Radiation in large scale fire

Roman1 · August 13, 2020, 04:12

Hello! I am modelling radiation of large scale fire. The burner is a cylinder of 150 m height.
The parameter to be found is 'G'. Radiation model -fvDOM, firefOAM.The running stops or does not start at all when the domain size exceeds some values. These are 120x70x150 meters, nPhi, nTheta=5, decomposed for running at 8 cores. It just writes 'process killed'. One must decrease number
of angles or cells. I would like to know what kind of restriction works here. For the truth, domain needed size is two times much. Thanks/

cdegroot · August 14, 2020, 12:44

You are most likely running out of memory, since the FVDOM model requires one field for each of the angular directions. You either have to reduce the angular discretization or obtain more memory.

Roman1 · August 15, 2020, 04:08

Thanks. You are absolutely right. I have looked at system monitor. All 8Gb is busy. Without even a small residual.

August 13, 2020, 04:12	Radiation in large scale fire	#1
Roman1 Member Roman Join Date: Sep 2013 Posts: 83 Rep Power: 13	Hello! I am modelling radiation of large scale fire. The burner is a cylinder of 150 m height. The parameter to be found is 'G'. Radiation model -fvDOM, firefOAM.The running stops or does not start at all when the domain size exceeds some values. These are 120x70x150 meters, nPhi, nTheta=5, decomposed for running at 8 cores. It just writes 'process killed'. One must decrease number of angles or cells. I would like to know what kind of restriction works here. For the truth, domain needed size is two times much. Thanks/

August 14, 2020, 12:44		#2
cdegroot Senior Member Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 414 Rep Power: 18	You are most likely running out of memory, since the FVDOM model requires one field for each of the angular directions. You either have to reduce the angular discretization or obtain more memory. __________________ Chris DeGroot, PhD, PEng CEO, Maple Key Labs www.maplekeylabs.com

August 15, 2020, 04:08		#3
Roman1 Member Roman Join Date: Sep 2013 Posts: 83 Rep Power: 13	Thanks. You are absolutely right. I have looked at system monitor. All 8Gb is busy. Without even a small residual. cdegroot likes this.

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