calculating view factors

Roman1 · May 23, 2019, 11:51

Hello all. I am running the utility viewFactorsGen with the case that is cubic domain by itself. Solid verges and air inside for future running the solver fireFoam. Now I do not need heatflux but only viewfactors from surface to surface. For example, from the bottom side to the upper side. It is for the purpose of the validation. The are many handbooks with the explicit values of the viewfactors from square to square depending of their sizes. As a result of the utility viewFactorsGen I gain the cube each side of it has viewfactor 1. How can I get viewfactor from side to the side? Thanks.

Roman1 · May 27, 2019, 10:08

It turned out quite easy. One should use zeroGradient instead of greyDiffusiveRadiationViewFactor b.c. on surfaces which are not under consideration. The result is the correct view factor from square to square.
Good luck!

May 23, 2019, 11:51	calculating view factors	#1
Roman1 Member Roman Join Date: Sep 2013 Posts: 83 Rep Power: 13	Hello all. I am running the utility viewFactorsGen with the case that is cubic domain by itself. Solid verges and air inside for future running the solver fireFoam. Now I do not need heatflux but only viewfactors from surface to surface. For example, from the bottom side to the upper side. It is for the purpose of the validation. The are many handbooks with the explicit values of the viewfactors from square to square depending of their sizes. As a result of the utility viewFactorsGen I gain the cube each side of it has viewfactor 1. How can I get viewfactor from side to the side? Thanks.

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May 27, 2019, 10:08		#2
Roman1 Member Roman Join Date: Sep 2013 Posts: 83 Rep Power: 13	It turned out quite easy. One should use zeroGradient instead of greyDiffusiveRadiationViewFactor b.c. on surfaces which are not under consideration. The result is the correct view factor from square to square. Good luck!