Solving 2D FEM Error with Maxwell Version 17

[Morteza]

Hi,

I am working on Maxwell version 17. I have a simple motor to analysis 2D FEM.
However, when I analyze the model, I see this error.

"Maxwell2d solver, process solver2d error: Internal Solver Error: 'Transient solver handles only isotropic conductivity!'. (7:07:10 PM Apr 16, 2018)"

I am thankful if you help me.

Regards.

 

[jsgruszynski]

Hi,

I am working on Maxwell version 17. I have a simple motor to analysis 2D FEM.
However, when I analyze the model, I see this error.

"Maxwell2d solver, process solver2d error: Internal Solver Error: 'Transient solver handles only isotropic conductivity!'. (7:07:10 PM Apr 16, 2018)"

I am thankful if you help me.

Regards.

I'm not an Ansys user but I do use Comsol which does similar things.

What this is saying is one of your materials has been defined to have anisotropic properties but the solver doesn't know how to do tensor algebra (which would be required). It's just bailing out as soon as it sees what it can't solve.

This is probably due to one of two scenarios

1. You actually wanted to simulate an anisotropic material - basically you can't do that (as the program say). It's possible, based on the error, that a steady-state simulation could be solved with an anisotropic material but I honestly don't know - I'm inferring this from the error message
2. You accidentally setup a material as being anisotropic without realizing it and the material is actually isotropic - you have to set it to being isotropic

Most materials are isotropic - if you apply some force X, in any direction, you get a corresponding Y response in the same direction. Hence my suspicion for #2.

https://en.wikipedia.org/wiki/Isotropy

https://en.wikipedia.org/wiki/Anisotropy

Examples of anisotropic materials include:

1. Piezoelectric materials
2. Pyroelectric materials
3. Materials with anisotropic strain relationships such a non-Newtonian fluids, etc.