[ICEM] Fluid & Solid_Interface Error_Conjugate Heat Transfer

Nithyanandham · February 14, 2025, 04:07

In a conjugate heat transfer (CHT) problem, I'm encountering an issue with the fluid and solid interface during the meshing process in ICEM CFD. In **Figure 1**, both the fluid and solid interfaces are selected, and the mesh appears complete with no gaps. However, when the fluid interface is unchecked, as shown in **Image 2**, the interface should only involve the solid region, but I notice some gaps. Similarly, when the solid interface is unchecked, as shown in **Image 3**, parts of the fluid mesh are missing.

Because of this issue, I’m unable to calculate the surface Nusselt number. However, I am able to get velocity and temperature contours.

Is the meshing process done correctly, or is there something that needs to be fixed to resolve these gaps? Any advice on how to properly set up the interfaces in this case would be appreciated.

1.jpg

2.jpg

3.jpg

Gert-Jan · February 14, 2025, 10:02

Is this a 2D geometry that you will use in FLuent?

Nithyanandham · February 15, 2025, 01:52

I'm simulating 3D jet impingement. Separate blocking for the solid and fluid domains has been completed, along with association, block splitting, and O-grid generation. No negative elements are present. While I've associated the interface edges with both domains and attempted to smooth the mesh using "Link Edge," some irregularities remain as shown previous query. Anything I missed!. How to resolve this?

IMG-20250215-WA0001.jpg

Gert-Jan · February 17, 2025, 03:40

Not sure.
I would check the normals of the surfaces. All planar surfaces should be in the same direction.

Nithyanandham · February 19, 2025, 07:25

You are saying about this?. How to change the direction?

Screenshot 2025-02-19 164003.jpg

Screenshot 2025-02-19 163927.jpg

Screenshot 2025-02-19 165313.jpg

Gert-Jan · February 19, 2025, 11:30

If you have an Interface or Boundary that contains several geometrical surfaces, then all elements on these surfaces should be oriented consistently.

You can do this in the "Edit Mesh" Ribbon, one the last icons: "ReOrient Mesh"
If you show the mesh of the surfaces, and the elements are coloured differently, then they are oriented differently. Use the menu to orient them consistently. The direction itself doesn't matter.

Then see of this helps.

February 14, 2025, 04:07	Fluid & Solid_Interface Error_Conjugate Heat Transfer	#1
Nithyanandham New Member G. Nithyanandham Join Date: May 2023 Posts: 7 Rep Power: 3	In a conjugate heat transfer (CHT) problem, I'm encountering an issue with the fluid and solid interface during the meshing process in ICEM CFD. In Figure 1, both the fluid and solid interfaces are selected, and the mesh appears complete with no gaps. However, when the fluid interface is unchecked, as shown in Image 2, the interface should only involve the solid region, but I notice some gaps. Similarly, when the solid interface is unchecked, as shown in Image 3, parts of the fluid mesh are missing. Because of this issue, I’m unable to calculate the surface Nusselt number. However, I am able to get velocity and temperature contours. Is the meshing process done correctly, or is there something that needs to be fixed to resolve these gaps? Any advice on how to properly set up the interfaces in this case would be appreciated. 1.jpg 2.jpg 3.jpg

February 15, 2025, 01:52	Interface Error - 3D Jet Impingement - ICEM CFD	#3
Nithyanandham New Member G. Nithyanandham Join Date: May 2023 Posts: 7 Rep Power: 3	I'm simulating 3D jet impingement. Separate blocking for the solid and fluid domains has been completed, along with association, block splitting, and O-grid generation. No negative elements are present. While I've associated the interface edges with both domains and attempted to smooth the mesh using "Link Edge," some irregularities remain as shown previous query. Anything I missed!. How to resolve this? IMG-20250215-WA0001.jpg

February 19, 2025, 07:25	Interface Error	#5
Nithyanandham New Member G. Nithyanandham Join Date: May 2023 Posts: 7 Rep Power: 3	You are saying about this?. How to change the direction? Screenshot 2025-02-19 164003.jpg Screenshot 2025-02-19 163927.jpg Screenshot 2025-02-19 165313.jpg

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February 14, 2025, 10:02		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,948 Rep Power: 28	Is this a 2D geometry that you will use in FLuent?

February 17, 2025, 03:40		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,948 Rep Power: 28	Not sure. I would check the normals of the surfaces. All planar surfaces should be in the same direction.

February 19, 2025, 11:30		#6
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,948 Rep Power: 28	If you have an Interface or Boundary that contains several geometrical surfaces, then all elements on these surfaces should be oriented consistently. You can do this in the "Edit Mesh" Ribbon, one the last icons: "ReOrient Mesh" If you show the mesh of the surfaces, and the elements are coloured differently, then they are oriented differently. Use the menu to orient them consistently. The direction itself doesn't matter. Then see of this helps.