Hi,
Since several XFEM papers formulate this as a Heaviside enrichment around the
crack, you might find this class useful:
https://www.dealii.org/current/doxygen/deal.II/classFE__Enriched.html
Relating to Wolfgangs answer, note in particular the section "Using enriched and
non-enriched FEs together".
Best,
Simon
On 18/06/2022 07:43, Wolfgang Bangerth wrote:
Wang Yuan,
I am using extended finite element method to do crack expansion. I have a
question, can I increase the degree of freedom for the nodes designated around
the crack in Deal?
Not easily. deal.II enumerates degrees of freedom based on the finite element
used on a cell, so if you want to have extra degrees of freedom, you need to
describe that by using a different element on that cell (using the
hp-framework, in the same way as step-46 for example).
Meanwhile, another question is can I assign different numbers of Gaussian
integral points to different elements? Thank you for your help!
Yes! You can use a hp::QCollection together with hp::FEValues. Or you can do it
by hand: You create multiple quadrature rules and corresponding FEValues
objects, and then you choose which one is appropriate when you are on a
concrete cell.
Best
W.
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