Corrected the use of the lagged thermal phase change dmdt in interfacial
heat transfer calculations of n-phase simulations
Patch contributed by Juho Peltola, VTT.
To handle the additional optional specification for the closeness calculation
these settings are now is a sub-dictionary of surfaceFeaturesDict, e.g.
closeness
{
// Output the closeness of surface elements to other surface elements.
faceCloseness no;
// Output the closeness of surface points to other surface elements.
pointCloseness yes;
// Optional maximum angle between opposite points considered close
internalAngleTolerance 80;
externalAngleTolerance 80;
}
Description
PTT model for viscoelasticity using the upper-convected time
derivative of the stress tensor with support for multiple modes.
Reference:
\verbatim
Thien, N. P., & Tanner, R. I. (1977).
A new constitutive equation derived from network theory.
Journal of Non-Newtonian Fluid Mechanics, 2(4), 353-365.
\endverbatim
Currently the common exponential form of the PTT model is provided but it could
easily be extended to also support the linear and quadratic forms if the need
arises.
rhoPimpleFoam now produces identical results to rhoSimpleFoam when run
with a steady-state time-scheme. The intention is that this solver can
now be used as a reference when adding steady-state support to other
compressible solvers for which no SIMPLE variant exists.
rhoReactingFoam has also been updated to support SIMPLE operation, as it
shares a pressure equation with rhoPimpleFoam.
to splice the SlicedGeometricField into a complete contiguous Field.
e.g. to splice the flux field phi:
scalarField completePhi
(
slicedSurfaceScalarField
(
IOobject
(
"slicedPhi",
runTime.timeName(),
mesh
),
phi,
false
).splice()
);
ThermalPhaseChangePhaseSystem enables phase change for phase pairs that
have saturationModels. This change makes alphatWallBoilingWallFunction
work in the same way; i.e., it disables evalulation of the wall boiling
models if a saturation model is not found.
Patch contributed by Juho Peltola, VTT.
The hRefConst and eRefConst thermos that were local to
reacting*EulerFoam have been removed and the reference state that they
used has been incorporated into the standard hConst and eConst thermos.
The hConst thermo model now evaluates the enthalpy like so:
Ha = Hf + Hs
= Hf + Cp*(T - Tref) + Hsref (+ equation of state terms)
Where Ha is absolute enthalpy, Hs is sensible enthalpy, Cp is specific
heat at constant pressure, T is temperature, Tref is a reference
temperature and Hsref is a reference sensible enthalpy. Hf, Cp, Tref and
Hsref are user inputs. Of these, Tref and Hsref are new. An example
specification is as follows:
thermodynamics
{
Hf -1.34229e+07;
Cp 2078.4;
Tref 372.76;
Hsref 128652;
}
The ref quantities allows the user to specify a state around which to
linearise the relationship between temperature and enthalpy. This is
useful if the temperature range of the simulation is small enough to
consider the relationship linear, but linearity does not hold all the
way to standard conditions.
To maintain backwards compatibility, Tref defaults to standard
temperature, and Hsref defaults to zero, so a case using hConst thermo
requires no modification as a result of this change.
The only change to the default operation is that to calculate sensible
enthalpy Cp is multiplied by the difference between the current
temperature and the standard temperature, whether as previously Cp was
multiplied by the current temperature only. This means that at standard
conditions sensible enthalpy is now zero, and absolute enthalpy equals
the formation enthalpy. This is more consistent with the definitions of
the various enthalpies, and with other thermo models such as janaf. This
change should only affect reacting cases that use constant thermo
models.
The ThermalPhaseChangePhaseSystem stores the thermal phase change dmdt
used in the previous continuity error update and uses that to stabilize
the interfacial heat transfer calculations when phase fractions approach
zero.
Patch contributed by Juho Peltola, VTT.
continuityError is now just the transport inconsistency. Mass sources,
whether as a result of fvOptions or phase-transfer/change processes, are
not included.
Updated the continuity error compensation term in the face momentum formulation
so that separate flow and source continuity errors are combined into a single
term.
This case is an updated version of
tutorials/multiphase/multiphaseEulerFoam/damBreak4phase using the latest models
available in reactingMultiphaseEulerFoam for interface capturing.
The utilised static parts of polyMeshGeometry are now part of a
polyMeshCheck namespace. Everything else has been removed, as they were
unused, out of date, and/or duplicated elsewhere.
In multiphase systems it is only necessary to solve for all but one of the
moving phases. The new referencePhase option allows the user to specify which
of the moving phases should not be solved, e.g. in constant/phaseProperties of the
tutorials/multiphase/reactingMultiphaseEulerFoam/RAS/fluidisedBed tutorial case with
phases (particles air);
referencePhase air;
the particles phase is solved for and the air phase fraction and fluxes obtained
from the particles phase which provides equivalent behaviour to
reactingTwoPhaseEulerFoam and is more efficient than solving for both phases.
combining the multiphaseCompressibleTurbulenceModels and derivedFvPatchFields
libraries with the generic multiphase turbulence models from the
twoPhaseCompressibleTurbulenceModels library, kineticTheoryModels and
phasePressureModel into a single common library compiled and linked into both
reactingTwoPhaseEulerFoam and reactingMultiphaseEulerFoam.
