Special BC

Tobi · May 9, 2013, 08:31

Hi all,

i am trying to simulate a baffle that is closed the first 60 sec. then it opens for the fluid for 60 sec and so on.

There for I wanted to use a sin - function like that:

sin (xxxx) > 0 -> baffle open
sin (xxxx) < 0 -> baffle closed

In that case it should be possible to use groovyBC is that correct?
Further more is it possible to solve that problem with an steady-state solver?

And finally - what patchtype should it be?

wall
patch
cyclic

In my opinion it could be a patch type

Thanks in advance tobi

mturcios777 · May 9, 2013, 12:14

You can accomplish the same thing with attachDetach mesh modifier. This requires to have a new topoChangerFvMesh; you can probably use the one I submitted for this bug report:

http://www.openfoam.org/mantisbt/view.php?id=572

Make sure you make the change mentioned in the third to last note about creating a new pointfield and then moving the points.

This is working in both 1.6-ext and 2.2.x.

May 9, 2013, 08:31	Special BC	#1
Tobi Senior Member Tobias Holzmann Join Date: Oct 2010 Location: Augsburg (Bavaria / Germany) Posts: 455 Rep Power: 11	Hi all, i am trying to simulate a baffle that is closed the first 60 sec. then it opens for the fluid for 60 sec and so on. There for I wanted to use a sin - function like that: sin (xxxx) > 0 -> baffle open sin (xxxx) < 0 -> baffle closed In that case it should be possible to use groovyBC is that correct? Further more is it possible to solve that problem with an steady-state solver? And finally - what patchtype should it be? wall patch cyclic In my opinion it could be a patch type Thanks in advance tobi

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May 9, 2013, 12:14		#2
mturcios777 Senior Member Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 494 Rep Power: 9	You can accomplish the same thing with attachDetach mesh modifier. This requires to have a new topoChangerFvMesh; you can probably use the one I submitted for this bug report: http://www.openfoam.org/mantisbt/view.php?id=572 Make sure you make the change mentioned in the third to last note about creating a new pointfield and then moving the points. This is working in both 1.6-ext and 2.2.x.