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Topics - Sofia

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Pathfinder / Pedestrian crowd flow calculations
« on: February 03, 2015, 09:18:48 am »

I am wondering if Pathfinder is appropriate to use in other types of crowd flow calculations, not nessecerilay in the case of egress.
For example to study the movement of people during the peak hours in a subway station etc.?

Best regards,


PyroSim / Visibility in pyrosim 2014
« on: April 11, 2014, 06:07:44 am »

How do I take take the visibility factor and mass extinction coefficient into account in pyrosim 2014?
There was a specific tag for this under "Reactions" in pyrosim 2012, but I can't find it in the new version of pyrosim.

Best regards,


Pathfinder / Maximum number of occupants
« on: August 05, 2013, 06:08:10 am »

I'm currently working on a model were the maximum number of occupants are 6000.
Is there any restrictions on how many occupants you can put in a model?

Kinds regards,

PyroSim / Simulate a fire by using spread rate
« on: March 25, 2013, 09:09:16 am »

I would like to simulate a fire by using the spread rate function. The fire will peak at a HRR of 1300 kW at t=160 s, during the next 60 s the HRR will be kept constant and after that the HRR will be reduced to 433 kW during the following 60 s and then the fire will be kept constant at this value.  I tried to use the ramp-up time function, see the values in the attached file. The first 160 s turned out as intended, the following part of the fire development did not turned out as intented, please see the the HHR curve in attached file. As you can see the reduction of the HRR accures after approximately 160 s and not 60 s as intentional.

Is there anyone who knows what I'm doing wrong?

I am grateful for all the help I can get.

Kind regards,


PyroSim / Extra walls created in FDS
« on: December 20, 2012, 06:16:10 am »

I recently been discovering something strange in pyrosim while using the multi-klick mode when I draw walls. It appears that "extra" walls, that are not visible in the pyrosim interface, are created in the FDS-file. These walls are visible in the smokeview file but not in the psm. file. To get rid of these walls I've randomly been deleting walls and suddenly the undesirable walls disappear, which leaves me to start drawing walls all over again. There should be an easier way to get rid of these extra walls, because "my way" is really time devastating. A picture of the extra walls are attached in this post.

Thanks for your help!

Pathfinder / Error message
« on: November 21, 2012, 06:49:05 am »

When I start a simulation in Pathfinder I get an error message looking like the attached file.
Does anyone know what this message means and what I should do to get my simulation running?

Thank you!

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