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Thermal simulation of an induction machine - temperature everywhere constant

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Old   November 19, 2018, 08:50
Default Thermal simulation of an induction machine - temperature everywhere constant
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Stefan
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Hello,

First, I am an absolut beginner with Ansys. I am trying to simulate a small induction machine (~25kW). For that I used Rmxprt to create a Maxwell 2D/3D model. I used the 3D model to generate the mesh and then I loaded the mesh and the 2D solution (which looks fine in my opinion) into fluent.
The thermal distribution, I get from this, is definetly wrong as you can see on the screenshot, which is attached:
- The temperature is way to high. The coldest area is about 1000K
- The temperature is constant in the whole stator and rotor

I am guessing that it has something to do with the boundary conditions for the heat transfer?
Every help is appreciated.

Sincerly,
Ripleys
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Old   November 20, 2018, 04:05
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Google or check manual about "total temperature" - when you are doing this, read "total pressure" too.
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Old   November 26, 2018, 12:47
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Hello Maddin!

thanks for your respond.
Unfortunatly it doesnt make a difference, whether I display the "Static Temperature" or the "Total Temperature" plot.

I keep thinking, there is something wrong with the automatically generated boundary conditions. There are plenty of them sorted into Interfaces, Interiors and Walls.

Am I right, that the wall conditions are the connection between the ambient air and the parts of the induction machine? Confusingly these are the only ones where I can add a heat flux?

Thanks for any help!
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Old   November 27, 2018, 10:28
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Since I still think it has something to do with the boundary conditions, I downloaded an example for the mesh in the web.

When I assign my Maxwell 2D Solution and the mesh from the web to fluent, it shows me an wrong solution (ofc, the 2D solution is for an absolute different geometry). But it shows me an heat transfer (Ive attached an screenshot). So the problem is the mesh file.

Now Ive tried to add the missing constraints (mainly the periodic boundaries) to my file. Nothing changes. In addition I cant find a boundary, which defines the heat transfer between the coils and the stator for example?

Unfortunatly I cant upload my mesh, because the file is to big..

Anyone knows an answer for this?
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