Learning Forum

[Adidash97]

I wanted to know the difference between the interface and interior zones in FLUENT. What does an interface condition do? 

[tayyaba.bano]

Hi

As far as I understand, an interface is a boundary which separates two different types of meshes and interior is the whole region of fluid.

 

Regards

Tayyaba

[Amine Ben Hadj Ali]

Interface is to connect non-conformal meshes and dissimilar regions (due to frame change, sliding mesh or even physics). Interior is just an internal boundary condition which is 100% permeable for flow. An interface connection can be 100% overlapping and is then similar to interior but can have some portions which are not overlapping (motion, dissimilar mesh topologies and size in each side of the connection,..) which will be then treated as walls.

[Adidash97]

Does the interface act as permeable or as a wall?

[Amine Ben Hadj Ali]

Yes if both sides are overlapping. Example you have an overlapping of 80%: 80% of the interface will be flow passing, 20% will be blocking.

[Adidash97]

If the mesh is not overlapping, is there any way to make them overlapping?

[Amine Ben Hadj Ali]

Please have a look into the following picture. Both regions are connected via an interfaces and this is desired (due to configuration or motion). Now the interface will automatically detected regions of overlapping (interior) and non-overlapping portions (walls). Imagine now you have geometrically a 100% overlapping case but the meshes on each sides of the connection are very very different. The algorithm will here detect portions which are not overlapping. If you are sure that the case is matching please use matching interface or try to reduce the disparity in the mesh.

[Adidash97]

Thank you very much

 

[anh.ngonhat]

I have the similar question about this topic. I have used dynamic method to make my object which covered by a smaller domain moves in fluid. The interfaces dont have any connection or changing respectively. I have choose the internal walls (trg )are rigid body and external walls (src) are deforming. In conclusion, I want to have the connection (remeshing etc.) to fulfill the gap, is there any suggestions for my problem. Thanks a lot

[Rob]

I suspect you need to review the various moving mesh examples in Fluent's Help manual/system.