The new algorithm provides robust quality triangulations of non-convex
polygons. It also produces a best attempt for polygons that are badly
warped or self intersecting by minimising the area in which the local
normal is in the opposite direction to the overal polygon normal. It is
memory efficient when applied to multiple polygons as it maintains and
reuses its workspace.
This algorithm replaces implementations in the face and
faceTriangulation classes, which have been removed.
Faces can no longer be decomposed into mixtures of tris and
quadrilaterals. Polygonal faces with more than 4 sides are now
decomposed into triangles in foamToVTK and in paraFoam.
The FOAM file format has not changed from version 2.0 in many years and so there
is no longer a need for the 'version' entry in the FoamFile header to be
required and to reduce unnecessary clutter it is now optional, defaulting to the
current file format 2.0.
Solving for enthalpy provides better convergence and stability than internal
energy. Also correctPhi is now off pending the addition of compressibility
effects to the pcorr equation.
to differentiate between flux field which require face-flipping and
non-extensive surface fields which do not. Currently flux fields are
distinguished by being surfaceScalarField with dimensions of either volumetric
or mass flux.
This change corrects the handling of the surfaceVectorField Uf which was
previously mapped incorrectly on faces requiring the flipping of the flux
orientation.
for example
cellZoneInside inside;
becomes
mode inside;
in snappyHexMeshDict
Support for the previous name 'cellZoneInside' is maintained for backward
compatibility.
The writer class has been renamed setWriter in order to clarify its
usage. The coordSet and setWriter classes have been moved into the
sampling library, as this fits their usage.
The new write functions are currently being utilised by setSet and the
vtkSurfaceWriter, but it should eventually be possible for more examples
of VTK poly data writing to be converted to use these functions.
This new constraint type is preferable to the 'empty' type used previously as it
support patch field values for post-processing and other purposes.
The internalFvPatchField operates as a 'zeroGradient' type so that the adjacent
cell values are displayed on the faces exposed by the sub-setting.
The internalFvsPatchField operates as a 'calculated' type so that the internal
face values are displayed on the faces exposed by the sub-setting.
The immediate benefit of this change can be seen when using 'subsetMesh' without
the '-noFields' option to create and write a sub-set of an 'fvMesh' with field
values, now the face values of the 'exposed' internal faces can be visualised.
the previous naming tan1, tan2, normal was non-intuitive and very confusing.
It was not practical to maintain backward compatibility but all tutorials and
example refineMeshDict files have been updated to provide examples of the
change.
The inside or outside region refinement level is now specified using the simple
"level <level>" entry in refinementRegions e.g.
refinementRegions
{
refinementBox
{
mode inside;
level 5;
}
}
rather than
refinementRegions
{
refinementBox
{
mode inside;
levels ((1E15 5));
}
}
where the spurious "1E15" number is not used and the '((...))' is unnecessary clutter.
to ensure that the contact angle specification is used irrespective of which
phase it is specified in. An error is reported if both phases of the interface
pair have a contact angle specification as the specifications might be
inconsistent.
Resolves bug-report https://bugs.openfoam.org/view.php?id=3688
to ensure that the contact angle specification is used irrespective of which
phase it is specified in. An error is reported if both phases of the interface
pair have a contact angle specification as the specifications might be
inconsistent.
Resolves bug-report https://bugs.openfoam.org/view.php?id=3688
The pressure work term for total internal energy is div(U p) which can be
discretised is various ways, given a mass flux field phi it seems logical to
implement it in the form div(phi/interpolate(rho), p) but this is not exactly
consistent with the relationship between enthalpy and internal energy (h = e +
p/rho) and the transport of enthalpy, it would be more consistent to implement
it in the form div(phi, p/rho). A further improvement in consistency can be
gained by using the same convection scheme for this work term and the convection
term div(phi, e) and for reacting solvers this is easily achieved by using the
multi-variate limiter mvConvection provided for energy and specie convection.
This more consistent total internal energy work term has now been implemented in
all the compressible and reacting flow solvers and provides more accurate
solutions when running with internal energy, particularly for variable density
mixing cases with small pressure variation.
For non-reacting compressible solvers this improvement requires a change to the
corresponding divScheme in fvSchemes:
"div\(alphaPhi.*,p\)" -> "div\(alphaRhoPhi.*,\(p\|thermo:rho.*\)\)"
and all the tutorials have been updated accordingly.
such that the Lewis number is unity with respect to enthalpy even when solving
for internal energy providing more consistent behaviour between the energy
choices.
Differential diffusion of species requires a corresponding term in the enthalpy
equation and the same term in the internal energy equation, not the analogous
term for internal energy as previously implemented. With this correction the
internal energy equation is now consistent with the enthalpy equation.
The pressure work term for total internal energy is div(U p) which can be
discretised is various ways, given a mass flux field phi it seems logical to
implement it in the form div(phi/interpolate(rho), p) but this is not exactly
consistent with the relationship between enthalpy and internal energy (h = e +
p/rho) and the transport of enthalpy, it would be more consistent to implement
it in the form div(phi, p/rho). A further improvement in consistency can be
gained by using the same convection scheme for this work term and the convection
term div(phi, e) and for reacting solvers this is easily achieved by using the
multi-variate limiter mvConvection provided for energy and specie convection.
This more consistent total internal energy work term has now been implemented in
all the compressible and reacting flow solvers and provides more accurate
solutions when running with internal energy, particularly for variable density
mixing cases with small pressure variation.
For non-reacting compressible solvers this improvement requires a change to the
corresponding divScheme in fvSchemes:
div(phiv,p) -> div(phi,(p|rho))
and all the tutorials have been updated accordingly.
Class
Foam::hydrostaticInitialisation
Description
Optional hydrostatic initialisation of p_rgh and p by solving for and
caching the hydrostatic ph_rgh and updating the density such that
p = ph_rgh + rho*gh + pRef
This initialisation process is applied at the beginning of the run (not on
restart) if the \c hydrostaticInitialisation switch is set true in
fvSolution/PIMPLE or fvSolution/SIMPLE. The calculation is iterative if the
density is a function of pressure and an optional number of iterations \c
nHydrostaticCorrectors may be specified which defaults to 5.
Class
Foam::hydrostaticInitialisation
Description
Optional hydrostatic initialisation of p_rgh and p by solving for and
caching the hydrostatic ph_rgh and updating the density such that
p = ph_rgh + rho*gh + pRef
This initialisation process is applied at the beginning of the run (not on
restart) if the \c hydrostaticInitialisation switch is set true in
fvSolution/PIMPLE or fvSolution/SIMPLE. The calculation is iterative if the
density is a function of pressure and an optional number of iterations \c
nHydrostaticCorrectors may be specified which defaults to 5.
