The defaultCoeffs entry is now redundant and supported only for backward
compatibility.  To specify a liquid with default coefficients simply leave the
coefficients dictionary empty:

    liquids
    {
        H2O {}
    }

Any or all of the coefficients may be overridden by specifying the properties in
the coefficients dictionary, e.g.

    liquids
    {
        H2O
        {
            rho
            {
                a 1000;
                b 0;
                c 0;
                d 0;
            }
        }
    }

When liquids are constructed from dictionary the coefficients are now first
initialized to their standard values and overridden by the now optional entries
provided in the dictionary.  For example to specify water with all the standard
temperature varying properties but override only the density with a constant
value of 1000 specify in thermophysicalProperties

liquids
{
    H2O
    {
        defaultCoeffs   no;

        H2OCoeffs
        {
            rho
            {
                a 1000;
                b 0;
                c 0;
                d 0;
            }
        }
    }
}

The fundamental properties provided by the specie class hierarchy were
mole-based, i.e. provide the properties per mole whereas the fundamental
properties provided by the liquidProperties and solidProperties classes are
mass-based, i.e. per unit mass.  This inconsistency made it impossible to
instantiate the thermodynamics packages (rhoThermo, psiThermo) used by the FV
transport solvers on liquidProperties.  In order to combine VoF with film and/or
Lagrangian models it is essential that the physical propertied of the three
representations of the liquid are consistent which means that it is necessary to
instantiate the thermodynamics packages on liquidProperties.  This requires
either liquidProperties to be rewritten mole-based or the specie classes to be
rewritten mass-based.  Given that most of OpenFOAM solvers operate
mass-based (solve for mass-fractions and provide mass-fractions to sub-models it
is more consistent and efficien...

functionObjects::scalarTransport: Added support for optional laminar and turbulent diffusion coefficients

Description
    Evolves a passive scalar transport equation.

    - To specify the field name set the \c field entry
    - To employ the same numerical schemes as another field set
      the \c schemesField entry,
    - A constant diffusivity may be specified with the \c D entry,

    - Alternatively if a turbulence model is available a turbulent diffusivity
      may be constructed from the laminar and turbulent viscosities using the
      optional diffusivity coefficients \c alphaD and \c alphaDt (which default
      to 1):
      \verbatim
          D = alphaD*nu + alphaDt*nut
      \endverbatim

Resolves feature request https://bugs.openfoam.org/view.php?id=2453

Resolves bug-report https://bugs.openfoam.org/view.php?id=2455

Now the interFoam and compressibleInterFoam families of solvers use the same
alphaEqn formulation and supporting all of the MULES options without
code-duplication.

The semi-implicit MULES support allows running with significantly larger
time-steps but this does reduce the interface sharpness.

Description
    Simple solidification porosity model

    This is a simple approximation to solidification where the solid phase
    is represented as a porous blockage with the drag-coefficient evaluated from

        \f[
            S = - \alpha \rho D(T) U
        \f]

    where
    \vartable
        \alpha  | Optional phase-fraction of solidifying phase
        D(T)    | User-defined drag-coefficient as function of temperature
    \endvartable

    Note that the latent heat of solidification is not included and the
    temperature is unchanged by the modelled change of phase.

    Example of the solidification model specification:
    \verbatim
        type            solidification;

        solidificationCoeffs
        {
            // Solidify between 330K and 330.5K
            D table
            (
                (330.0     10000) // Solid below 330K
                (330.5     0)     // Liquid above 330.5K
            );

            // Optional phase-fraction of solidifying phase
            alpha alpha.liquid;

            // Solidification porosity is isotropic
            // use the global coordinate system
            coordinateSystem
            {
                type    cartesian;
                origin  (0 0 0);
                coordinateRotation
                {
                    type    axesRotation;
                    e1      (1 0 0);
                    e2      (0 1 0);
                }
            }
        }
    \endverbatim

Description
    Simple solidification porosity model

    This is a simple approximation to solidification where the solid phase
    is represented as a porous blockage with the drag-coefficient evaluated from

        \f[
            S = - \rho D(T) U
        \f]

    where
    \vartable
        D(T) | User-defined drag-coefficient as function of temperature
    \endvartable

    Note that the latent heat of solidification is not included and the
    temperature is unchanged by the modelled change of phase.

    Example of the solidification model specification:
    \verbatim
        type            solidification;

        solidificationCoeffs
        {
            // Solidify between 330K and 330.5K
            D table
            (
                (330.0     10000) // Solid below 330K
                (330.5     0)     // Liquid above 330.5K
            );

            // Solidification porosity is isotropic
            // use the global coordinate system
            coordinateSystem
            {
                type    cartesian;
                origin  (0 0 0);
                coordinateRotation
                {
                    type    axesRotation;
                    e1      (1 0 0);
                    e2      (0 1 0);
                }
            }
        }
    \endverbatim

Patch contributed by Timo Niemi, VTT.
Resolves patch request https://bugs.openfoam.org/view.php?id=2452

if convergence is not achieved within the maximum number of iterations.

Sometimes, particularly running in parallel, PBiCG fails to converge or diverges
without warning or obvious cause leaving a solution field containing significant
errors which can cause divergence of the application.  PBiCGStab is more robust
and does not suffer from the problems encountered with PBiCG.

Compressing and decompressing binary files introduces a significant IO overhead
without a providing significant reduction in file-size.

Patch contributed by Mattijs Janssens

Patch contributed by Mattijs Janssens

kOmegaSSTSato: Change correctNut() to correctNut(S2, F2)

Resolves bug-report https://bugs.openfoam.org/view.php?id=2450

Patch contributed by Juho Peltola, VTT
Resolves patch request https://bugs.openfoam.org/view.php?id=2446

Patch contributed by Juho Peltola, VTT.
Resolves patch request https://bugs.openfoam.org/view.php?id=2443

Patch contributed by Bruno Santos
Resolves bug-report https://bugs.openfoam.org/view.php?id=2441

Patch contributed by Bruno Santos
Resolves patch request https://bugs.openfoam.org/view.php?id=2444

Patch contributed by Bruno Santos
Resolves patch request https://bugs.openfoam.org/view.php?id=2424

Patch contributed by Timo Niemi, VTT.
Resolves bug-report https://bugs.openfoam.org/view.php?id=2442

The previous time-step compression flux is not valid/accurate on the new mesh
and it is better to re-calculate it rather than map it from the previous mesh to
the new mesh.