Why simulated currents inside a magnetic shield in 3D don’t match 2D (cylindrical around z) results?

    • dg2073

      I am working with ANSYS Electronics Desktop simulating a current in a magnetic shield. In trying to verify the accuracy of the simulations, I am comparing the magnetic fields generated from a current carrying circular loop of copper wire inside a cylindrical shell magnetic shield made of mu-metal with a custom relative permeability of 10^8. I simulated this in two different Ansys geometries, cylindrical around z (2D) and cartesian (3D). The cylindrical around z solution agrees very well with an analytic theory from literature. However, the 3D simulation does not agree to the degree of accuracy expected or required for our purposes. One of the troubling aspects is there is significant magnetic field leakage outside the high permeability magnetic shield for 3D but not 2D. Does anyone know what the problem could be? I have refined the mesh, decreased the energy error tolerance, and thickened the shield, but none of these solve the issue.

    • Navya C
      Ansys Employee
      Hi @dg2073 Increase the region size in 3D simulation and see if the resut is changing. If it is changing the reason could be that region is not sufficient enough. Then increase the region till the point you see there is no change in the result.
      Also, use fine mesh by moving the slider to the right in the initial mesh settings
      As long as the region is sufficient enough to cover the whole field distribution you should get the same result for anything Region size above that region size.
      But if you set the computational region such that it is not fully enclosing the whole magnetic field you will get a difference in results.

      Regards Navya
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