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Messages - Dave McGill

Pages: [1] 2 3 ... 9
1
PyroSim / Re: Leaking in two ways
« on: February 04, 2019, 01:15:22 pm »
Hi,

If you are using HVAC localized leakage, then the flow is unidirectional. If, for example, you want flow out the top of a vertical door gap  and in the bottom, then you have to create two leakage pathways and stack one on top of the other.

Dave

2
Here's the short version,

Model ->Edit Reactions -> Add from Library -> pick one of them

Dave

3
PyroSim / Re: ERROR: VENT 1 must be attached to a solid obstruction
« on: December 14, 2018, 07:17:52 am »
Hi,

Ensure that the surface of the solid obstruction and the plane of the vent line up with the mesh, and that the vent doesn't extend over the edge of the obstruction or extend into another obstruction.

Dave

4
PyroSim / Re: how to define water mist type of nozzle in pyrosim
« on: January 09, 2017, 05:03:18 pm »
Hi,

You can find examples here, in the Validation files.

https://github.com/firemodels/fds/tree/master/Validation/USCG_HAI

You will have to join the group in order to be able to download the files.

Dave

5
PyroSim / Re: SURF ID error
« on: November 07, 2015, 10:10:12 am »
Hi,

The code has some MATL properties, and some which are neither SURF nor MATL properties. See tables 17.12 and 17.26 in the FDS Users Guide for the list of respective properties.

Dave

6
PyroSim / Re: Reg : Open vent error
« on: November 05, 2015, 06:01:42 am »
The outside of a mesh.

7
PyroSim / Re: Reg : Open vent error
« on: November 04, 2015, 10:34:49 am »
As the error suggests, and OPEN vent must be on an exterior boundary.

Dave

8
PyroSim / Re: Pyrosim Smokeview Cad View Is Not Working
« on: October 24, 2015, 11:55:01 am »
Let's try another strategy. Download this from dropbox.  https://www.dropbox.com/s/en4wuyaor9jqc72/CAD%20import.zip?dl=0

It contains a 3D CAD file, a PyroSim file containing the imported CAD file, and a screenshot of the Smokeview preview. Everything works, and toggling "q" will display/hide the CAD features.

Let me know if you can import the CAD file, add a mesh, preview it in Smokeview, and toggle the CAD features.

Dave

9
PyroSim / Re: Pyrosim Smokeview Cad View Is Not Working
« on: October 23, 2015, 04:03:46 pm »
Can you attach the PyroSim file?

Dave

10
PyroSim / Re: Pyrosim Smokeview Cad View Is Not Working
« on: October 23, 2015, 01:55:41 pm »
Try hitting "q" on your keyboard.

Dave

11
PyroSim / Re: Sprinkler and Thermocouple Temperature Difference
« on: September 28, 2015, 04:00:20 am »
Hi Amit,

Please provide your PyroSim file.

Dave

12
PyroSim / Re: Seems like my fire don't get hot enough
« on: September 21, 2015, 02:22:39 pm »
As shown above, the temperature exceeds 500 C, until the window opens, and the smoke layer escapes.

Put a slice flie in the YZ plane directly through the fire.

Dave

13
PyroSim / Re: Seems like my fire don't get hot enough
« on: September 18, 2015, 12:46:09 pm »
Hi,

The images you've shown are for a slice file 1 m above the floor, and the maximum temperature is 270 C, not 150 C. At the risk of stating the obvious, it's much hotter up near the ceiling.   :-)

If you load the other slice file of temperature (in the YZ plane) the maximum temperature at 196 s (just before the window opens) is 516 C. See below. Note that I manually set the maximum temperature range to 600 C to ensure that the problem wasn't the auto scaling of the temperature range.

Dave

14
PyroSim / Re: steady fire
« on: September 04, 2015, 07:21:46 am »
Hi Tricia,

The original cell size would work fine. I changed it because the original single mesh had over 3 million cells, and I knew i would have to sub-divide it to get quick results. I find it easier to work with cells that have even, and equal, divisions, so I created cells that were 0.20 m a side.

That is an odd looking image, and does not resemble what I was seeing on your simulation. It looks like an underventilated fire. The simple mixing combustion model works by assuming that where ever fuel and oxygen mix in the stoichiometric ratio, combustion will occur. I think that is what you are looking at. The fire spread parameter refers to radially spreading fires over a burner surface, and is not what you are looking at.

The revised file I sent you has an instantly starting fire of ~ 6 MW, that appears to be coming from a mattress. That is not representative of a typical mattress fire.

Dave

15
PyroSim / Re: steady fire
« on: September 03, 2015, 05:47:35 am »
Hi Peter,

I can't save to an earlier version of PyroSim, but I've attached the .fds file, which you can import into PyroSim.

Dave

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