PVReaders now support compilation against ParaView version 5.7.0 and
greater. All references to ParaView versions less than 4.0.0 have been
removed.
Based on a patch contributed by CFD Support
These function map to the corresponding functions in the
PhaseThermophysicalTransportModel to allow run-time selection and extensibility
of the phase thermophysical transport.
Provides an abstraction of specie transport to support run-times selectable and
extensible multi-component thermal and specie laminar and turbulent transport.
providing the shear-stress term in the momentum equation for incompressible and
compressible Newtonian, non-Newtonian and visco-elastic laminar flow as well as
Reynolds averaged and large-eddy simulation of turbulent flow.
The general deviatoric shear-stress term provided by the MomentumTransportModels
library is named divDevTau for compressible flow and divDevSigma (sigma =
tau/rho) for incompressible flow, the spherical part of the shear-stress is
assumed to be either included in the pressure or handled separately. The
corresponding stress function sigma is also provided which in the case of
Reynolds stress closure returns the effective Reynolds stress (including the
laminar contribution) or for other Reynolds averaged or large-eddy turbulence
closures returns the modelled Reynolds stress or sub-grid stress respectively.
For visco-elastic flow the sigma function returns the effective total stress
including the visco-elastic and Newtonian contributions.
For thermal flow the heat-flux generated by thermal diffusion is now handled by
the separate ThermophysicalTransportModels library allowing independent run-time
selection of the heat-flux model.
During the development of the MomentumTransportModels library significant effort
has been put into rationalising the components and supporting libraries,
removing redundant code, updating names to provide a more logical, consistent
and extensible interface and aid further development and maintenance. All
solvers and tutorials have been updated correspondingly and backward
compatibility of the input dictionaries provided.
Henry G. Weller
CFD Direct Ltd.
This provides an extensible and run-time selectable framework to support complex
energy and specie transport models, in particular multi-component diffusion.
Currently only the Fourier for laminar and eddyDiffusivity for RAS and LES
turbulent flows are provided but the interface is general and the set of models
will be expanded in the near future.
The simplistic energy transport support in compressibleTurbulenceModels has been
abstracted and separated into the new ThermophysicalTransportModels library in
order to provide a more general interface to support complex energy and specie
transport models, in particular multi-component diffusion. Currently only the
Fourier for laminar and eddyDiffusivity for RAS and LES turbulent flows are
provided but the interface is general and the set of models will be expanded in
the near future.
The ThermalDiffusivity and EddyDiffusivity modelling layers remain in
compressibleTurbulenceModels but will be removed shortly and the alphat boundary
conditions will be moved to ThermophysicalTransportModels.
Following the generalisation of the TurbulenceModels library to support
non-Newtonian laminar flow including visco-elasticity and extensible to other
form of non-Newtonian behaviour the name TurbulenceModels is misleading and does
not properly represent how general the OpenFOAM solvers now are. The
TurbulenceModels now provides an interface to momentum transport modelling in
general and the plan is to rename it MomentumTransportModels and in preparation
for this the turbulenceProperties dictionary has been renamed momentumTransport
to properly reflect its new more general purpose.
The old turbulenceProperties name is supported for backward-compatibility.
The ability to specify the file name of the turbulenceProperties dictionary
during construction was added to support multi-phases but now that the handling
of the phase name extension has been completely rationalised and standardised
this complexity and code clutter is no longer used, needed or appropriate.
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.
