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Flux2D: Coupled Magnetic-Thermal Simulation with Moving Geometry

Hello.
I’m working on a project in Flux2D 2023.1 which involves an induction heater that heats a moving laminated core as shon in the picture below. The application is Steady-State AC Magnetic field coupled with a Transient Thermal analysis with a 2D axisymmetric domain.

I want the laminated core to move downward over time during the heating process. Currently, I’ve created a geometric parameter to change the billet’s position, but each time the position changes, the solver restarts the thermal calculation from the beginning (0 seconds). This means the temperature always resets instead of continuing from the previous state.

Is there a way to simulate the billet moving continuously over time - such that at 0 seconds the billet is, for example,

at 0 cm, at 1 second it’s at 1 cm, at 2 seconds at 2 cm, and so on - without starting each new step from 0 seconds?

Furthermore, is it possible to export the temperature distribution from one step and use it as the initial condition for the next step?

Thank you for your time and support.

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Flux

v2023.1

Accepted answers

C_Favre

Hello,

Yes it is possible to considered motion in the steady state AC application coupled with transient thermal. For that you have to create mechanical set. It is available in the menu Physics.

In your case you need to create Three mechanical sets, one mobile defined as a translation along 0Y with an imposed speed. one fixed and one compressible. The mobile will be assigned to the face region of the moving part. the fixe will be used for all the region fixe. And the compressible should be used for the air region around the mobile part. In This case it is also better to have two air regions one for the infinite box defined with a fixe mechanical set and one compressible of the air around the billet.

I suggest you to have a look at the example translating motion in the supervisor example. It is not an induction heating problem but the way to defined the motion is very similar, except the type of the mobile mechanical set which will be imposed speed in your case instead of coupled load

I hope this helps.

Bets regards.

Cyril Favre

All comments

C_Favre

Hello,

Yes it is possible to considered motion in the steady state AC application coupled with transient thermal. For that you have to create mechanical set. It is available in the menu Physics.

I hope this helps.

Bets regards.

Cyril Favre

Danijel

Hello.
Thank you for your help. I modified my project and now i have no problem regarding the movement of the mechanical set.
But i am still wondering about the second part of my post on whether it is possible to export the temperature distribution from one step and use it as the initial condition for the next step.
In the simulation that i am working on, the billet heats up for some time and then it starts to move.
Since i can't modify when the billet starts moving, the next idea i had was to simulate the heating-up part, export the temperature distribution, import it in the unsolved project and solve for the movement part. Would that be possible? I already tried to change the initial temperature for thermal applications in the Solving process options, but the results are not accurate enough.

Thank you for your continuous support.

C_Favre

Hello,

Sorry I missed the second part of the question, did you try to use a formula in the imposed speed mechanical set that varied the speed in function of the time, for example with a low speed in the start of the computation and higher speed after a certain time? It can be done with a valid function, for example the following formula:

1E-6+1*Valid(TIME,5E-3,20E-3)

with this formula the speed will be 1e-6m/s between 0 and 5e-3 s and 1m/s+1e-6m/s after 5e-3s

For information initialized the temperature in a new project using the temperature of another one, the worflow is the following

In the first project export a dex file of the temperature in Kelvin in the region using the menu Parameter/Quantity → Export quantity → Export spatial quantity and formula. Select the region from which you wants to export the temperature, enter a name for the .dex file and select Tkelvin as formula.

In the second project (with the same mesh) you have to create a spatial quatity by importing a .dex file, it can be done using the menu Parameter/Quantity → Import parameter and quantity → New (cosntant ) tabulated spatial quantity by importation, here you need to defined a name for the spatial quantity created (Test for example) and select the .dex file created. it will create a spatial quantity from the .dex file.

Then you can go in the solving option in the menu Solving → Solving process option → Edit in the tab Thermal click on the forula editor f() in the field Initial temperature. in the formula editor in the tab user you should find your spatial formula test. If you select it and click on apply it will initialized the computation with the value of temperature you have in the Spatial quantity created from .dex file and that is the temperature coming from the first project . Please note that if you use a second spatial parameter wicjh contains temperature for an other region Flux will also initialized the temperature on the second region. You can load several spatial quantity coming from several .dex file to initialized several region.

I hope this helps.

Best regards.

Cyril Favre