[ANSYS Meshing] Internal solid wall from ICEM not showing on Fluent

matosmmd · January 23, 2024, 20:02

Dear all,

I have a mesh in ANSYS ICEM (v19.2) of a cilinder (D = 0.02 m, L = 0.5 m ) with and internal circle (d = 0.018) at Z = 0.03 m. The fluid should go from the inlet to the outlet, passing by the internal wall which leaves a little space for it to pass between the external cilinder and the circle. I have all the sections named. The circle is a wall, and is also set as a boundary condition ("output mesh > boundary condition). However, when I read the mesh in Fluent, the internal wall of the circle is ignored and joined with the interior of the cilinder. How can I fix this?

If someone can help, I could show the files by email.

Best regards,

Thanks a lot!

M. Matos

Gert-Jan · January 24, 2024, 03:02

I don't know Fluent. I try to avoid it as much as possible.

What can help is to split the geometry in two volumes at the location where your circle (butterfly valve??) is located. Then you get an interface between both volumes which contains your circle and the space around it. This helps Fluent to recognize the valve. In Fluent you might have to define an interface on the surface around the circle (you don't want it to be a wall).

As a test, what if you export it to CFX and import it is CFX-Pre, then what do you see?
If you see the circle in CFX, then you have set it up correctly. Then you can define a wall, save this file and import this CFX-file in Fluent and see what you get.

matosmmd · January 27, 2024, 08:35

Thank you so much for the reply.

I tried to open with CFX, but the same happens, no circle.

It is not a valve, it is just a circle inside a cilinder, I attached pictures to be easier.

I tried to separate the volumes, but nothing different happens. Do you know if its possible to transform the geometry edge of the circle into a solid body? ICEM is not showing the option.

Thaks again for the help!

Gert-Jan · January 28, 2024, 15:12

It looks like you treat the circle as a thin surface (Internal Wall). So, you need to set it like that, otherwise ICEM will ignore it.
You need to go to Mesh > Part Mesh Setup. There in the last column, you have to tick Split Wall for your circle.
Internal Wall might work as well, but I expect Fluent to prefer Split walls.

January 23, 2024, 20:02	Internal solid wall from ICEM not showing on Fluent	#1
matosmmd New Member Matos Join Date: Jan 2024 Posts: 3 Rep Power: 2	Dear all, I have a mesh in ANSYS ICEM (v19.2) of a cilinder (D = 0.02 m, L = 0.5 m ) with and internal circle (d = 0.018) at Z = 0.03 m. The fluid should go from the inlet to the outlet, passing by the internal wall which leaves a little space for it to pass between the external cilinder and the circle. I have all the sections named. The circle is a wall, and is also set as a boundary condition ("output mesh > boundary condition). However, when I read the mesh in Fluent, the internal wall of the circle is ignored and joined with the interior of the cilinder. How can I fix this? If someone can help, I could show the files by email. Best regards, Thanks a lot! M. Matos

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January 24, 2024, 03:02		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	I don't know Fluent. I try to avoid it as much as possible. What can help is to split the geometry in two volumes at the location where your circle (butterfly valve??) is located. Then you get an interface between both volumes which contains your circle and the space around it. This helps Fluent to recognize the valve. In Fluent you might have to define an interface on the surface around the circle (you don't want it to be a wall). As a test, what if you export it to CFX and import it is CFX-Pre, then what do you see? If you see the circle in CFX, then you have set it up correctly. Then you can define a wall, save this file and import this CFX-file in Fluent and see what you get.

January 28, 2024, 15:12		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	It looks like you treat the circle as a thin surface (Internal Wall). So, you need to set it like that, otherwise ICEM will ignore it. You need to go to Mesh > Part Mesh Setup. There in the last column, you have to tick Split Wall for your circle. Internal Wall might work as well, but I expect Fluent to prefer Split walls.