Unexpected pressure zone with multi meshes

[cunco...@gmail.com]

Hi everyone,

 I'm running a simulation with one pressure zone for multi meshes. There isn't any air movement inside my domain.

 When i plot the zone pressure in the hrr csv file, the pressure zone is about -155 Pa. This value looks confusing to me because i was expecting a near zero pressure. I've tried with difference leak area but i have the same zone's pressure.

 Could you please help me to find the root of my problem. The pyrosim ans the fds files are attached.

 Thanks in advance!

[cunco...@gmail.com]

[cunco...@gmail.com]

[Kevin McGrattan]

The _hrr.csv file reports the average pressure for the entire zone; whereas the devc.csv file reports the pressure above or below the ambient pressure at that particular elevation. 

[cunco...@gmail.com]

Thanks Kevin but if this is the average pressure, how can it be -155 while there isn't any air circulation in the domain. These line in the user guide look confusing : ''If you specify pressure ZONEs; that is, specific areas of the domain where the background pressure rises

above ambient, the pressure of each zone is listed in the file CHID_hrr.csv.'' 

[Kevin McGrattan]

There is still a pressure drop within the enclosure, even if there is no air movement. It appears that -155 Pa corresponds to about 13 m above z=0. 

Delta p = -rho g z = -1.2*9.8*13 = -153 Pa

[cunco...@gmail.com]

oh, my bad, i forgot about this detail. Thank you Kevin.