Meaning of ().fvmDiv(flux, vf);

And901 · October 17, 2014, 13:18

Hi guys,

i would like to know what is the meaning of the command ().fvmDiv(flux, vf); in file fvmDiv.C.
I ask because i need to modify it. It seems that fvmDiv is implemented in gaussConvectionScheme.C but if i try to write Info << " I'm in gaussConvectionScheme" << it doesn't appear anything when i run the code so i'm not sure what the code does with that command.

Regards,

Andrea

And901 · October 18, 2014, 04:57

Any ideas?

And901 · October 19, 2014, 14:36

could anyone help me please?

chubb87 · October 24, 2014, 14:31

Hi Andrea,

to my knowledge fvmDiv(flux, vf) calculates the divergence of "flux*vf" = flux*interpolate(vf)&mesh.Sf(), (i.e. with vf as a flux on the face, otherwise the multiplication makes no sense and therefore I used quotes). Because of fvm this calculation is done in an implicit way, solving for vf in the equation it is used in.

Did you modify the source code without copying it elsewhere before? Did you compile the code after modifying it? Does the application you ran afterwards use the convection scheme you modified? Those are somewhat trivial but possible reasons for your failed testrun.

Regards.

October 17, 2014, 13:18	Meaning of ().fvmDiv(flux, vf);	#1
And901 New Member Andrea Join Date: Sep 2014 Posts: 17 Rep Power: 11	Hi guys, i would like to know what is the meaning of the command ().fvmDiv(flux, vf); in file fvmDiv.C. I ask because i need to modify it. It seems that fvmDiv is implemented in gaussConvectionScheme.C but if i try to write Info << " I'm in gaussConvectionScheme" << it doesn't appear anything when i run the code so i'm not sure what the code does with that command. Regards, Andrea

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October 18, 2014, 04:57		#2
And901 New Member Andrea Join Date: Sep 2014 Posts: 17 Rep Power: 11	Any ideas?

October 19, 2014, 14:36		#3
And901 New Member Andrea Join Date: Sep 2014 Posts: 17 Rep Power: 11	could anyone help me please?

October 24, 2014, 14:31		#4
chubb87 New Member chubb87 Join Date: May 2011 Posts: 21 Rep Power: 14	Hi Andrea, to my knowledge fvmDiv(flux, vf) calculates the divergence of "fluxvf" = fluxinterpolate(vf)&mesh.Sf(), (i.e. with vf as a flux on the face, otherwise the multiplication makes no sense and therefore I used quotes). Because of fvm this calculation is done in an implicit way, solving for vf in the equation it is used in. Did you modify the source code without copying it elsewhere before? Did you compile the code after modifying it? Does the application you ran afterwards use the convection scheme you modified? Those are somewhat trivial but possible reasons for your failed testrun. Regards.