NRCC Smoke Tower Validation Floor 1 Door Opening (East) Gap

[bjork3]

Hello FDS community,

I've been working with the FDS Validation models for the NRCC Smoke Tower (in PyroSim), and I found something minor which I am curious about.

The context of this model is the 2006-2007 NRCC Experiments and Yan Wang's 2008 (Carleton) Master's Thesis which includes descriptions of the FDS and real world geometries during the tests which became FDS Validation. In Wang's thesis, page 26 there is a discussion of open/closed conditions of First Floor doors. I believe the "2nd" GROUP experiments in Table 3-2 is relevant to the FDS Validation models.

DR-2 (Wang) or [40] (in Tyson's 2015 Thesis) is represented in each FDS Input File: BK-R, CLC-I_R, CLC-II-R, and CMP-R.

For example, for test CMP-R (Path to the file: Validation/NRCC_Smoke_Tower/FDS_Input_Files/CMP-R.fds)

...
Line 221: &OBST XB=15.575,15.7, 4.35, 6.15, 0.0, 2.1, SURF_ID='Timber Door'/ 1st Floor Door
...
Line 441: &HOLE XB=15.700,15.9, 4.40, 6.20, 0.0, 2.1 /
...

As specified in these lines, for the Y dimensions, the Door Obstruction is slightly offset from the Hole dimensions. Because the Mesh Cell Size for this model is uniformly 0.1m, was the intent to create a gap, or not?

Thank you!
Anders

[mcgratta]

If I remember correctly, Paul Tyson contributed the original input files for these cases in 2015. You can see the history of that particular case. My guess is that somewhere along the line I changed the geometry to conform to the 10 cm mesh, but missed a few. I would think that what you have shown is a mistake and not intentional. But it might also be that the door is supposed to be partially open. I'll have to look more closely.

[mcgratta]

I took another look at the input files. The grid cells are exactly 0.1 m by 0.1 m by 0.1 m, which means that obstruction dimensions will round to the nearest 0.1 m. I probably overlooked some of the obstructions in the process. In any event, the mismatch is not intentional or meant to leave a gap.

[bjork3]

Thank you very much for looking into it! I appreciate the confirmation.