Stl Model and Model after preprocessor are not the same !!!

AttaponC · September 22, 2009, 11:34

http://img97.imageshack.us/i/model.jpg/
http://img2.imageshack.us/i/preprocessor.jpg/

Hi everyone
I 'm try to learning flow-3D.
I modeled like a flow from weir.
And I found problem.
After I did preprocessor the solid model has been changed.
Somes wall of them disappeared. And I tried to run simulation.
And the result showed that there was no that wall.
Please see picture for more detail.
Could anyone guide me what I have done wrong......

Thank in Advance

ck5285 · September 24, 2009, 13:05

Hi Attapon
I believe the wall presented here is a thin wall right? so, I suspect your mesh is not fine enough to resolve the solid wall eg: solid object needs a least 2 cells a long the thickness for good meshing. So, you may need to use fix point to ensure you have at least 2 cells along the thickness of thin wall object. Hope this help.

MuxaB · September 30, 2009, 23:54

Attapon, did you figure it out? Was it poor mesh resolution?

September 22, 2009, 11:34	Stl Model and Model after preprocessor are not the same !!!	#1
AttaponC New Member Attapon Join Date: Sep 2009 Posts: 2 Rep Power: 0	http://img97.imageshack.us/i/model.jpg/ http://img2.imageshack.us/i/preprocessor.jpg/ Hi everyone I 'm try to learning flow-3D. I modeled like a flow from weir. And I found problem. After I did preprocessor the solid model has been changed. Somes wall of them disappeared. And I tried to run simulation. And the result showed that there was no that wall. Please see picture for more detail. Could anyone guide me what I have done wrong...... Thank in Advance

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September 24, 2009, 13:05		#2
ck5285 Senior Member Join Date: Mar 2009 Posts: 129 Rep Power: 17	Hi Attapon I believe the wall presented here is a thin wall right? so, I suspect your mesh is not fine enough to resolve the solid wall eg: solid object needs a least 2 cells a long the thickness for good meshing. So, you may need to use fix point to ensure you have at least 2 cells along the thickness of thin wall object. Hope this help.

September 30, 2009, 23:54		#3
MuxaB Senior Member michael barkhudarov Join Date: Mar 2009 Location: Sante Fe, New Mexico, USA Posts: 336 Rep Power: 18	Attapon, did you figure it out? Was it poor mesh resolution?