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Messages - Bryan Klein

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Pathfinder / Re: Navigating 3D View Feature Request
« on: August 28, 2019, 03:01:09 pm »

Thank you for the feedback, I think you will be happy to learn that if you use the 'Select and Manipulate Objects' tool (instead of 3D Orbit), then the left mouse button is used to select/manipulate objects (and drag select), right-click drag enables 3D orbit mode, middle mouse button (pressing the scroll wheel) enables the pan tool, and scrolling the wheel zooms in and out on the model.

Also, we are very close to releasing a new feature for user-customizable Keyboard Shortcuts.

- Bryan


You should either change the backing setting or edit the geometry to work with the 'exposed' backing type.


Pathfinder / Re: Occupants moving upstairs
« on: August 15, 2019, 10:36:47 am »

Please email the Pathfinder model to so we can review the issue.


Pathfinder / Re: Feature Requests
« on: July 30, 2019, 08:35:56 am »
Thank you for all of these great suggestions!  I will convert them into feature requests in our system.

PyroSim / Re: BAT
« on: July 19, 2019, 03:00:57 pm »
Many people write scripts to run a collection of FDS files from the command line.
Thunderhead does not provide support for this use case, but it's not uncommon to run simulations this way.

Here is a basic example from

if you are running on windows then create a file named runcases.bat (using the .bat extension is the key).

Put in this file:

fds case1.fds
fds case2.fds
fds casen.fds

To run this "batch" file type runcases at a command line.

You would need to add the path to fds.exe (bundled with PyroSim) into your system environment variables.
For the default installation, the path to fds.exe is "C:\Program Files\PyroSim 2019\fds".

Pathfinder / Re: The model was struck with lastest version
« on: July 19, 2019, 02:37:45 pm »

It's difficult to understand the problem from your post here.
Please email your Pathfinder file to


Pathfinder / MOVED: wind data
« on: July 15, 2019, 09:27:42 am »

PyroSim / Re: wind data
« on: July 15, 2019, 09:26:44 am »
Please see section "12.5 Special Flow Profiles" in the FDS User Guide.

PyroSim / Re: Warning: Y_G_N > Y_EQ
« on: July 11, 2019, 10:26:38 am »
Have you tried running this simulation in the latest version of PyroSim?

PyroSim / Re: Mesh fills up with smoke
« on: July 11, 2019, 10:24:44 am »
How is the smoke supposed to leave the mesh?

PyroSim / Re: Issues while importing geometry
« on: July 11, 2019, 10:24:15 am »
Can you attach the DWG file for testing?

PyroSim / Re: No Airflow through Fans
« on: July 11, 2019, 10:20:13 am »
On our forum, it is usually best to post your PyroSim file, as details can be lost in the conversion to FDS input.
On the FDS-SMV Discussion Group, they prefer FDS input files.

From what I see in your file, you don't have vents connected to the top or bottom of your Fans and the endpoints are set to 'Ambient'.
Vents are how the HVAC network connects to the FDS CFD simulation, they provide an interface between the flow simulation and what happens inside the HVAC submodel.

PyroSim / Re: Vents
« on: July 11, 2019, 10:04:24 am »
Since the current version of FDS requires all surfaces to align to an axis, you must figure out a way to represent the vent in this way.

Some Ideas:
- Stair-step the vent, breaking it down into multiple sections (vents) that are controlled together and follow the slope of the roof line.
- Recess a horizontal vent into a cutout in the roof. Where the horizontal vent lies in the midpoint of where the sloped vent would be.

I am sure people could come up with other ideas, but these two come to my mind first.


Pathfinder / Re: Occupants hesitating on stairwells
« on: June 25, 2019, 08:47:27 am »
There could be a few issues here to cause strange movement in Pathfinder. Could you both send your Pathfinder models to so that we can help find a solution?

Pathfinder / Re: Problem importing dwg file
« on: June 25, 2019, 08:45:48 am »
It sounds to me like the drawing lines are very far away from 0,0,0 in the dwg file.  After import into Pathfinder look in 2D Top View, at the end of a line closest to 0,0,0 see the X,Y values at the bottom of the modeling window.  If they are very large write them down.  Then, select all imported dwg elements and click the move tool in the property panel at the top, enter the X,Y numbers in the correct fields, but add a negative sign in front of them to move everything closer to the origin point in Pathfinder.  This should resolve any strange graphical artifacts that show up when things are so far away from the origin point (from loss of precision in the floating point data).


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