLE_CFL= TRUE (the result was the calculation extremely slowed about 1100 sec the problem occured)
- changed the PARTICLES_PER_SECOND on the prop line from 5000 to 20000 (same result)

This problem didnt occured on the previous versions. Running the case with MPI. Does anyone has the same problem or the correct solution?

Thank you.

 on: July 24, 2020, 03:18:18 pm 
Started by Perera - Last post by Dave McGill
I started it, and it ran.

 on: July 24, 2020, 10:01:05 am 
Started by Andrés Felipe Cardoso - Last post by Andrés Felipe Cardoso
Thanks Dave, your timely response has been very helpful, thank you very much for your kindness.


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