[ff3d-users] Help with setting Boundary conditions

[Juzar Thingna]

Hello Everyone,

I would like to solve the modified Helmholtz equation on a rectangular
domain which is divided into 2 parts by a surface at x=0.


I would like to know how can I set the following boundary conditions on the
separating surface?

I would like the derivative from one side to be equal to the derivative from
the other side + a constant

dnu(u){for x<0}=dnu(u){for x>0}+c

and I would like to have continuity of the function across this surface.

Please could someone guide me how to set this boundary condition.

Regards,

Juzar Thingna
Department of Physics,
Center for Computation Science and Engineering,
National University of Singapore.