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The last device does not use a SPATIAL_STATISTIC. FDS is treating it as a single point measurement made at the center of the XB. |
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Thanks, dr_jfloyd! |
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Hi, I am trying to understand the use of volume integral and volume mean to calcuate the HRR in the given volume which is 4m x 4m x 4m (volume is 64m3). I made following input file:
-------------User Section (not generated by PyroSim)-------------
&DEVC XB= 0, 4, 0, 4, 0, 4, QUANTITY= "HRRPUV", ID= "HRR_in_full_volume", SPATIAL_STATISTIC = "VOLUME INTEGRAL"/
&DEVC XB= 0, 4, 0, 4, 0, 4, QUANTITY= "HRRPUV", ID= "HRRPUV_in_full_volumne_by_volume_mean", SPATIAL_STATISTIC = "VOLUME MEAN"/
&DEVC XB= 0, 4, 0, 4, 0, 4, QUANTITY= "HRRPUV", ID= "HRRPUV_in_full_volume_direct"/
--------------------PyroSim-generated Section--------------------
&HEAD CHID='e0'/
&TIME T_END=15.0/
&DUMP DT_RESTART=300.0, DT_SL3D=0.25/
&MESH ID='Mesh01', IJK=20,20,20, XB=0.0,4.0,0.0,4.0,0.0,4.0/
&REAC ID='Reaction1',
FUEL='PROPANE'/
&DEVC ID='temp_time_history', QUANTITY='TEMPERATURE', XYZ=2.0,2.0,2.0/
&SURF ID='fire',
COLOR='RED',
HRRPUA=1000.0,
TMP_FRONT=300.0/
&OBST ID='Obstruction', XB=0.0,4.0,0.0,4.0,0.0,0.2, RGB=255,255,255, TRANSPARENCY=0.298039/
&OBST ID='fire', XB=1.4,2.6,1.4,2.6,0.2,0.4, SURF_IDS='fire','INERT','INERT'/
&VENT ID='Mesh Vent: Mesh01 [XMAX]', SURF_ID='OPEN', XB=4.0,4.0,0.0,4.0,0.0,4.0, COLOR='INVISIBLE'/
&VENT ID='Mesh Vent: Mesh01 [XMIN]', SURF_ID='OPEN', XB=0.0,0.0,0.0,4.0,0.0,4.0, COLOR='INVISIBLE'/
&VENT ID='Mesh Vent: Mesh01 [YMAX]', SURF_ID='OPEN', XB=0.0,4.0,4.0,4.0,0.0,4.0, COLOR='INVISIBLE'/
&VENT ID='Mesh Vent: Mesh01 [YMIN]', SURF_ID='OPEN', XB=0.0,4.0,0.0,0.0,0.0,4.0, COLOR='INVISIBLE'/
&VENT ID='Mesh Vent: Mesh01 [ZMAX]', SURF_ID='OPEN', XB=0.0,4.0,0.0,4.0,4.0,4.0, COLOR='INVISIBLE'/
&VENT ID='Mesh Vent: Mesh01 [ZMIN]', SURF_ID='OPEN', XB=0.0,4.0,0.0,4.0,0.0,0.0, COLOR='INVISIBLE'/
&TAIL /
I get the same HRR as HRR_in_full_volume as HRRPUV_in_full_volumne_by_volume_mean*64. But HRRPUV gives very different result. Can someone please what is wrong in approach or understanding?
![0](https://private-user-images.githubusercontent.com/146167548/339316220-0e646f70-de2c-4cc8-b397-efe7ec980542.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MTk1MzgyODksIm5iZiI6MTcxOTUzNzk4OSwicGF0aCI6Ii8xNDYxNjc1NDgvMzM5MzE2MjIwLTBlNjQ2ZjcwLWRlMmMtNGNjOC1iMzk3LWVmZTdlYzk4MDU0Mi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQwNjI4JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MDYyOFQwMTI2MjlaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT04ODgwYmMwOTg0ZjYwYjg4MzYxYTQ0MTllYzQ0YmY5M2FiNjI2YjdhMzVjODg0MGM4OTQ3ZjgyZTFlMDY3MzgyJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCZhY3Rvcl9pZD0wJmtleV9pZD0wJnJlcG9faWQ9MCJ9.BoGr-OWsnlbKIQss-fZE9z3Kb4jIzYXcq4P_FiMG6qM)
![1](https://private-user-images.githubusercontent.com/146167548/339316229-8a4768d2-355f-439f-84ce-2e133ba8b220.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MTk1MzgyODksIm5iZiI6MTcxOTUzNzk4OSwicGF0aCI6Ii8xNDYxNjc1NDgvMzM5MzE2MjI5LThhNDc2OGQyLTM1NWYtNDM5Zi04NGNlLTJlMTMzYmE4YjIyMC5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjQwNjI4JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI0MDYyOFQwMTI2MjlaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT01ODQ4MjllZGM1NDliYzU1MGFmYTUzMDc1ZDFiNWI3MThkMDlhZWMwZjY1ZTIwZDk3NTlkMzFkM2MwMDE0Mjk0JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCZhY3Rvcl9pZD0wJmtleV9pZD0wJnJlcG9faWQ9MCJ9.-tCzlOnVAD1EjyjGXTvt7kWBsaWJSGNf8AOE-U3dADU)
Thanks
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