Learning Forum

[Kilian Nuss]

Hey everyone,

what are the settings to create a contact pair / connection between two geometries in Fluent Meshing / Space Claim like shown in the picture?

Or otherwise how can I be able to "Manual Create" mesh interfaces between two cell zones in respect of the geometry (with voids) seen in the picture?

My aim is that the cell zone of the big pipe is rotationg along the x-axis by a moving reference frame. The wall of the big pipe will be stationary to the absolut reference and the inside of the pipe is moving relative to adjacent cell zone. The small pipe is stationary.

Thanks you in advance.

[Rob]

If it's a reference frame you want two volumes that are connected: so the common face will be curved to fit the "red" cylinder. In DM you want a multibody part and from SpaceClaim "share topology". You'll finish up with an interior surface. If you want sliding mesh then the above contact is correct assuming the "blue" end has the same shape as the red face. 

[Kilian Nuss]

Hey Rob,

thanks for the quick response.

The blue end and the red pipe do have the same shape.

However, I still got some follow-up questions. 
Can I create the "share topology" in Space Claim as well as in Fluent Meshing?
I am right in the assumption, that you do not need a Mesh Interface if you apply "share topology"?
If I would do a transient analysis, I would need a sliding mesh. In this case, how would I be able to create the above contact?

[Rob]

Do ShareTopo in SC as it's more reliable. It's also one less step in Fluent Meshing for whenever you do a mesh update. 

Correct, assuming the faces connect then you'll have an interior face as opposed to two interface surfaces. 

We can run mrf in steady or transient: sliding is transient only. The reason for using one of the other is whether the rotation changes something physical in the flow. Ie if it's a mixing tank impellor and there's a close pass between the blade and baffles you need sliding mesh. Otherwise the averaging from mrf is fine, and it's computationally cheaper. 

[Kilian Nuss]

Thank you very much, it helped me a lot.