Joel, On Thursday, August 11, 2016 at 11:29:35 AM UTC-4, Joel Davidsson wrote: > > > I just had a question about the third option. If one used FE_Nothing, what > is the boundary that is used when doing calculations? Is it the boundary of > the big box or the green box? Is this handle automatically or does one need > to mark the green box with boundary indicator for example. > It will be the boundary on the big box and you can't use boundary indicator because you are not on the boundary. The boundary is a geometric "quantity", it doesn't care about the type of finite elements you are using. So if you want to use Dirichlet "boundary" condition on the green box, you need to build the ConstraintMatrix yourself.
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