Xfem manager record and associated records
This record specifies the number of enrichment items and simulation options
common for all enrichment items. Functions used for enrichment (e.g. Heaviside,
abs or branch functions) are not specified here, they are specified for each
enrichment item separately. The same holds for the geometrical representation of
each enrichment item (e.g. a polygon line or a circle). Currently, OOFEM
supports XFEM simulations of cracks and material interfaces in 2D. The input
format for the XFEM manager is:
| XfemManager |
numberofenrichmentitems #(in) |
|
|
numberofgppertri #(in) |
|
|
debugvtk #(in) |
|
|
vtkexport #(in) |
|
|
exportfields #(in) |
where numberofenrichmentitems represents number of enrichment items,
numberofgppertri denotes the number of Gauss points in each subtriangle
of a cut element (default 12) and debugvtk controls if additional debug
vtk files should be written (1 activates the option, 0 is default).
The specification of an enrichment item may consist of several lines, see e.g.
the test sm/xFemCrackValBranch.in. First, the enrichment item type is
specified together with some optional parameters according to
| *EntType |
(num#)(in) |
|
|
enrichmentfront #(in) |
|
|
propagationlaw #(in) |
where enrichmentfront specifies an enrichment front (we may for example
employ branch functions at a crack tip and Heaviside enrichment along the rest
of the crack, hence the ``front'' of the enrichment is treated separately) and
propagationlaw specifies a rule for crack propagation (this feature is
still highly experimental though). Specification of an enrichmentfront
and a propagationlaw is optional.
The next line specifies the enrichment function to be used:
This is followed by a line specifying the geometric description (e.g. a polygon
line or a circle) according to
| *EntType |
(num#)(in) extra attributes |
where the number and type of extra attributes to specify will vary depending on the
geometry chosen, e.g. center and radius for a circle or a number of points for a
polygon line.
If an enrichment front was specified previously, the type and properties of the
enrichment front are specified on the next line according to
| *EntType |
(num#)(in) extra attributes |
If a propagation law was specified previously, it's type and properties are also
specified on a separate line according to
| *EntType |
(num#)(in) extra attributes |
Borek Patzak
2018-01-02
