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How can I calculate gradT and Nusselt for this problem

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Old   October 30, 2014, 19:30
Default How can I calculate gradT and Nusselt for this problem
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sajad
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I changed the icoFoam to icoHeatFoam with add energy equation to it.also I change wallheatflux to wallHeatFluxLaminar.now I want to calculate gradT and Nusselt number around the block.how can I do this?

I cant download foamCalcEx because of Region denied.

I attached the my case
rtnx for any help
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Old   October 30, 2014, 20:36
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I calculated magGradT and wallHeatFlux.now just I want to calculate Nusselt Number.I know:
Nuss=wallHeatFlux/magGradT

but I dont know how I compute it in openFoam.I has both wallHeatFlux and magGradT.I just need to do a fraction.how can I do it?
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Old   November 9, 2014, 00:45
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Hi sajad6,

How did you calculate gradT? I'm also trying to calculate it on the wall. Thanks in advance!
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Old   November 9, 2014, 03:02
Default calculating gradT
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Hi dear raghav
you can download foamCalcEx from below link and compile it:

http://openfoamwiki.net/index.php/Contrib_foamCalcEx

after you compile it you can calculate grad T after processing by type the code below:

Code:
foamCalcEx grad T
Best Regards
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Old   November 9, 2014, 20:26
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Thank you very much sajad6

Do you know how I can get the magnitude of the gradient vector directly? I just want it on the walls
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Old   November 10, 2014, 12:50
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Yes.
open your case in terminal and type:
Code:
foamCalc magGrad T
Best Regards
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