CFD Online Discussion Forums - How can I use wallHeatFlux with modified icoFoam that has energy equation

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How can I use wallHeatFlux with modified icoFoam that has energy equation

I added energy equation to icoFoam. now I want to use wallheatFlux utility for icoFoam.how can I do this?
im very appreciate for any help

You should add to your transportProperties file:

Code:



rho0             rho0 [1 -3 0 0 0 0 0] your rho;



Cp0             Cp0 [0 2 -2 -1 0 0 0] your cp;

This should work

im appreciate for your reply

now how I can calculate gradT

Code:

foamCalc grad T

Hope it works with foamCalc if not you will need to install foamCalcEx:

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

Next time try searching in google please.

I downloaded foamCalcex and compile it according to command in http://openfoamwiki.net/index.php/Contrib_foamCalcEx
but when I write

Code:

foamCalc grad T

I get this error:

Code:

sajad@sajad-pc:~/Desktop/heatedCavity2$ foamCalc grad T

Selecting calcType grad





--> FOAM FATAL ERROR: 

Unknown calcType type grad

Valid calcType selections are:



8

(

addSubtract

components

div

interpolate

mag

magGrad

magSqr

randomise

)







    From function calcType::New()

    in file calcType/calcTypeNew.C at line 53.



FOAM aborting



#0  Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam210/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"

#1  Foam::error::abort() in "/opt/openfoam210/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"

#2  Foam::calcType::New(Foam::word const&) in "/opt/openfoam210/platforms/linuxGccDPOpt/lib/libfoamCalcFunctions.so"

#3  

 in "/opt/openfoam210/platforms/linuxGccDPOpt/bin/foamCalc"

#4  __libc_start_main in "/lib/tls/i686/cmov/libc.so.6"

#5  

 in "/opt/openfoam210/platforms/linuxGccDPOpt/bin/foamCalc"

Aborted

sajad@sajad-pc:~/Desktop/heatedCavity2$ ^C

why it doesnt compile grade?
tnx for your replies

If you downloaded and installed foamCalcEx shouldn´t you use:

Code:

foamCalcEx grad T

tnx for your reply
I calculated gradT and wallHeatflux in wall in my case.now I want to calculate Nusselt Number.I know:
Nu=(q*L)/(gradT*k)
I just should do a fraction.how can I do it for all feild in order to calculate Nusselt number?
I'm appreciate for any help.

You can do that with the paraView calculator.

i'm appreciate for your helps.
you are right but I want calculate Nusselt Number just around the block.but in paraview calculater it calculate all field Nusselt number while the Nusselt is meaning just around the block.I mean I just want the Nusselt Number of cells around the block.

Just use Plot Over Line and extract the data over a patch.

You can also load only the desired patch in paraFoam and calculate the Nusselt number inside the patch