How to find Mass flow at the inlet and outlet patch

sahmed · June 3, 2016, 13:02

Hi
Could anyone please share your thoughts about how can I find the mass flow at the inlet and outlet patches for a flow through a tube with minimum effor in OpenFOAM? I am using OF version 2.3.1 and I think 'calcMassFlow' utility works with the older versions. Any of your suggestion will be highly appreciated.

bala_gk1988 · June 3, 2016, 14:52

Code:

patchIntegrate phi patchname

sahmed · June 3, 2016, 16:12

Thanks for your reply. Could you please tell me what is the 'phi' here. The Patchname here is the inlet and outlet for my case I believe.
Also, is this an openFoam command to find the mass flow?? PLEASE tell me a little more details.
Thanks once again.

sahmed · June 6, 2016, 11:47

Hi Balajee
Thanks for your sharing. I came to learn that 'patchIntegrae phi patchname -latestTime' is the openfoam command to integrate the quantity 'phi' that is calculated when I select the fluxRequired option in the system/fvSchemes as "p", changing from the default 'no'. The last line of the output from this command gives the integral of phi over the specified patch, which is nothing but the mass flow (in mass/time).
Is that correct? Please correct me if I am wrong.

bala_gk1988 · June 7, 2016, 05:24

Yes. phi is a surfaceScalarField and it represents the mass flux across the faces. And patchIntegrate integrates phi over all the boundary faces in the patch and gives you the mass flux through that patch.

June 3, 2016, 13:02	How to find Mass flow at the inlet and outlet patch	#1
sahmed Member Sheikh Ahmed Join Date: Dec 2015 Location: South Carolina, USA Posts: 88 Rep Power: 10	Hi Could anyone please share your thoughts about how can I find the mass flow at the inlet and outlet patches for a flow through a tube with minimum effor in OpenFOAM? I am using OF version 2.3.1 and I think 'calcMassFlow' utility works with the older versions. Any of your suggestion will be highly appreciated.

June 3, 2016, 14:52		#2
bala_gk1988 New Member Balajee Join Date: Dec 2013 Posts: 13 Rep Power: 12	Code: patchIntegrate phi patchname

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June 3, 2016, 16:12		#3
sahmed Member Sheikh Ahmed Join Date: Dec 2015 Location: South Carolina, USA Posts: 88 Rep Power: 10	Thanks for your reply. Could you please tell me what is the 'phi' here. The Patchname here is the inlet and outlet for my case I believe. Also, is this an openFoam command to find the mass flow?? PLEASE tell me a little more details. Thanks once again.

June 6, 2016, 11:47		#4
sahmed Member Sheikh Ahmed Join Date: Dec 2015 Location: South Carolina, USA Posts: 88 Rep Power: 10	Hi Balajee Thanks for your sharing. I came to learn that 'patchIntegrae phi patchname -latestTime' is the openfoam command to integrate the quantity 'phi' that is calculated when I select the fluxRequired option in the system/fvSchemes as "p", changing from the default 'no'. The last line of the output from this command gives the integral of phi over the specified patch, which is nothing but the mass flow (in mass/time). Is that correct? Please correct me if I am wrong.

June 7, 2016, 05:24		#5
bala_gk1988 New Member Balajee Join Date: Dec 2013 Posts: 13 Rep Power: 12	Yes. phi is a surfaceScalarField and it represents the mass flux across the faces. And patchIntegrate integrates phi over all the boundary faces in the patch and gives you the mass flux through that patch.