All wall functions now operate collaboratively, obtaining the Cmu, kappa and E
coefficients and yPlusLam from the nutWallFunction base class. Now these
optional inputs need only be specified in the nut boundary condition with the k,
epsilon, omega, v2 and f wall functions obtaining these values from there. This
is much simpler to specify and avoids inconsistencies in the operation of the
wall functions for the different turbulence fields.
The code has also been rationalised and simplified avoiding unnecessary code
and duplication.
Currently these deleted function declarations are still in the private section
of the class declarations but will be moved by hand to the public section over
time as this is too complex to automate reliably.
Replaced all uses of complex Xfer class with C++11 "move" constructors and
assignment operators. Removed the now redundant Xfer class.
This substantial changes improves consistency between OpenFOAM and the C++11 STL
containers and algorithms, reduces memory allocation and copy overhead when
returning containers from functions and simplifies maintenance of the core
libraries significantly.
Implementation of the Giesekus model for visco-elasticity, derived from the new
generalised form of the Maxwell model which now support additional sources.
Giesekus, H., 1982.
A simple constitutive equation for polymer fluids based on the
concept of deformation-dependent tensional mobility.
J. Non-Newton. Fluid. 11, 69–109.
This implementation is instantiated for incompressible, compressible and VoF
two-phase flow.
This switch should be on for phi-correction within the time loop, where
the correction simply serves to keep the phi-field up to date before the
U-equation is solved. It should be off for initialisation
phi-correction, as the necessary data to update the conditions may not
yet exist.
Resolves bug report https://bugs.openfoam.org/view.php?id=3198
The writeEntry form is now defined and used consistently throughout OpenFOAM
making it easier to use and extend, particularly to support binary IO of complex
dictionary entries.
The sub-loops of the solution control are now named more consistently,
with ambiguously named methods such as finalIter replaced with ones
like finalPimpleIter, so that it is clear which loop they represent.
In addition, the final logic has been improved so that it restores state
after a sub-iteration, and so that sub-iterations can be used on their
own without an outer iteration in effect. Previously, if the
non-orthogonal loop were used outside of a pimple/piso iteration, the
final iteration would not execute with final settings.
The advantage of using this constructor for user-input dimensioned model
parameters is that it handles a variety of input; from just the value to
the full name-dimensions-value set. As more is specified, more is
checked.
Some other minor formatting improvements to the reactingEulerFoam
sub-modeling libraries have also been made.
Patch contributed by Institute of Fluid Dynamics,
Helmholtz-Zentrum Dresden - Rossendorf (HZDR)
The keyword which selects how the subset over which the function
operates is generated has been renamed to "selectionMode", to make it
more consistent with other parts of the OpenFOAM (e.g., fvOptions). It
can still take the value "all" or "cellZone". A cell zone is now
specified with a "cellZone", again for consistency.
Error messaging has also been overhauled.
Patch contributed by Institute of Fluid Dynamics,
Helmholtz-Zentrum Dresden - Rossendorf (HZDR)
Added the breakup and coalescence models of Lehr et al. (2002), and the
coalescence model of Luo (1993).
Patch contributed by Institute of Fluid Dynamics,
Helmholtz-Zentrum Dresden - Rossendorf (HZDR)
Prior to this commit, the drift term implementation was invalid for a
ratio x_{i+1}/x_i >= 2 between the characteristic volumes of two
subsequent size groups.
Patch contributed by Institute of Fluid Dynamics,
Helmholtz-Zentrum Dresden - Rossendorf (HZDR)
References:
Luo, H., & Svendsen, H. F. (1996).
Theoretical model for drop and bubble breakup in turbulent dispersions.
AIChE Journal, 42(5), 1225-1233.
Eq. 27, p. 1229.
Bannari, R., Kerdouss, F., Selma, B., Bannari, A., & Proulx, P. (2008).
Three-dimensional mathematical modeling of dispersed two-phase flow
using class method of population balance in bubble columns.
Computers & chemical engineering, 32(12), 3224-3237.
Eq. 49, p. 3230.
Patch contributed by Institute of Fluid Dynamics, Helmholtz-Zentrum
Dresden - Rossendorf (HZDR)
The new patch field mapping class timeVaryingMappedFvPatchField has been
factored out of the timeVaryingMappedFixedValueFvPatchField BC so that it can be
used to map data onto fields stored within other BCs.
In the process the writeEntryIfDifferent function had to be moved from
fvPatchField to dictionary so that it can still be used in the
timeVaryingMappedFvPatchField class and it made good sense to create the
non-conditional variant writeEntry to simplify the patch field write functions.
This rationalisation has been propagated all other patch fields.
A number of improvements have been made to the population balance phase
change drift model.
- The model now checks the ordering of the phase pairs and changes the
sign of the drift rate accordingly.
- The phase change mass flux and weights are calculated for each
velocity group, so the drift rate and phase change mass flux should be
consistent for each velocity group.
- By default the phase change mass flux is distributed between the size
groups based on the interfacial area of each group. For backward
compatibility number weighting can be enabled with a new
"numberWeighted" option.
The model now requires the user to provide a list of phase pairs in the
usual parenthesised form, rather than using the name. For example:
phaseChange
{
pairs ((gas and liquid));
}
Patch contributed by Juho Peltola, VTT.
The stabilisation term for the heat transfer with the interface
temperature has been changed to mirror the local heat transfer in the
phase, rather than an effective heat transfer across both phases. This
makes the stabilisation term match the actual temperature-based transfer
terms more accurately. The difference is particularly significant when
the mass transfer rate is high, and cases of this type gain a
significant stability benefit from this change as a result.
Patch contributed by Juho Peltola, VTT.
Latent heat is now evaluated at Tsat instead of Tf for the thermal phase
change method. This provides a smooth transition of the interface
temperature field as the phase fraction tends to zero.
Patch contributed by Juho Peltola, VTT.
The phase which the function object relates to is now selected with the
keyword "phase", rather than "phaseName". This is consistent with other
name entries such as the "phi" entry for an inletOutlet boundary.
This is a heat transfer model with a constant fixed value for the
Nusselt number. It requires a single "Nu" entry to be specified.
Patch contributed by Juho Peltola, VTT
This had been removed by commit e1c95941, as most of the time it was
only being used to control writing of the diameter field. IATE does
require it, however, so it has been reinstated for that model.
Registration occurs when the temporary field is transferred to a non-temporary
field via a constructor or if explicitly transferred to the database via the
regIOobject "store" methods.
The energy transfer associated with phase change has been corrected in
the case that the variable being solved for is internal energy.
Patch contributed by Juho Peltola, VTT.
The selection of the "Final" solver settings is now handled automatically within
the "<equation>.solve()" call and there is no longer any need no provide a bool
argument for specific cases. This simplifies the solution algorithm loop
structures and ensures consistency in behaviour across all solvers.
All tutorials have been updated to correspond to the now consistent rules.
Now for transient simulations "Final" solver settings are required for ALL
equations providing consistency between the solution of velocity, energy,
composition and radiation properties.
However "Final" relaxation factors are no longer required for fields or
equations and if not present the standard value for the variable will be
applied. Given that relaxation factors other than 1 are rarely required for
transient runs and hence the same for all iterations including the final one
this approach provide simpler input while still providing the flexibility to
specify a different value for the final iteration if required. For steady cases
it is usual to execute just 1 outer iteration per time-step for which the
standard relaxation factors are appropriate, and if more than one iteration is
executed it is common to use the same factors for both. In the unlikely event
of requiring different relaxation factors for the final iteration this is still
possible to specify via the now optional "Final" specification.
This can be used to speedup simulations that converge to a steady state
by only updating the source terms once every few iterations. The number
of iterations between each update is set in fvSolution as follows:
solvers
{
bubbles
{
sourceUpdateInterval 10;
}
// etc ...
}
By default the interval is 1, and so the sources update every time.
Based on a patch contributed by Juho Peltola, VTT.
Commit 674bff40 was in the right direction, but pressure dependence also
has to be corrected for, whether the phase is pure or not. The phase now
always updates the thermo whilst maintaining a constant temperature.
An isothermal phase still needs to trigger a thermo update in it's base
classes, primarily to ensure that any inert species fractions get
updated. This will not trigger an actual update of the thermodynamics,
as that is done in AnisothermalPhaseModel.
This is a model for the diameter of vapour bubbles. It calculates the
diameter as a linear function of the liquid sub-cooling.
Also removed the correct method from diameterModel, as it wasn't really
doing anything except facilitating the update of diameter fields to be
written out. Derived sub-models can control this locally without
polluting the base interface.
Based on patch contributed by by Juho Peltola, VTT.
