On 4/12/19 8:41 AM, Robert Spartus wrote:
>
> That is some fascinating information! It seems like step-44, for
> instance, does not follow this recommendation, as there the polynomial
> degree is 2, while the quadrature degree is 3
Actually, Gauss quadrature with degree+1 points in each direction is
sufficient to retain the convergence order of the finite element in
question, on any kind of mesh. Using higher order quadrature formulas
might increase the *absolute accuracy*, but is not necessary for the
convergence *order*.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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