QUADRATURE, order

Defines order of the Gauss quadrature. Possible values are two or three. Note that in the u-p mixed formulation the reduced integration is always used, i.e., volumetric terms and terms containing the extra interpolated pressure p are integrated always by order of two.

Order Maximal order* Integration points
2 3 6
3 5 14

*Maximal order of exactly integrated polynomial