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Forum moved to https://help.thunderheadeng.com/support/discussions. This forum site will be read-only for a while and eventually brought offline.  All new posts should be made on the new "help" site.

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Messages - Bryan Klein

Pages: 1 [2] 3 4 ... 11
16
Pathfinder / Re: Pathfindel 2018 is not working properly
« on: May 21, 2021, 05:24:04 pm »
My guess is that the model geometry is very far away from the 0,0,0 point in the model.  This can cause precision errors in the simulation and results visualization.
If this is the problem, then you can select everything in the model and use the move tool to move the model close to the origin point.

https://support.thunderheadeng.com/docs/pathfinder/2021-2/user-manual/#_moving


17
Pathfinder / Re: Can a wheelchair enter the elevator?
« on: May 21, 2021, 05:18:05 pm »
It should be able to enter if there is enough 'room' in the elevator to fit the amount of space that the wheelchair consumes.  Please see the 'Corresponding Occupant Count' parameter in the Vehicle Shapes dialog. https://support.thunderheadeng.com/docs/pathfinder/2021-2/user-manual/#_vehicle_shapes

18
Pathfinder / Re: Standard sample size in Monte Carlo Simulations
« on: May 21, 2021, 04:15:37 pm »
You might be interested in this recently released paper on the topic. https://link.springer.com/article/10.1007/s10694-021-01134-w

19
Pathfinder / Re: Impact of FDS results on occupant movement
« on: May 21, 2021, 03:56:40 pm »
There is a newer feature in Pathfinder to have agent automatically slow down in smoke.
https://support.thunderheadeng.com/docs/pathfinder/2021-2/user-manual/#_importing_fds_output_data
https://support.thunderheadeng.com/docs/pathfinder/2021-2/technical-reference-manual/#_occupant_slowing_in_smoke

They will not avoid smoke yet, and doors won't close to prevent movement through a smoke filled room.

20
Pathfinder / Re: Visibility Threshold for tenability assesment
« on: May 21, 2021, 03:56:15 pm »
There is not a specific threshold, this would be up to engineering judgement.

There is a newer feature in Pathfinder to have agent automatically slow down in smoke.
https://support.thunderheadeng.com/docs/pathfinder/2021-2/user-manual/#_importing_fds_output_data
https://support.thunderheadeng.com/docs/pathfinder/2021-2/technical-reference-manual/#_occupant_slowing_in_smoke

They will not avoid smoke yet, and doors won't close to prevent movement through a smoke filled room.

21
PyroSim / Re: Is this a good program to simulate the flame front of a forest fire?
« on: May 21, 2021, 03:52:40 pm »
Please see this presentation: https://www.femtc.com/events/2020/d1-10-mcgrattan/

22
PyroSim / Re: What is mean Filed about pyrosim result excel file
« on: May 21, 2021, 03:51:41 pm »
This is covered in the FDS User Guide.

23
PyroSim / Re: how to measure incident heat flux?
« on: May 21, 2021, 03:51:12 pm »
Use the gas phase quantity INTEGRATED INTENSITY.

24
PyroSim / Re: How to set the direction of the exhaust vent?
« on: May 21, 2021, 03:49:56 pm »
HVAC vents would work well for this. https://support.thunderheadeng.com/docs/pyrosim/2021-2/user-manual/#_hvac_vents

25
PyroSim / Re: Different Ambient Temperature
« on: May 21, 2021, 03:48:19 pm »
Yes, you can use both the 'ambient' settings in the Simulation Parameters and 'INIT' records for Initialization regions.

https://support.thunderheadeng.com/docs/pyrosim/2021-2/user-manual/#_environment

https://support.thunderheadeng.com/docs/pyrosim/2021-2/user-manual/#_init_regions

26
PyroSim / Re: SLCF, ID, and FYI
« on: May 21, 2021, 03:43:39 pm »
You are correct, PyroSim does not currently provide an input field for ID of an SLCF record.
I have created a feature request for this to be added for 2D and 3D Slices.

27
PyroSim / Re: Surface Temperature
« on: May 21, 2021, 03:35:10 pm »
You will need the wall obstruction to have a Layered Surface applied to it.  This surface should include a material that has thermophysical properties set to match the materials that will be conducting heat.  Then you can use solid phase devices to measure surface, back wall and in-depth temperatures.

28
PyroSim / Re: Error - The QUANTITY MPUV_Z requires liquid droplets
« on: May 21, 2021, 03:33:15 pm »
Gas or liquid?

29
PyroSim / Re: Overlay=false
« on: May 21, 2021, 03:32:43 pm »
Yes, you could add this to the 'Advanced' tab of the obstruction properties dialog.


30
PyroSim / Re: Soot Yield vs Mass Fractions
« on: May 21, 2021, 03:26:40 pm »
Quote from: Karthik Kayaroganam on April 06, 2021, 10:24:09 pm
I would like to enquire if the setting of the soot mass fraction as such is equivalent to the setting of soot yield as 0.1 in the byproducts?

No, mass fraction of a supply air flow is not the same as the mass fraction of the fuel that converts to soot as a byproduct of combustion.

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