Learning Forum

[Chavdar]

Hi,

In Maxwell 3D when you output a vector field on a regular 3D grid what kind of interpolation method is used? I cannot see that information anywhere and it is very important.

Does the interpolation preserve Maxwell's equations?

Best regards

[GLUO]

Hi @Chavdar,

In Fields Calculator, we use Lagrange basis functions for interpolation, with barycentric coordinates for tetrahedral and triangle elements. To calculate the value of any expression at a point, we first find the barycentric coordinates for that point and then perform the evaluation. From Maxwell solvers, most field quantities are represented in 2^nd order polynomial over the elements. In Fields Calculator, if further operations are involved, the order of the expression might be higher.

GLUO

[Chavdar]

Hi Gluo,

Please excuse me, maybe my question was not clear enough.

I meant, what is the interpolation method when using the python interface to export the field on a regular grid : https://aedt.docs.pyansys.com/release/0.6/API/_autosummary/pyaedt.modules.AdvancedPostProcessing.PostProcessor.export_field_file_on_grid.html

If it is the same interpolation method then my question is: Does this type of interpolation preserve the Maxwellian properties of the fields (divergence of the B field should be zero and curl should be zero in points where there is no current density)?

Regards,

Chavdar