I have a question about coupling a magnetic study to a solid mechanics study.
I attach to this email a simple model to explain my question. In the model you can find a permanent magnet with a round soft-iron path to guide the magnetic flux, and an air gap (and an air volume surrounding it). I added electromagnetic physics and solid mechanics physics, and I would like to perform a fully coupled study. That is, the magnet generates magnetic flux, which in the air-gap generates a force. That force deforms the soft-iron, therefore reducing the air-gap and increasing the flux. Thus, there is 2 couplings: the magnetic force deforms the solid object, and the deformations change the magnetic path.
What I see when running the simulation (study 3) is that I can indeed deform the structure thanks to the magnetic force. Nevertheless, I don’t think the magnetic flux is being recalculated after the deformation. To verify this I added a boundary load to the solid mechanics physics which pushes the air-gap closed. When performing the simulation, I do see a difference in the deformation, but I see no difference in the flux (you can check it with the surface average node in the derived values). The same happens if I chance the young modulus of the soft –iron, even to un-realistic values: no matter the final size of the air-gap, the flux doesn’t change. I tried a fully coupled study (instead of segregated) and get the same result.
Do you know what am I doing wrong?
A second question is that when I run the simulation with a force of 0 or 200N (you can change it in the parameters) it runs fast and easy, but if I try a parametric study with those 2 values, it gets stuck. You can see it in the study 2.
I attach to this email a simple model to explain my question. In the model you can find a permanent magnet with a round soft-iron path to guide the magnetic flux, and an air gap (and an air volume surrounding it). I added electromagnetic physics and solid mechanics physics, and I would like to perform a fully coupled study. That is, the magnet generates magnetic flux, which in the air-gap generates a force. That force deforms the soft-iron, therefore reducing the air-gap and increasing the flux. Thus, there is 2 couplings: the magnetic force deforms the solid object, and the deformations change the magnetic path.
What I see when running the simulation (study 3) is that I can indeed deform the structure thanks to the magnetic force. Nevertheless, I don’t think the magnetic flux is being recalculated after the deformation. To verify this I added a boundary load to the solid mechanics physics which pushes the air-gap closed. When performing the simulation, I do see a difference in the deformation, but I see no difference in the flux (you can check it with the surface average node in the derived values). The same happens if I chance the young modulus of the soft –iron, even to un-realistic values: no matter the final size of the air-gap, the flux doesn’t change. I tried a fully coupled study (instead of segregated) and get the same result.
Do you know what am I doing wrong?
A second question is that when I run the simulation with a force of 0 or 200N (you can change it in the parameters) it runs fast and easy, but if I try a parametric study with those 2 values, it gets stuck. You can see it in the study 2.