## Materials

#### Superconducting materials

• Minhazur Rahman
Subscriber

I would like to simulate a superconducting coil of NbTi but I dont see it as a material option.

How can I go about doing that? I have tried making a custom material but I don't think it is giving me accurate results:

Relative Permeability: 1e-09 Bulk Conductivity: 100,000,000,000 and I am using magnetostatic solution.

• Bill Bulat
Ansys Employee

What is your analysis objective? Are you trying to calculate JXB Lorentz forces in the volume of the superconductor in a device (e.g., Tokamak fusion reactor coils, MRI field coil)? Or are you trying to simulate the Meissner Effect which occurs when the superconductor is cooled so that it transitions from a normal conduction state to a superconducting one?

Meissner effect - Wikipedia

I have no recollection of anyone ever trying to simulate the London depth at the surface of a superconductor and I doubt our technology is capable of doing so.

We usually define a flux parallel boundary on the surface of a superconductor to model its effect on the surrounding field and don't concern ourselves with what's happening inside the superconducting domain. Actually, the superconductor is usually not modeled at all - it can be represented by a void in the modeled domain with flux parallel boundary condictions imposed on the void boundaries.

Including modeled representation of a superconducting body with properties like yours may result in a poorly conditioned system matrix - the magnitudes of the properties may be too different from those assigned to other regions in the model for machine precision to calculate accurately.

Kind regards,

Bill

• Minhazur Rahman
Subscriber

Great, thank you. I am trying to replicate the B field, for a given current, within a coil of superconducting wire similar to an MRI. Are there any MRI/Tokamak/other projects I can examine?

• Minhazur Rahman
Subscriber
Great, thank you. I am trying to replicate the B field, for a given current, within a coil of superconducting wire similar to an MRI. Are there any MRI/Tokamak/other projects I can examine?