PeriodicBoundaryComputation

class dolfin.cpp.mesh.PeriodicBoundaryComputation

Bases: object

This class computes map from slave entity to master entity.

static compute_periodic_pairs()

For entities of dimension dim, compute map from a slave entity on this process (local index) to its master entity (owning process, local index on owner). If a master entity is shared by processes, only one of the owning processes is returned.

Parameters:

• Mesh & mesh (const) –
• SubDomain & sub_domain (const) –
• std::size_t dim (const) –

Return type:

std::map< unsigned int, std::pair< unsigned int, unsigned int > >

static masters_slaves()

This function returns a MeshFunction which marks mesh entities of dimension dim according to:

2: slave entities
1: master entities
0: all other entities

It is useful for visualising and debugging the Expression::map function that is used to apply periodic boundary conditions.

Parameters:

• const Mesh > mesh (std::shared_ptr<) –
• SubDomain & sub_domain (const) –
• std::size_t dim (const) –

Return type:

MeshFunction< std::size_t >

thisown

The membership flag