Re: [Libmesh-users] Applying an Inter-element Neumann Boundary Condition

[David K. <dknez@MIT.EDU>]

Ted Kord wrote:
> Hi
>
> How do I apply a Neumann B.C at an inter-element boundary?
>   

The same way as a usual Neumann BC... the only trick is that you have to 
find which internal element to apply it to. One way to do this would be 
to set the subdomain_id of elements on one side of the inter-element 
boundary to 1 and on the other side to 2, and then search for elements 
with subdomain_id = 1 that have a neighbor with subdomain_id = 2, and 
apply the Neumann BC to the appropriate side of those elements.