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Accessing View factors of a patch for postprocessing

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Old   February 14, 2019, 05:00
Default Accessing View factors of a patch for postprocessing
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Sudarshan Padubidre
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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:

M R T 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
  1. How can i access view factors of a patch to create custom function objects?
  2. Is there any other approach I can try to calculate the mean radiant temperature directly?
Thank you
Sudarshan
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Old   December 12, 2019, 20:29
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Jairo A. Gutiérrez S
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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?
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Old   December 15, 2019, 05:12
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Sudarshan Padubidre
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Quote:
Originally Posted by jairoandres View Post
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
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Old   December 19, 2019, 10:28
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Jairo A. Gutiérrez S
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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?
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Old   January 7, 2020, 03:46
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Sudarshan Padubidre
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Quote:
Originally Posted by jairoandres View Post
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.
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Old   June 8, 2020, 10:53
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JuanMi
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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.
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