Locating Default Neumann Boundary Conditions in OpenCARP Source Code

Question

Hi everyone,

I'm new to OpenCARP and have a question about boundary conditions. In the OpenCARP manual, it states that homogeneous Neumann boundary conditions are applied by default (pages 22, 24, and 143). I also saw confirmation of this in a response on the forum (https://opencarp.org/q2a/560/what-are-the-default-boundary-conditions-used-in-opencarp). However, I haven't been able to locate where exactly these default boundary conditions are implemented in the source code.

If anyone could point me to the relevant part of the code or offer any additional guidance on this, I’d greatly appreciate it.

Thank you all!

Best regards,
Estela

Answer 1

Hi!

You will not find anything on that in the code. The zero current outflow is applied implicitely. As such, the associated term when treating the variational formulation of the elliptic PDE is set to zero, and thus does not contribute to the assembled system.

Best, Aurel