- old convention was that on last time step it would only call end()
and not execute()
- however this meant that e.g. the functionObjectProperties file
did not get written
- and almost all functionObjects were doing an execute() inside of end()
- new convention: call execute() on last time step, just before doing end()
Updated objects
- corrected Peclet number for compressible cases
- propagated log flag and resultName across objects
New function objects
- new fluxSummary:
- calculates positive, negative, absolute and net flux across face
zones
- new runTimeControl
- abort the calculation when a user-defined metric is achieved.
Available options include:
- average value remains unchanged wrt a given threshold
- equation initial residual exceeds a threshold - useful to abort
diverging cases
- equation max iterations exceeds a threshold - useful to abort
diverging cases
- min/max of a function object value
- min time step exceeds a threshold - useful to abort diverging
cases
- new valueAverage:
- average singular values from other function objects, e.g. Cd, Cl and
Cm from the forceCoeffs function object
Properties stored in state dictionary:
- Moment coefficient: Cm
- Drag coefficient: Cd
- Lift coefficient: Cl
- Front lift coefficient: Cl(f)
- Rear lift coefficient: Cl(r)
This had been used in functionObjects:
Info(log)<< "messages" << data << ....
in which it is not at all clear what the "log" argument does whereas
if (log) Info<< "messages" << data << ....
is totally clear and more efficient.
This approach simply accumulates data outside the range of the bins into
the first or last bin which may be OK for small motions. For larger
motions it may be better if the bins are updated or operate in a
coordinate system attached to the body for solid-body motion.
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1560
The old separate incompressible and compressible libraries have been removed.
Most of the commonly used RANS and LES models have been upgraded to the
new framework but there are a few missing which will be added over the
next few days, in particular the realizable k-epsilon model. Some of
the less common incompressible RANS models have been introduced into the
new library instantiated for incompressible flow only. If they prove to
be generally useful they can be templated for compressible and
multiphase application.
The Spalart-Allmaras DDES and IDDES models have been thoroughly
debugged, removing serious errors concerning the use of S rather than
Omega.
The compressible instances of the models have been augmented by a simple
backward-compatible eddyDiffusivity model for thermal transport based on
alphat and alphaEff. This will be replaced with a separate run-time
selectable thermal transport model framework in a few weeks.
For simplicity and ease of maintenance and further development the
turbulent transport and wall modeling is based on nut/nuEff rather than
mut/muEff for compressible models so that all forms of turbulence models
can use the same wall-functions and other BCs.
All turbulence model selection made in the constant/turbulenceProperties
dictionary with RAS and LES as sub-dictionaries rather than in separate
files which added huge complexity for multiphase.
All tutorials have been updated so study the changes and update your own
cases by comparison with similar cases provided.
Sorry for the inconvenience in the break in backward-compatibility but
this update to the turbulence modeling is an essential step in the
future of OpenFOAM to allow more models to be added and maintained for a
wider range of cases and physics. Over the next weeks and months more
turbulence models will be added of single and multiphase flow, more
additional sub-models and further development and testing of existing
models. I hope this brings benefits to all OpenFOAM users.
Henry G. Weller
