By default the prefix is no longer added to the field names but the previous
behaviour can be reproduced by setting the optional "prefix" entry to "on" or
"yes".
to avoid the need to evaluate departure functions and simplify evaluation of the
temperature. In general it makes more sense to use and e/Cv based
thermodynamics when solving for internal energy rather than h/Cp and have
convert between the energy forms.
All related tutorials and test cases have also been updated.
Changed liquid thermo from sensibleEnthalpy to sensibleInternalEnergy in
tutorials. It is generally more convergent and stable to solve for internal
energy if the fluid is incompressible or weakly compressible.
Zeroing a dimensioned field can now be achieved by assignment to the
zero type. This prevents the clutter associated with constructing an
appropriate dimensioned type, or having to use multiply-equals-zero as a
workaround.
The phaseForces function object now only calulates and writes out forces
when the corresponding model exists.
Patch contributed by Institute of Fluid Dynamics, Helmholtz-Zentrum
Dresden - Rossendorf (HZDR)
Changed to using of UPtrList<Type> instead of List<*Type> for storing
reference to size and velocity groups, as this removes de-referencing
clutter. Fixed lookup of critical film thickness in PrinceBlanch
coalescence model. Added functionality calculating the overall diameter,
void fraction and void fraction weighted velocity for multiple velocity
groups.
Patch contributed by Institute of Fluid Dynamics, Helmholtz-Zentrum
Dresden - Rossendorf (HZDR)
This interpolation method was previously removed by commit fbf00209.
The intention of this method is to provide a slip-like wall boundary
condition for the velocity when interpolated to the location of a
Lagrangian element. This is difficult because any velocity which points
through the wall can cause a drag model and a rebound wall interaction
to "fight"; i.e., the drag pushes the particle to the wall, the wall
bounces it back. This can result in the program hanging.
This method extrapolates a vector field to the wall points and then
modifies the result so that it does not point through the wall. It does
this by rotating the vectors towards the (reversed) point normal. The
result is also scaled so that is reduced to zero if the necessary
rotation exceeds 90 degrees.
This provides an alternate resolution to bug report
https://bugs.openfoam.org/view.php?id=2826
Within this structure the BirdCarreau, Casson, CrossPowerLaw, HerschelBulkley,
powerLaw and strainRateFunction strain-dependent viscosity based non-Newtonian
fluid models may be selected for incompressible or compressible flow.
In the case of compressible flow the strain-dependent viscosity functions are
applied to the temperature dependent viscosity so that if the WLF viscosity
model is chosen in conjunction with the CrossPowerLaw the effective model is
Cross-WLF which is commonly used for polymer flow.
These models are selected in the constant/turbulenceProperties file, e.g.
simulationType laminar;
laminar
{
laminarModel generalizedNewtonian;
viscosityModel CrossPowerLaw;
nuInf 10;
m 0.4;
n 3;
}
This new implementation is more general and flexible than the previous
incompressible only non-Newtonian viscosity models, which were selected in the
constant/transportProperties file. This implementation is now deprecated and
will be phased-out.
Description
Transport package using the Williams-Landel-Ferry model.
Templated into a given thermodynamics package (needed for thermal
conductivity).
Dynamic viscosity [kg/m.s]
\f[
\mu = \mu_0 \exp \left(\frac{-C_1 ( T - T_r )}{C_2 + T - T_r}\right)
\f]
References:
\verbatim
Williams, M. L., Landel, R. F., & Ferry, J. D. (1955).
The temperature dependence of relaxation mechanisms
in amorphous polymers and other glass-forming liquids.
Journal of the American Chemical society, 77(14), 3701-3707.
\endverbatim
