Hello Thomas,
the library only provides derivatives up to 2nd order. To obtain higher
orders the easiest way probably is to use some approximate gradient
formula like in finite differences.
Best Regards,
Markus
Am 30.01.2012 09:08, schrieb Thomas Amler:
Dear deal II users,
Is there a way to access higher than second order derivatives of
discontinuous shape functions?
I saw in the documentation that FEValuesBase can provide 1st and 2nd
order derivatives. If there is another class or a tutorial I haven't
found where this is demonstrated, please let me know.
Why this: The problem I am interested in is wave propagation and I
read in a paper that the accuracy of DG methods can be higher than the
one of spectral methods if the polynomial degree of the DG method is
higher than the order the time stepping scheme in the spectral method.
However, the DG method requires higher derivatives..
Any help is appreciated.
Regards,
Tom
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