[ANSYS Meshing] Duplicate faces in Spaceclaim

cfd_worker99 · August 15, 2017, 18:22

Hi Guys, hope you are doing great.
I am modeling a helical pipe encased in a solid medium (backfill). The medium is surrounded by soil. The pipe has water inside.
I created a hollow pipe and then imported it to Ansys (SpaceClaim). I then created a cylinder surrounding this pipe and used the merge command to get a cylindrical backfill around this pipe and water (body inside the helical pipe). The backfill is surrounded by cylindrical region of soil.
When I take this model for meshing I run into problems with contact regions.
I looked at my geometry again and when I use Repair>Fix>Duplicates, there are 11 duplicate faces. If use automatic repair, the backfill disappears.
Is there any way to avoid these duplicate surfaces?

Kapi · August 16, 2017, 19:24

don't create pipe separately, use a solid cylinder and use it as a pipe with fluid thru it and then create sand around it.

it will be really helpful if you can post some pics and explain further so I can suggest right solution

cfd_worker99 · August 17, 2017, 16:49

Hi Kapi,
Thank you for you reply.
Here is the image of the geometry:

I looked at through https://support.ansys.com and found that duplicate faces in Spaceclaim are fine if there are touching faces.
The contact problem I was having during meshing was caused by the contact tolerances set too high. I think reducing this fixed the problem.
Still keeping my fingers crossed though for the next steps.
Let me know what you think.

August 15, 2017, 18:22	Duplicate faces in Spaceclaim	#1
cfd_worker99 New Member Lisa Join Date: Apr 2017 Location: USA Posts: 19 Rep Power: 10	Hi Guys, hope you are doing great. I am modeling a helical pipe encased in a solid medium (backfill). The medium is surrounded by soil. The pipe has water inside. I created a hollow pipe and then imported it to Ansys (SpaceClaim). I then created a cylinder surrounding this pipe and used the merge command to get a cylindrical backfill around this pipe and water (body inside the helical pipe). The backfill is surrounded by cylindrical region of soil. When I take this model for meshing I run into problems with contact regions. I looked at my geometry again and when I use Repair>Fix>Duplicates, there are 11 duplicate faces. If use automatic repair, the backfill disappears. Is there any way to avoid these duplicate surfaces?

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August 16, 2017, 19:24		#2
Kapi Senior Member Join Date: Apr 2014 Location: Melbourne Posts: 584 Rep Power: 15	don't create pipe separately, use a solid cylinder and use it as a pipe with fluid thru it and then create sand around it. it will be really helpful if you can post some pics and explain further so I can suggest right solution

August 17, 2017, 16:49		#3
cfd_worker99 New Member Lisa Join Date: Apr 2017 Location: USA Posts: 19 Rep Power: 10	Hi Kapi, Thank you for you reply. Here is the image of the geometry: I looked at through https://support.ansys.com and found that duplicate faces in Spaceclaim are fine if there are touching faces. The contact problem I was having during meshing was caused by the contact tolerances set too high. I think reducing this fixed the problem. Still keeping my fingers crossed though for the next steps. Let me know what you think.