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.

snappyHexMesh: Added "noRefinement" writeFlag to control the writing of cellLevel, pointLevel etc. files

By default snappyHexMesh writes files relating to the hex-splitting process into
the polyMesh directory: cellLevel level0Edge pointLevel surfaceIndex

but by setting the noRefinement flag:

writeFlags
(
    noRefinement
    .
    .
    .
);

these optional files which are generally not needed are not written.

If you run the three stages of snappyHexMesh separately or run a dynamic mesh
solver supporting refinement and unrefinement these files are needed
and "noRefinement" should not be set.

unless the blockMeshDict is in the polyMesh directory or the "-noClean" option
is specified.

This avoids problems running snappyHexMesh without first clearing files from
polyMesh which interfere with the operation of snappyHexMesh.

The files relating to the hex refinement are written out explicitly both by
snappyHexMesh and dynamicRefineFvMesh and hence should be set "NO_WRITE" rather
than "AUTO_WRITE" to avoid writing them twice.  This change corrects the
handling of the "refinementHistory" file which should not be written by
snappyHexMesh.

To run with laminar reaction rates choose the "laminar" combustion model rather
than setting "turbulentReaction no;" in the "PaSR" model.

Resolves bug-report https://bugs.openfoam.org/view.php?id=2428

Resolves bug-report https://bugs.openfoam.org/view.php?id=2438

Patch contributed by Bruno Santos
Resolves bug-report https://bugs.openfoam.org/view.php?id=2437

Resolves bug-report https://bugs.openfoam.org/view.php?id=2436

Avoids slight phase-fraction unboundedness at entertainment BCs and improved
robustness.

Additionally the phase-fractions in the multi-phase (rather than two-phase)
solvers are adjusted to avoid the slow growth of inconsistency ("drift") caused
by solving for all of the phase-fractions rather than deriving one from the
others.

tutorials/combustion/reactingFoam/laminar/counterFlowFlame2D_GRI_TDAC: Added deltaT to TDAC controls

Patch contributed by zhulianhua
Resolves bug-report https://bugs.openfoam.org/view.php?id=2427

Starting from an negative initial temperature causes non-convergence and a
misleading error, now a specific message is generated.

e.g.

fieldMinMax fieldMinMax write:
    min(T) = 291 in cell 255535 at location (-0.262546 -0.538933 1.00574) on processor 9
    max(T) = 336.298 in cell 419031 at location (1.7468 0.758405 8.10989) on processor 1
    min(mag(U)) = 0 in cell 14990 at location (-0.0824383 1.68479 1.5349) on processor 0
    max(mag(U)) = 652.341 in cell 218284 at location (0.609849 0.167247 1.00091) on processor 12

Patch contributed by Bruno Santos
Resolves bug-report https://bugs.openfoam.org/view.php?id=2431

Patch contributed by Karl Meredith, FM Global.

Patch contributed by Bruno Santos
Resolves patch request https://bugs.openfoam.org/view.php?id=2423