How do I do boundary conditions where the normal derivative is set to 0 when solving differential equations?

Thank you for your help.

How do I do boundary conditions where the normal derivative is set to 0 when solving differential equations?

Thank you for your help.

When you force the value of the derivative to be a certain value, you are using a **Neumann** boundary condition.

In FEM, the Neumann boundary condition appear directly into the equation. You can find some examples on how to do that in the documentation.

I’m not completely sure about this, but my experience has been if you don’t explicitly use any condition on a boundary then the normal derivative becomes zero on that boundary.