bc:Inletmassflow as function of pressure drop

Meister · May 28, 2014, 05:36

Hi everyone,

im quite new to of but i already setup some geometries and simulated successfully with icoFoam and simpleFoam.
I want to compare a existing cfx-simulation with of. It is stationary, incompressible and isotherm and the geometry is more or less a tube. For the Inlet boundary-condition in cfx I used a user-function which measures a pressure-drop (between two interfaces) and puts a related massflow to the Inlet. So my question is how can i establish such a "user-function" in of, does anyone has a Idea?

Thanks!

jherb · June 27, 2014, 13:47

Have a look at groovyBC http://openfoamwiki.net/index.php/Contrib_groovyBC

I think it should be possible with it (you can determine the pressures at different positions and calculate values based on them to be used as boundary conditions). Also search this forum.

See also http://openfoamwiki.net/images/7/7a/...icTraining.pdf and search for Boundary conditions with feedback

Meister · June 30, 2014, 09:23

Hi Jherb,

thanks for the helpful links, I will try groovyBC for that.

Thank you!

May 28, 2014, 05:36	bc:Inletmassflow as function of pressure drop	#1
Meister New Member Thomas Join Date: May 2014 Posts: 14 Rep Power: 12	Hi everyone, im quite new to of but i already setup some geometries and simulated successfully with icoFoam and simpleFoam. I want to compare a existing cfx-simulation with of. It is stationary, incompressible and isotherm and the geometry is more or less a tube. For the Inlet boundary-condition in cfx I used a user-function which measures a pressure-drop (between two interfaces) and puts a related massflow to the Inlet. So my question is how can i establish such a "user-function" in of, does anyone has a Idea? Thanks!

June 30, 2014, 09:23	Thanks!	#3
Meister New Member Thomas Join Date: May 2014 Posts: 14 Rep Power: 12	Hi Jherb, thanks for the helpful links, I will try groovyBC for that. Thank you!

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June 27, 2014, 13:47		#2
jherb Senior Member Joachim Herb Join Date: Sep 2010 Posts: 650 Rep Power: 22	Have a look at groovyBC http://openfoamwiki.net/index.php/Contrib_groovyBC I think it should be possible with it (you can determine the pressures at different positions and calculate values based on them to be used as boundary conditions). Also search this forum. See also http://openfoamwiki.net/images/7/7a/...icTraining.pdf and search for Boundary conditions with feedback