Computational domain, consisting of the mesh and regions.
Domain is divided into groups, whose purpose is to have homogeneous data shapes.
Create a new surface group corresponding to region if it does not exist yet.
Notes
Surface groups define surface facet connectivity that is needed for sfepy.discrete.fem.mappings.SurfaceMapping.
Ensure element nodes ordering giving positive element volume.
The groups with elements of lower dimension than the space dimension are skipped.
Return the diameter of the domain.
Notes
The diameter corresponds to the Friedrichs constant.
Get the evaluate cache for Variable.evaluate_at().
Parameters: | cache : Struct instance, optional
share_geometry : bool
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Returns: | cache : Struct instance
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Return the bounding box of the underlying mesh.
Returns: | bbox : ndarray (2, dim)
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