Hi Christopher,
Thank you for the reply.
To be honest, I’m still a little confused. We’re currently interested in high order HCurl problems where we need a dense mesh in order to capture the geometric information of our model. Following the ideas from this post, our intention was to use the BDDC preconditioner to eliminate the higher order dofs, and then rather than perform a direct solve on the lowest order dofs, which for a dense mesh would still require a large amount of memory, we would instead use h-version multigrid in a similar way to Tutorial 2.1.4. This still seems like a sensible idea to me, but maybe I’ve misunderstood what the multigrid for the lowest order dofs is doing.
James