Hello,

I have a question regarding the surface normal vector when using the term:

dw_surface_flux

In my problem, I have an interface between two materials. For each material, the weak form contains the above term. Now, I have defined the interface as a facet region, and I pass this to the term in both equations. I think that the normal vector for the surface in the respective materials is not defined. How can I define this?

Best regards,
Nikhil