dune-spgrid 2.8.0.dev20210318

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Dune-SPGrid

The DUNE module dune-spgrid provides a structured, parallel grid: SPGrid.

Features

The following table compares the features of SPGrid to those of SGrid and YaspGrid:

	YaspGrid	SPGrid
Can communicate on codimensions	all	all
Coordinate type is template parameter	yes	yes
Supports anisotropic refinement	no	yes
Supports periodic boundary conditions	no[^1]	yes
Supports non-blocking communication	no	yes
Supports tensor-product grids	yes	no

[^1]: YaspGrid supports a different concept of periodicity.

SPGrid supports different (global) refinement techniques, selected by a template parameter. Some refinement techniques allow an optional parameter, the refinement policy, to be passed to globalRefine. Currently, isotropic, anisotropic and bisection refinement are supported, but this list can be extended by downstream modules. By default, isotropic refinement is used.

If no policy is given, both, isotropic and anisotropic refinement, split each cube into $2^dim$ child cubes. For anisotropic refinement, a policy may be used to say which directions to split.

Bisection refinement always splits a cube into $2$ child cubes; the split direction can be given by the policy. If no policy is given, the split directions are cycled through.

Note: SPGrid does not support tensor-product grids, as YaspGrid does. This feature can be added by a metagrid layer, if desired.

Preprocessor Magic

SPGrid can be used through the preprocessor magic. The following table shows how to select different variants of SPGrid:

GRIDTYPE	Refinement
SPGRID	Default (Isotropic)
SPGRID_SERIAL	Default (Isotropic, no MPI)
SPGRID_ISOTROPIC	Isotropic
SPGRID_ISOTROPIC_SERIAL	Isotropic (no MPI)
SPGRID_ANISOTROPIC	Anisotropic
SPGRID_ANISOTROPIC_SERIAL	Anisotropic (no MPI)
SPGRID_BISECTION	Bisection
SPGRID_BISECTION_SERIAL	Bisection (no MPI)
SPGRID_COUNT_FLOPS	use Dune::Fem::Double as ctype

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