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counting total positive radiative flux

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Old   March 7, 2018, 14:30
Default counting total positive radiative flux
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Hello,

I have a pipe enclosed in insulation bricks. There is air inside the pipe. There is no mass flow and radiation is turned on for air domain. one side of the pipe is hotter then the other side therefore I get positive radiation flux on cca 1/3 of the pipe and negative flux on the remaining 2/3. I am interested only in positive radiation flux and dont know how to count it with an expression or function calc. I want to do areInt of radiative flux but only for positive values.

The surrounding is around 700C so radiation is important for me.

Is it even possible? thank you very much
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Old   March 8, 2018, 02:59
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Why don't you create a new variable in Post? Something like max(0 [W/m^2],Wall Radiative Heat Flux) and integrate this new variable?
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Old   March 8, 2018, 03:47
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Quote:
Originally Posted by Gert-Jan View Post
Why don't you create a new variable in Post? Something like max(0 [W/m^2],Wall Radiative Heat Flux) and integrate this new variable?
Thank you sir very much. It worked. I thought that max function was only to calculate the maximum value of given variable. Didn't know it could be used this way.
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Old   March 8, 2018, 03:50
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The maximum of a variable at a certain location can be found using maxVal(....)@location
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