[VictorWUR]

Hello everyone,

I'm trying to run a simulation of an airflow through a greenhouse for my thesis. I have designed a cube in Inventor with two separate faces (split) acting as windows. Then I imported the geometry to Design Modeller and enclosed it to a flow domain. Then I also created a surface from the face for each of the windows.

When I move to Fluent, the windows are recognised as interfaces and I can't change them to interior, so air can flow through.
Both the domain and the cube have fluid cell zones.

I'm new to fluent, any suggestions?

Kind Regards

[Kushal Puri]

Your mesh is conformal or non conformal ?

[VictorWUR]

At this point, I haven't given any attention to the mesh. I just generate a mesh and move to fluent to see if everything works.

[obiscolly50]

What's the purpose of the outer bounding box?

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[VictorWUR]

it's a domain flow where all the external conditions are going to be set (wind speed, temperature, humidity, radiation etc.).

The problem solved by making one multi-body!

[Kushal Puri]

Originally Posted by VictorWUR

At this point, I haven't given any attention to the mesh. I just generate a mesh and move to fluent to see if everything works.

But without knowing your mesh how can you decide why its not taking the surface as interior.

[pakk]

Originally Posted by VictorWUR

Hello everyone,

I'm trying to run a simulation of an airflow through a greenhouse for my thesis. I have designed a cube in Inventor with two separate faces (split) acting as windows. Then I imported the geometry to Design Modeller and enclosed it to a flow domain. Then I also created a surface from the face for each of the windows.

When I move to Fluent, the windows are recognised as interfaces and I can't change them to interior, so air can flow through.
Both the domain and the cube have fluid cell zones.

I'm new to fluent, any suggestions?

Kind Regards

If you a connection between two different fluid cell zones, it is an interface. Practically by definition.

But I don't understand why that is a problem...

You now replaced it by one multi-body, effectively making everything the same cell zone. That is, physically, exactly the same thing as two cell zones connected with an interface.

Gas can flow through an interface, I hope you knew that...

[VictorWUR]

Originally Posted by pakk

If you a connection between two different fluid cell zones, it is an interface. Practically by definition.

But I don't understand why that is a problem...

You now replaced it by one multi-body, effectively making everything the same cell zone. That is, physically, exactly the same thing as two cell zones connected with an interface.

Gas can flow through an interface, I hope you knew that...

No, I didn't know that.
So, interior and interface are the same?

[LuckyTran]

Originally Posted by VictorWUR

No, I didn't know that.
So, interior and interface are the same?

They act the same if there are not interface conditions (like jump conditions). Since you wanted an interior, then an interface should be okay.

You need a single cell-zone to use an interior boundary condition. Merge your two zones into one zone.

[pakk]

Originally Posted by VictorWUR

No, I didn't know that.
So, interior and interface are the same?

No, interior and interface are not the same. I think you got the idea, but you are mixing up terms.

What I say is that having two cell zones connected by an interface is physically the same as having one cell zone.
(If you don't apply jump conditions, and set the conditions for both cell zones the same).

If you connect two parts already in the mesher, you will get one cell zone (one "interior").
If you connect them after you mesh, you will get two cell zones (two "interiors") and one interface.

[VictorWUR]

OK, thanks everyone for the quick response.
I'll practice and try both ways!