Accessing View factors of a patch for postprocessing

pss47 · February 14, 2019, 06:00

Hello,
I am performing steady-state passenger cabin simulation using OpenFOAM 6 including radiation load using view factor model.

I want to calculate Mean Radiant temperature for the mannequin after running the simulation.

$M R T = T _ { 1 } F _ { p - 1 } + T _ { 2 } F _ { p - 2 } + \ldots + T _ { n } F _ { p - n }$

where:

is Mean Radiant Temperature
$T _ { n }$ is the temperature of surface "n", in Kelvin
$F _ { p - n }$ is the angle factor between a person and surface "n".

My questions are

How can i access view factors of a patch to create custom function objects?
Is there any other approach I can try to calculate the mean radiant temperature directly?

Thank you
Sudarshan

jairoandres · December 12, 2019, 21:29

Hi, could you finally solve that problem? I was reading a PhD thesis and they did it externally through the analytical procedure. Were you able of doing it directly in OpenFOAM?

pss47 · December 15, 2019, 06:12

Quote:

Originally Posted by jairoandres

Hi, could you finally solve that problem? I was reading a PhD thesis and they did it externally through the analytical procedure. Were you able of doing it directly in OpenFOAM?

Hey,
I couldn't do it directly in the OpenFOAM. It would be great if you post me a link of the paper for my future reference.

Thanks

jairoandres · December 19, 2019, 11:28

Sure, it's
Indoor Thermal Comfort Modeling and Simulation Using Computational Fluid Dynamics. Authors: Krzysztof Arendt & Marek Krzaczek

I am going to use the correlations given by "Angle Factor Calculation for the Thermal Radiation Environment of the Human Body". How did you resolve the problem?

pss47 · January 7, 2020, 04:46

Quote:

Originally Posted by jairoandres

Sure, it's
Indoor Thermal Comfort Modeling and Simulation Using Computational Fluid Dynamics. Authors: Krzysztof Arendt & Marek Krzaczek

I am going to use the correlations given by "Angle Factor Calculation for the Thermal Radiation Environment of the Human Body". How did you resolve the problem?

Since I had limited time to finish my master thesis, I gave up on calculating MRT.

keitaro7_14 · June 8, 2020, 11:53

You can access to the viewfactor by means of the the dictionary viewFactorsDict.

You must write : debug 1; inside the dictionary to show the view factors when viewFactorsGen is executed.

February 14, 2019, 06:00	Accessing View factors of a patch for postprocessing	#1
pss47 New Member Sudarshan Padubidre Join Date: May 2018 Posts: 14 Rep Power: 8	Hello, I am performing steady-state passenger cabin simulation using OpenFOAM 6 including radiation load using view factor model. I want to calculate Mean Radiant temperature for the mannequin after running the simulation. $M R T = T _ { 1 } F _ { p - 1 } + T _ { 2 } F _ { p - 2 } + \ldots + T _ { n } F _ { p - n }$ where: is Mean Radiant Temperature $T _ { n }$ is the temperature of surface "n", in Kelvin $F _ { p - n }$ is the angle factor between a person and surface "n". My questions are How can i access view factors of a patch to create custom function objects? Is there any other approach I can try to calculate the mean radiant temperature directly? Thank you Sudarshan

June 8, 2020, 11:53		#6
keitaro7_14 Member JuanMi Join Date: Nov 2017 Posts: 41 Rep Power: 9	You can access to the viewfactor by means of the the dictionary viewFactorsDict. You must write : debug 1; inside the dictionary to show the view factors when viewFactorsGen is executed. Jay22kar likes this.

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December 12, 2019, 21:29		#2
jairoandres Member Jairo A. Gutiérrez S Join Date: Nov 2014 Posts: 60 Rep Power: 12	Hi, could you finally solve that problem? I was reading a PhD thesis and they did it externally through the analytical procedure. Were you able of doing it directly in OpenFOAM?

December 19, 2019, 11:28		#4
jairoandres Member Jairo A. Gutiérrez S Join Date: Nov 2014 Posts: 60 Rep Power: 12	Sure, it's Indoor Thermal Comfort Modeling and Simulation Using Computational Fluid Dynamics. Authors: Krzysztof Arendt & Marek Krzaczek I am going to use the correlations given by "Angle Factor Calculation for the Thermal Radiation Environment of the Human Body". How did you resolve the problem?