Allows the specification of a reference height, for example the height
of the free-surface in a VoF simulation, which reduces the range of p_rgh.

hRef is a uniformDimensionedScalarField specified via the constant/hRef
file, equivalent to the way in which g is specified, so that it can be
looked-up from the database.  For example see the constant/hRef file in
the DTCHull LTSInterFoam and interDyMFoam cases.

Disadvantage is that the BC values have to be specified in terms of hU
rather than U.  The alternative would be to add complex code to map h
and U BCs into the equivalent for hU.
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1566

This reverts commit c935f83e.

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1548

Correction provided by Juho Peltola

This reverts commit f5d26ab6.

This reverts commit 49fbe73a.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1563

Resolved bug-report http://www.openfoam.org/mantisbt/view.php?id=1564

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1552

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1548

This is an experimental feature demonstrating the potential of MULES to
create bounded solution which are 2nd-order in time AND space.

Crank-Nicolson may be selected on U and/or alpha but will only be fully
2nd-order if used on both within the PIMPLE-loop to converge the
interaction between the flux and phase-fraction.  Note also that
Crank-Nicolson may not be used with sub-cycling but all the features of
semi-implicit MULES are available in particular MULESCorr and
alphaApplyPrevCorr.

Examples of ddt specification:

ddtSchemes
{
    default         Euler;
}

ddtSchemes
{
    default         CrankNicolson 0.9;
}

ddtSchemes
{
    default         none;
    ddt(alpha)      CrankNicolson 0.9;
    ddt(rho,U)      CrankNicolson 0.9;
}

ddtSchemes
{
    default         none;
    ddt(alpha)      Euler;
    ddt(rho,U)      CrankNicolson 0.9;
}

ddtSchemes
{
    default         none;
    ddt(alpha)      CrankNicolson 0.9;
    ddt(rho,U)      Euler;
}

In these examples a small amount of off-centering in used to stabilize
the Crank-Nicolson scheme.  Also the specification for alpha1 is via the
generic phase-fraction name to ensure in multiphase solvers (when
Crank-Nicolson support is added) the scheme is identical for all phase
fractions.

Uses a form of the Euler equation in which only variation along the streamlines is considered

Pass the phase-name through hierarchy
Add phase-name to variables
Split basicCombustionMixture
Update applications accordingly

Needed to create generic compressible turbulence model library

compressibleInterDyMFoam and interPhaseChangeDyMFoam: cache divU before time advancement to ensure the old-time meshPhi are used to make phi absolute
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1531

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.

Use interFoam with fvOptions

Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1382

Updated mesh-motion functionality