On 7/20/21 8:07 PM, Lixing Zhu wrote:
However, I am trying to implement some stabilization technique that involves
2nd order derivatives of the shape function, like the divergence of the
symmetric gradient of the displacement vector (actually, the shape function).
For now, I can only think of selecting the components from the Hessian of the
shape function to compute the div of the symmetric gradient. Is there any way
in deal.ii to directly extract such values like divergence of the symmetric
gradient of shape functions?
There is no easy way. You'll have to compute the tensor of second derivatives
and sum over the appropriate set of elements.
Best
W.
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Wolfgang Bangerth email: [email protected]
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