Updated tutorials to converge pressure during PIMPLE loop to avoid
phase-fraction unboundedness which limits thermodynamics convergence.

twoPhaseEulerFoam/interfacialModels/turbulentDispersionModels/noTurbulentDispersion: Corrected dimension of D

twoPhaseEulerFoam/interfacialModels/turbulentDispersionModels/Burns: Corrected sign of the diffusivity

Reduces or eliminates staggering patterns due to cell-force imbalances
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1363

Improves stability and convergence of systems in which drag dominates
e.g. small particles in high-speed gas flow.

Additionally a new ddtPhiCorr strategy is included in which correction
is applied only where the phases are nearly pure.  This reduces
staggering patters near the free-surface of bubble-column simulations.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1421

to avoid excessive pressure/buoyancy balance errors on non-orthogonal meshes

twoPhaseEulerFoam JohnsonJacksonFrictionalStress: alphaDeltaMax now user input (previously hard-coded to 5e-2)

to avoid excessive pressure/buoyancy balance errors on non-orthogonal meshes
Resolves bug-report http://openfoam.org/mantisbt/view.php?id=1379

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.

Correction provided by Juho Peltola

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

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

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.

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

Use interFoam with fvOptions

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

Explicitly name derived fields to improve readability of diagnostic messages and avoid duplicate registration

Avoids problem of duplicate registration

twoPhaseEulerFoam/twoPhaseSystem/diameterModels/constantDiameter: Do not register the temporary diameter field