simulation problem with fluent

[M.B]

Hello everyone,
I am making a fluent simulation on a mini fridge made in solid edge and imported.
at the base of the cooling compartment and in contact with the air I have a circular metal surface of 20 mm in diameter while the remaining surface and plastic.
Once the simulation is launched, I can obtain a congruous air temperature with reality, but the metal surface that conducts thermally more remains at room temperature when it should cool more than the remaining plastic surface.

Would someone give me some advice on how to get the surface cooling?

Thank you.

 

[WalterCFD]

Hi.
I think we need some information to help you.
that bcs impose?

walter

 

[M.B]

Hello.
thank you first for answering me... I apologize for lack of information.
Therefore, in boundary conditions I impose, between the thermal conditions, the coupling "coupled" between the wall of the metal surface and the internal volume of air that cools.
with this condition the other surfaces cool while this no, it remains at room temperature even if it is not in contact with the environment. . .

 

[WalterCFD]

So you have a shadow that "common" with the metal wall?
Are the materials just set from the point of view of the properties or have you created solid cells in the walls?
if I didn't get it wrong: Are you simulating the outside surface of the fridge that trades with the ambient air?

 

[M.B]

Yes, the shadow that communicates with the metal wall is there and has as adjacent cell zone this steel volume at the base...I have the cell zones that gave me after I set the geometry and mesh.
the geometry I imported it from solid edge and the simulation concerns the thermal exchange between evaporator and air contained in an internal volume of a fridge isolated on all walls and that it has at the base of the internal volume this metal surface of 20 mm diameter that we are talking about.

 

[WalterCFD]

Could you post a domain image with the surface?
I don't know much about refrigerators. . .

 

[M.B]

I put an image of the view in the section of the fridge I have in the attachments. I'm not sure I got it.

If you can charge it you can see at the base the steel dowel that remains at room temperature while the inside air and the rest of the surfaces cool. the evaporator is at a fixed temperature of -23°c. the fridge is contained within a volume (which is not seen here) that represents the environment at 25°c

 

[M.B]

View attachment 35152Excuse me, the image now you should be able to view it. .

 

[M.B]

I try again to insert the image several times differently, I know the forum recently...if you can't view it tell me too...thanks