On 1/7/21 6:58 PM, Lixing Zhu wrote:
I implemented the local elimination as you suggested and it works. However,
this ends up with many extra "redundant" DOFs in the global system. For
example, if I am using N*N linear elements for a scalar 2D problem with
structured mesh, instead of (N+1)^2 global DOFs, I end up with (N+1)^2 + N^2
global DOFs. The extra DOFs are coming from the bubble supports. Of course,
they won't affect the solution at vertices due to the nature of bubble
functions, but such an increase of DOFs may require more memory in the
solution process. How should I also reduce the size of the global system?
Do you need to? Is memory consumption an issue for you? Unless you have a
concrete problem, it's probably not worth optimizing for.
Best
W.
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Wolfgang Bangerth email: [email protected]
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