Allows specification of extrusion path using blockMesh 'edges' syntax.
See tutorials/mesh/extrudeMesh/polyline

Contribution by Ivor Clifford/Paul Scherrer Institut

Uses a system/caseProperties file to select templates from
etc/caseDicts/createZeroDirectoryTemplates to enable high-level setup
of a case.
See
- etc/caseDicts/createZeroDirectoryTemplates
- tutorials/preProcessing/createZeroDirectory

SIMPLEC (SIMPLE-consistent) is selected by setting "consistent" option true/yes:

SIMPLE
{
    nNonOrthogonalCorrectors 0;
    consistent yes;
}

which relaxes the pressure in a "consistent" manner and additional
relaxation of the pressure is not generally necessary.  In addition
convergence of the p-U system is better and reliable with less
aggressive relaxation of the momentum equation, e.g. for the motorbike
tutorial:

relaxationFactors
{
    equations
    {
        U               0.9;
        k               0.7;
        omega           0.7;
    }
}

The cost per iteration is marginally higher but the convergence rate is
better so the number of iterations can be reduced.

The SIMPLEC algorithm also provides benefit for cases with large
body-forces, e.g. SRF, see tutorials/incompressible/SRFSimpleFoam/mixer
and feature request http://www.openfoam.org/mantisbt/view.php?id=1714

potentialFoam: Solve for velocity potential named Phi rather than using the pressure field for this purpose

The Phi field is read if available otherwise created automatically with
boundary conditions obtained automatically from the pressure field if
available (with optional name) otherwise inferred from the velocity
field.  Phi Laplacian scheme and solver specification are required.  See
tutorials for examples.

necessarily a flutter.

sixDoFRigidBodyDisplacement BC restraints and constraints.

Moved the snappyHexMesh tutorials to the appropriate solver directories and created links.