[AvaShahrokhi]

Hi everybody

I have a question about the mesh interface. I have a domain in ICEM that has an unstructed tetra and hexa mesh next to each other. I have generated two faces at the same location in the interface on with structured mesh and other with unstructured tetra mesh and defined both as 'interface' in the boundary condition.

Once I read the mesh file in Fluent, I go to the interface option to pair the two faces and I can do this. However, Fluent defines a 'wall' for this interface and add it to boundary condition as 'wall' with zero face (I can not display this wall!).

Is this correct or I am making a mistake in defining the interface?

Thank you very much in advance!

[ghost82]

I think this is correct.

Daniele

[AvaShahrokhi]

Many thanks Daniele for your reply!

So do you think that this imaginary wall acts as a real wall in the boundary condition? e.g., if I have a vortex in the unstructured part, close to this wall, it will be limited to this wall rather than continuing in the structured domain?

Ava.

[ghost82]

In reality I don't know why fluent create wall when an interface is defined.
Your interface will not act as a wall, fluid is allowed to go from one zone to the adjacent through the interface.

Here (point (d)):
http://aerojet.engr.ucdavis.edu/flue...ug/node176.htm

you can read that this is ok.

Daniele

[AvaShahrokhi]

Thank you very much!

Ava.

[kad]

"Wall" is the boundary condition for those faces on the interface that do not overlap with an adjacent face. E.g. this can be the case when you have sliding mesh interface with translational movement.

[AvaShahrokhi]

Kad,

Thank you very much for your comment. I do not have a translational surface. I have just an unstructured mesh and a structured mesh that wish to connect them through mesh interface. This is inside my domain so I really do nit wish to have a wall there!

Ava.

[Cucko]

Originally Posted by AvaShahrokhi

Hi everybody

I have a question about the mesh interface. I have a domain in ICEM that has an unstructed tetra and hexa mesh next to each other. I have generated two faces at the same location in the interface on with structured mesh and other with unstructured tetra mesh and defined both as 'interface' in the boundary condition.

Once I read the mesh file in Fluent, I go to the interface option to pair the two faces and I can do this. However, Fluent defines a 'wall' for this interface and add it to boundary condition as 'wall' with zero face (I can not display this wall!).

Is this correct or I am making a mistake in defining the interface?

Thank you very much in advance!

Hey,

try to change the "interface" at the boundary conditions to a Wall part and then from a wall to a interior part. Maybe this will help you.

Greetings cucko

[ghost82]

Oh yes, now I remember!
If you have 2 surfaces, one bigger than the other, you can set the interface and for the non overlapping surface the default wall boundary condition will be applied (the new surface wall-xx).
Obviously you can change this wall boundary condition.
But this is a case different than yours.
So, your setup for interface is ok if you have 2 identical overlapping surfaces.

See attached example (interface created with surface 1 and surface 2)

Daniele

[marauder]

Seems like there is one more zone or plane in between these two zones which fluent is considering as solid. Most probably this happens when there are contact regions in Ansys mesh between two solids, in which case you haven't defined your bodies properly i.e., either solid or liquid. Which cad and meshing interface have you used??

[Lipz]

Originally Posted by kad

"Wall" is the boundary condition for those faces on the interface that do not overlap with an adjacent face. E.g. this can be the case when you have sliding mesh interface with translational movement.

Hello Kad, I have a problem related to what you said here. Torpedo is ejecting from a launch tube. I attached a picture of my boundary conditions. Pressure inlet is unsteady that i done through udf. I used dynamic layering option in Fluent for mesh movement. Fluid near to torpedo and Torpedo edge i set as rigid motion and remaining stationary. I created the interface as you see in the picture.(just selected the common edges of both faces and manually create the mesh interface without selecting any mesh interface option like periodic, coupled etc). How i created the mesh interface is, I just make line in the modeller and slice the body to two bodies. 1) fluid body near to torpedo 2)outer fluid.

My problem is, After the mesh motion I mean after some iterations, the torpedo is moving but in the interface the wall like effect is coming. It seems like after the torpedo came out, there is wall like effect on the outer part of torpedo. Its like torpedo is ejecting with tube on it. Why there is no smooth tranfer is showing in the interface boundary. Its like fluid is hit on a wall created in the interface.

Sorry for my poor english. I hope i conveyed my problem. Thanks for user assistance in this regard. Any other peoples help also much appriciated.

Thank you all