See http://www.openfoam.org/mantisbt/view.php?id=2076
- .org is the file extension for emacs org-mode as well
- .orig is more to the point (.org isn't always recognized as "original")
- .original is too long, although more consistent with the convention
of source code file naming
Update script contributed by Bruno Santos
This condition creates a zero-dimensional model of an enclosed volume of
gas upstream of the inlet. The pressure that the boundary condition
exerts on the inlet boundary is dependent on the thermodynamic state of
the upstream volume. The upstream plenum density and temperature are
time-stepped along with the rest of the simulation, and momentum is
neglected. The plenum is supplied with a user specified mass flow and
temperature.
The result is a boundary condition which blends between a pressure inlet
condition condition and a fixed mass flow. The smaller the plenum
volume, the quicker the pressure responds to a deviation from the supply
mass flow, and the closer the model approximates a fixed mass flow. As
the plenum size increases, the model becomes more similar to a specified
pressure.
The expansion from the plenum to the inlet boundary is controlled by an
area ratio and a discharge coefficient. The area ratio can be used to
represent further acceleration between a sub-grid blockage such as fins.
The discharge coefficient represents a fractional deviation from an
ideal expansion process.
This condition is useful for simulating unsteady internal flow problems
for which both a mass flow boundary is unrealistic, and a pressure
boundary is susceptible to flow reversal. It was developed for use in
simulating confined combustion.
tutorials/compressible/rhoPimpleFoam/laminar/helmholtzResonance:
helmholtz resonance tutorial case for plenum pressure boundary
This development was contributed by Will Bainbridge
Also added the new prghTotalHydrostaticPressure p_rgh BC which uses the
hydrostatic pressure field as the reference state for the far-field
which provides much more accurate entrainment is large open domains
typical of many fire simulations.
The hydrostatic field solution is controlled by the optional entries in
the fvSolution.PIMPLE dictionary, e.g.
hydrostaticInitialization yes;
nHydrostaticCorrectors 5;
and the solver must also be specified for the hydrostatic p_rgh field
ph_rgh e.g.
ph_rgh
{
$p_rgh;
}
Suitable boundary conditions for ph_rgh cannot always be derived from
those for p_rgh and so the ph_rgh is read to provide them.
To avoid accuracy issues with IO, restart and post-processing the p_rgh
and ph_rgh the option to specify a suitable reference pressure is
provided via the optional pRef file in the constant directory, e.g.
dimensions [1 -1 -2 0 0 0 0];
value 101325;
which is used in the relationship between p_rgh and p:
p = p_rgh + rho*gh + pRef;
Note that if pRef is specified all pressure BC specifications in the
p_rgh and ph_rgh files are relative to the reference to avoid round-off
errors.
For examples of suitable BCs for p_rgh and ph_rgh for a range of
fireFoam cases please study the tutorials in
tutorials/combustion/fireFoam/les which have all been updated.
Henry G. Weller
CFD Direct Ltd.
Patch contributed by Juho Peltola, VTT
The new JohnsonJacksonSchaefferFrictionalStress model is included and
the LBend tutorial case to demonstrate the need for the changes to the
frictional stress models.
Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=2058
e.g. (fvc::interpolate(HbyA) & mesh.Sf()) -> fvc::flux(HbyA)
This removes the need to create an intermediate face-vector field when
computing fluxes which is more efficient, reduces the peak storage and
improved cache coherency in addition to providing a simpler and cleaner
API.
- value corresponds to the max memory when the corresponding profiling
is started.
Only used when the top-level profiling has memInfo active.
- memInfo is disabled by default, since the new maxMem functionality
otherwise adds overhead with every call.
tutorial:
/lagrangian/reactingParcelFoam/verticalChannelLTS
BUG: cyclicACMI: make conservative and remove faceAreas0
Need to review cyclicACMI patch non-overlap values
- values here preserve initial values only
- snGrad - used?
- wall functions - no longer call updateCoeffs with ACMI weights (?)
See merge request !46
Feature mppic inter foam
New MPPICInterFoam solver. Add MPPIC cloud to a VOF approach. Particles volume are considered into transport Eq fluxes.
Solves for 2 incompressible, isothermal immiscible fluids using a VOF
(volume of fluid) phase-fraction based interface capturing approach.
The momentum and other fluid properties are of the "mixture" and a single
momentum equation is solved.
Solver:
/applications/solvers/multiphase/MPPICInterFoam
Tutorial:
/tutorials/multiphase/MPPICInterFoam/twoPhasePachuka
See merge request !41
ENH: Adding interCondensingEvaporatingFoam and tutorial
Solver for 2 incompressible, isothermal immiscible fluids using a VOF
(volume of fluid) phase-fraction based interface capturing approach.
The momentum and other fluid properties are of the "mixture" and a single
momentum equation is solved.
Solver:
/applications/solvers/multiphase/interCondensingEvaporatingFoam
Tutorial:
/tutorials/multiphase/interCondensingEvaporatingFoam/condensatingVessel
See merge request !43
