Difference assembly dolfin vs dolfinx

dokken · August 10, 2023, 2:38pm

As you can see in

GLL fixes Runge’s phenomenon that is experienced with equispaced elements, thus that is what is used under the hood in dolfinx as default:

github.com

FEniCS/basix/blob/main/python/basix/ufl.py#L1287


      
              return self.sub_element.element_family
          
          @property
          def cell_type(self) -> _basix.CellType:
              """Basix cell type used to initialise the element."""
              return self.sub_element.cell_type
          
          @property
          def discontinuous(self) -> bool:
              """True if the discontinuous version of the element is used."""
              return self.sub_element.discontinuous
          
          @property
          def interpolation_nderivs(self) -> int:
              """The number of derivatives needed when interpolating."""
              return self.sub_element.interpolation_nderivs
          
          @property
          def map_type(self) -> _basix.MapType:
              """The Basix map type."""
              return self.sub_element.map_type

Old dolfin uses equispaced elements.

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Difference assembly dolfin vs dolfinx

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