[help] an Error appears when setting periodic boundaries!

loveHL · April 16, 2014, 09:18

Hello! I'm new in Star ccm+. Now I encounter a difficult.

I want to set periodic boundaries in my mesh model. however, after I clicked two faces, then right-clicked ’create interface ‘, and selected Periodic, there was a warning appearing on the Output window----Warning: "Periodic 5" interface type star.common.InternalInterface is incompatible with selected models. Reason: Model SolidStressModel is incompatible with model(s) on the other side.

My mesh model is imported from Gambit and is followed:

QQ??20140416200715.png

I hope some one can help me!

me3840 · April 16, 2014, 11:46

It appears you can't use periodic BCs with the FVS model. What do you need to do with this simulation?

loveHL · April 16, 2014, 23:03

Quote:

Originally Posted by me3840

It appears you can't use periodic BCs with the FVS model. What do you need to do with this simulation?

I want to simulate the deep groove seal. In the former attachment, there are two black model, one of which is a static ring and another a rotary ring, and between of them is a thin film, about 4 microns.

me3840 · April 18, 2014, 16:52

Keep in mind that the FVS model is only applicable in the linear elastic region.

Can't you just do the whole ring? This doesn't look very big, the extra expense may not be too large.

loveHL · April 20, 2014, 23:17

Hi, Thank you! I solved this problem, there was a setting I had not set.

But, now I have a new problem, When I'm running, "Attempt to access unallocated VolumeFractionLevel1 storage in cells in deep_fluid" appears in the output.

Do you know why?

me3840 · April 21, 2014, 13:59

That error is generally some kind of initialization problem. Be sure you have all solvers unfrozen. Clear the solution and reinitialize it.

loveHL · April 21, 2014, 23:14

Thanks for your reply! Is your meaning hitting Solvers and unselecting Solver Frozen? I did it, cleared solution, initialized solution ,and then ran again. However, a error appeared----A floating point exception has occurred: floating point exception [Divide by zero]. The specific cause cannot be identified. Please refer to the troubleshooting section of the User' Guide.
Is my mesh bad?

me3840 · April 22, 2014, 11:22

If your simulation blows up immediately there may be a problem with your mesh, but more likely there's a problem with your physics or boundary conditions.

April 16, 2014, 09:18	[help] an Error appears when setting periodic boundaries!	#1
loveHL New Member Join Date: Apr 2014 Posts: 6 Rep Power: 12	Hello! I'm new in Star ccm+. Now I encounter a difficult. I want to set periodic boundaries in my mesh model. however, after I clicked two faces, then right-clicked ’create interface ‘, and selected Periodic, there was a warning appearing on the Output window----Warning: "Periodic 5" interface type star.common.InternalInterface is incompatible with selected models. Reason: Model SolidStressModel is incompatible with model(s) on the other side. My mesh model is imported from Gambit and is followed: QQ??20140416200715.png I hope some one can help me!

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April 16, 2014, 11:46		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 25	It appears you can't use periodic BCs with the FVS model. What do you need to do with this simulation?

April 18, 2014, 16:52		#4
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 25	Keep in mind that the FVS model is only applicable in the linear elastic region. Can't you just do the whole ring? This doesn't look very big, the extra expense may not be too large.

April 20, 2014, 23:17		#5
loveHL New Member Join Date: Apr 2014 Posts: 6 Rep Power: 12	Hi, Thank you! I solved this problem, there was a setting I had not set. But, now I have a new problem, When I'm running, "Attempt to access unallocated VolumeFractionLevel1 storage in cells in deep_fluid" appears in the output. Do you know why?

April 21, 2014, 13:59		#6
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 25	That error is generally some kind of initialization problem. Be sure you have all solvers unfrozen. Clear the solution and reinitialize it.

April 21, 2014, 23:14		#7
loveHL New Member Join Date: Apr 2014 Posts: 6 Rep Power: 12	Thanks for your reply! Is your meaning hitting Solvers and unselecting Solver Frozen? I did it, cleared solution, initialized solution ,and then ran again. However, a error appeared----A floating point exception has occurred: floating point exception [Divide by zero]. The specific cause cannot be identified. Please refer to the troubleshooting section of the User' Guide. Is my mesh bad?

April 22, 2014, 11:22		#8
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 25	If your simulation blows up immediately there may be a problem with your mesh, but more likely there's a problem with your physics or boundary conditions.