enablegridgeometrycache

Bernd Flemisch authored Oct 09, 2019 and Katharina Heck committed Oct 10, 2019

Treat files where old names are deprecated.

Constructing a geometry may be expensive depending on the grid
implementation.

Remove double/tripple ingroups and correct some doxygen-links

Mpfa contributed by DennisGlaeser

Use the `DUNE_VERSION*` macros to distinguish between Dune >= 2.6
and < 2.6. Employ the correspondingly correct types, constructors
and function calls for Mappers and ReferenceElements.

* number of inner scvfs is element.subEntities(dim-1), not element.subEntities(1)

* Use static arrays and resize vectors before usage
* Make scv/scvf default constructible
* Remove unused elementMap
* Remark: Geomtryhelper only implemented for 2d for now!

Dennis Gläser authored Jul 19, 2016 and Timo Koch committed Nov 23, 2016

The scv and scvf base classes now get the actual implementation
as a template parameter and serve as an interface for scv and scvf
implementations. Furthermore, the box scv and scvf does not store a geometry
anymore, but only the corner points. The geometry is built on the fly if requested.
The BoxGeometryHelper is adjusted to this new concept, as well as the global and
element-fvgeometry.

(cherry picked from commit 8b55b5d6db4414e57072ed05b8903a5ec49b0ee5)

There are a restriction of the global vector obtained
by a localView call and then bound to an element.

The global object can create an empty temporary local object that
can be bound to an element/stencil. This is closer to the
current dumux-stable implementation and still allows to switch
between global caching (for smaller problems where memory is not an issue)
and local caching (variables are precomputed for each element assemble temporarily)

Works for cc and box (in 2d). Box needs some performance improvement,
probably when creating the box geometries. But also other parts
might be possbile to optimize.