Moving deforming zone

razi.me05 · April 28, 2015, 02:54

For an FSI problem I have a lamina which is deforming and oscillating. I could do it for thin lamina, though the mesh breaks but I could not execute it for a single step for finite thickness lamina.

I have another problem where I wanted to give motion to a oscillating deforming zone. How can I achieve deforming zone that is also oscillating. I tried with DEFINE_GRID_MOTION but if I give this udf motion to a zone it pops up the negative cell volume window.

Thanks in advance.

-mAx- · April 28, 2015, 03:44

what kind of Moving-Deforming Mesh solver did you choose?
On Fluent 6.3 you had 3 possibilities,: smoothing / Remeshing /Layering

razi.me05 · April 28, 2015, 11:55

Dear Max,

I'm using remeshing and smoothing. I've also changed the parameters from the info as well.

-mAx- · April 29, 2015, 01:20

do you get error at first time step?

razi.me05 · April 29, 2015, 14:42

For thin lamina I get the error after sometime, after the cells get stretched or overlapped but form thick lamina I get the error at the first time step.

I think my second problem with deforming zone can be achieved if I can give deforming motion to a thick lamina, which I'm unable to do.

For the 1st problem (with thin lamina) I've used triangle mesh for remeshing to work but I'm not sure why it's still not working.

-mAx- · April 30, 2015, 01:12

you have to work with the parameters

razi.me05 · April 30, 2015, 01:20

I've used the parameters from the scale info.

I also tried with giving DEFINE_GRID_MOTION to the lamina and DEFINE_CG_MOTION to the zone. But the problem I'm facing for this case is that if I give rigid body motion to the zone it doesn't deform. So again the distorted cell problem.

razi.me05 · May 7, 2015, 13:53

It worked after changing the parameters.

I have a question about the capability of Fluent.

Is it possible to give deforming motion to a thick body. I could do it for infinitely thin body but it's not working for thick body.

-mAx- · May 8, 2015, 02:57

I think you can do it with UDF, but don't know how exactly.
You should open a new thread in the UDF subforum

April 28, 2015, 03:44		#2
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	what kind of Moving-Deforming Mesh solver did you choose? On Fluent 6.3 you had 3 possibilities,: smoothing / Remeshing /Layering __________________ In memory of my friend Hervé: CFD engineer & freerider

April 29, 2015, 01:20		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	do you get error at first time step? __________________ In memory of my friend Hervé: CFD engineer & freerider

April 30, 2015, 01:12		#6
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	you have to work with the parameters razi.me05 likes this. __________________ In memory of my friend Hervé: CFD engineer & freerider

May 8, 2015, 02:57		#9
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	I think you can do it with UDF, but don't know how exactly. You should open a new thread in the UDF subforum razi.me05 likes this. __________________ In memory of my friend Hervé: CFD engineer & freerider

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April 28, 2015, 11:55		#3
razi.me05 Member Nevada Join Date: Apr 2014 Posts: 32 Rep Power: 12	Dear Max, I'm using remeshing and smoothing. I've also changed the parameters from the info as well.

April 29, 2015, 14:42		#5
razi.me05 Member Nevada Join Date: Apr 2014 Posts: 32 Rep Power: 12	For thin lamina I get the error after sometime, after the cells get stretched or overlapped but form thick lamina I get the error at the first time step. I think my second problem with deforming zone can be achieved if I can give deforming motion to a thick lamina, which I'm unable to do. For the 1st problem (with thin lamina) I've used triangle mesh for remeshing to work but I'm not sure why it's still not working.

April 30, 2015, 01:20		#7
razi.me05 Member Nevada Join Date: Apr 2014 Posts: 32 Rep Power: 12	I've used the parameters from the scale info. I also tried with giving DEFINE_GRID_MOTION to the lamina and DEFINE_CG_MOTION to the zone. But the problem I'm facing for this case is that if I give rigid body motion to the zone it doesn't deform. So again the distorted cell problem.

May 7, 2015, 13:53		#8
razi.me05 Member Nevada Join Date: Apr 2014 Posts: 32 Rep Power: 12	It worked after changing the parameters. I have a question about the capability of Fluent. Is it possible to give deforming motion to a thick body. I could do it for infinitely thin body but it's not working for thick body.