March 31, 2026

245 - FDS input file ASMR in forest

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plume_rise_1.fds from the FDS Validation Guide (by NIST) &HEAD CHID='plume_rise_1', TITLE='Test plume rise height in stable atmosphere' / &MESH IJK=50,52,50, XB=-50.,50.,-52.,52.,0.,100., MULT_ID='mesh1' / &MULT ID='mesh1', DZ=100., K_UPPER=1 / &MESH IJK=50,52,50, XB= 50.,250.,-104.,104.,0.,200., MULT_ID='mesh2' / &MULT ID='mesh2', DZ=200., K_UPPER=1 / &MESH IJK=50,50,50, XB=250.,650.,-200.,200.,0.,400., MULT_ID='mesh3' / &MULT ID='mesh3', DX=400., DZ=400., ...

plume_rise_1.fds from the FDS Validation Guide (by NIST)

&HEAD CHID='plume_rise_1', TITLE='Test plume rise height in stable atmosphere' /

&MESH IJK=50,52,50, XB=-50.,50.,-52.,52.,0.,100., MULT_ID='mesh1' /
&MULT ID='mesh1', DZ=100., K_UPPER=1 /
&MESH IJK=50,52,50, XB= 50.,250.,-104.,104.,0.,200., MULT_ID='mesh2' /
&MULT ID='mesh2', DZ=200., K_UPPER=1 /
&MESH IJK=50,50,50, XB=250.,650.,-200.,200.,0.,400., MULT_ID='mesh3' /
&MULT ID='mesh3', DX=400., DZ=400., I_UPPER=3, K_UPPER=1 /

&TIME T_END=900. /

&MISC TMPA=20.36 /

&WIND SPEED=5., LAPSE_RATE=-0.0048 /

&SPEC ID='SULFUR DIOXIDE' /

&VENT MB='XMIN', SURF_ID='OPEN' /
&VENT MB='XMAX', SURF_ID='OPEN' /
&VENT MB='YMIN', SURF_ID='OPEN' /
&VENT MB='YMAX', SURF_ID='OPEN' /
&VENT MB='ZMAX', SURF_ID='OPEN' /

&PART ID='TRACERS', MASSLESS=.TRUE., SAMPLING_FACTOR=1 /

&SURF ID='TOP', TMP_FRONT=200., MASS_FLUX(1)=0.01563, SPEC_ID(1)='SULFUR DIOXIDE', MASS_FLUX(2)=18.85, SPEC_ID(2)='AIR', COLOR='BLACK', PART_ID='TRACERS' /

&OBST XB=-2.0,2.0,-2.0,2.0, 0,75, SURF_IDS='TOP','INERT','INERT' /

&SLCF PBY=0, QUANTITY='VELOCITY', VECTOR=.TRUE. /
&SLCF PBY=0, QUANTITY='TEMPERATURE' /
&SLCF PBY=0, QUANTITY='DENSITY' /
&SLCF PBY=0, QUANTITY='MASS FRACTION', SPEC_ID='SULFUR DIOXIDE' /

&DEVC ID='z_CL', QUANTITY='MASS FRACTION', SPEC_ID='SULFUR DIOXIDE', XB=1800,1850,-200,200,0,800, SPATIAL_STATISTIC='MAXLOC Z' /

&TAIL /

Thank you NIST for providing an endless source of ASMR scripts on your github here: https://github.com/firemodels/fds/tree/master/Validation

I recommend everyone to go through this rich resource.

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The Fire Science Show is produced by the Fire Science Media in collaboration with OFR Consultants. Thank you to the podcast sponsor for their continuous support towards our mission.

00:00 - A New Format For Calm

00:52 - Reading The FDS Mesh Setup

02:59 - Pause To Picture The Plume

03:23 - Boundary Conditions And SO2 Release

05:57 - Diagnostics And Output Definitions

07:23 - Wrap Up And What Comes Next

WEBVTT

00:00:00.989 --> 00:00:01.889
Hello everybody.

00:00:01.889 --> 00:00:03.569
Welcome to the Fire Science Show.

00:00:03.870 --> 00:00:07.860
So we have decided to shift the format a little bit.

00:00:08.189 --> 00:00:25.172
Everyone knows so much about fire science already, And I think while a lot of people enjoy this, what we need now in community is to get some relaxation and get some calm in our stressed lives as fire safety engineer.

00:00:25.832 --> 00:00:36.226
Therefore, introducing new approach to the podcast instead of bringing you interviews from leading fire safety engineers and researchers.

00:00:36.582 --> 00:00:42.371
I will be instead providing a source of relaxation, meditation, and calm.

00:00:42.731 --> 00:00:51.341
From now on in this podcast, we will be providing a SMR readings of FDS case files.

00:00:51.851 --> 00:01:04.421
In this first episode of the new format, we start with validation case wise for atmospheric dispersion FDS input file, plum rise one.

00:01:06.572 --> 00:01:15.182
Okay, let's start with this head, CHID, plum Rice one title test.

00:01:15.182 --> 00:01:18.512
Plum Rice, hide in stable atmosphere.

00:01:19.471 --> 00:01:23.887
Mesh IJK 50 52.

00:01:24.656 --> 00:01:26.206
50 xb.

00:01:27.106 --> 00:01:30.617
Minus 50 50 minus 52.

00:01:30.977 --> 00:01:33.977
52 0 100.

00:01:34.727 --> 00:01:40.246
Mult ID mesh one mult ID mesh one.

00:01:40.427 --> 00:01:51.450
These at equals hundred K upper equals one mesh IJK 50 52 50.

00:01:52.605 --> 00:02:01.635
XP 5,250 minus a hundred and four, a hundred and four zero two hundred.

00:02:02.114 --> 00:02:16.335
Malt ID mesh two malt ID Mesh two dsat equals 200 K upper equals one mesh IJK 50 50.

00:02:16.514 --> 00:02:20.150
50 XB 250.

00:02:20.849 --> 00:02:27.990
650 minus 200, 200 0 400.

00:02:28.680 --> 00:02:30.330
Mult ID mesh.

00:02:30.659 --> 00:02:50.219
Three mult ID Mesh three DX equals 400 D set equals 400 I upper equals three K upper equals one time T end.

00:02:50.729 --> 00:02:59.019
Equals 900 This concludes the mesh part.

00:02:59.408 --> 00:03:01.209
Let's pause here for a second.

00:03:01.479 --> 00:03:09.609
I hope you imagine yourself being in this huge outdoor domain about to observe.

00:03:09.968 --> 00:03:12.848
A plume rising in the atmosphere.

00:03:13.688 --> 00:03:22.239
Let's continue with the reading into the specification of operating conditions and boundary conditions.

00:03:23.348 --> 00:03:23.408
The.

00:03:27.074 --> 00:03:32.954
mis TMPA equals 20.36.

00:03:33.788 --> 00:03:36.639
Wind speed equals five.

00:03:37.389 --> 00:03:43.993
Lapse rate equals minus 0 0 0 48.

00:03:45.343 --> 00:03:46.723
Spec ID.

00:03:47.144 --> 00:03:48.614
Sulfur dioxide.

00:03:49.442 --> 00:04:04.592
VENT MB equals X-Men surf ID Open vent MB Xbox Surf id open vent mb.

00:04:05.176 --> 00:04:31.793
Y min surf ID open vent MB Y max surf id open vent MB Z max Surf ID Open part ID traces MASSLESS equals true sampling factor equals one.

00:04:33.163 --> 00:04:34.303
Serve Id.

00:04:35.024 --> 00:04:48.391
Top TMP front equals 200 mass flux one equals 0.0156.

00:04:48.600 --> 00:04:48.961
Three.

00:04:50.165 --> 00:04:57.630
Pets ID one equals sulfur dioxide, mass flux, two equals.

00:04:58.261 --> 00:05:22.028
18 point 85 SPS ID two equals error color black PERT ID Traces Ops XB minus two two minus 2 2 0 75.

00:05:22.598 --> 00:05:26.348
Serve IDs top in it.

00:05:31.545 --> 00:05:42.641
so we have just created a domain that's predominantly open, as the case file suggests, the plum rise will be in an open atmosphere.

00:05:43.425 --> 00:05:48.843
I hope you feel the space that surrounds you through the open boundary conditions.

00:05:49.233 --> 00:05:57.663
We're about to release some sulfur dioxide, but you'll be able to observe its turbulent mixing with calm.

00:05:57.899 --> 00:06:01.470
Now the last thing to define are our diagnostics.

00:06:01.769 --> 00:06:02.519
Let's do this.

00:06:05.874 --> 00:06:20.483
S-L-C-F-P-B-Y equals zero quantity velocity vector true S-L-C-F-P-B-Y zero.

00:06:20.994 --> 00:06:21.983
Quantity.

00:06:22.524 --> 00:06:28.223
Temperature S-L-C-F-P-B-Y zero.

00:06:28.673 --> 00:06:30.954
Quantity density.

00:06:31.793 --> 00:06:32.869
SLCF.

00:06:33.488 --> 00:06:58.189
PPY zero, quantity, mass fraction pets id, sulfur dioxide, device id, Z underscore cl, quantity, mass fraction PET id, silver dioxide, xb.

00:06:58.894 --> 00:07:06.334
One thousand eight hundred one thousand eight hundred fifty minus 200.

00:07:06.663 --> 00:07:10.504
200 0 800.

00:07:11.374 --> 00:07:16.548
Spatial statistic max lock Z tail.

00:07:21.567 --> 00:07:22.947
This concludes the.

00:07:23.817 --> 00:07:28.526
Test plum rise height in stable atmosphere case file.

00:07:28.826 --> 00:07:37.434
I hope you've enjoyed this and if you are still, he I have no idea what you are doing but I appreciate that, I guess.

00:07:37.463 --> 00:07:39.237
Uh, And yeah.

00:07:39.237 --> 00:07:50.997
And if you have came here to find some fire science and you have found none, I think if you just listen to a very interesting case file of, uh, plum rise of sulfur dioxide in atmosphere.

00:07:51.177 --> 00:07:52.017
Actually, it's good.

00:07:52.017 --> 00:07:54.577
This could be fun to run as I've was reading through it.

00:07:55.012 --> 00:07:55.233
Uh.

00:07:55.978 --> 00:08:02.007
You have not found fire science right now, but I promise you will find some very, very soon.

00:08:02.158 --> 00:08:06.867
Enjoy your day, stay calm, be mindfulness, and uh, yeah.

00:08:06.958 --> 00:08:08.247
Come back to fire science show.

00:08:08.577 --> 00:08:08.937
Cheers.

00:08:08.968 --> 00:08:09.088
Bye.

245 - FDS input file ASMR in forest

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