Source-point-to-target-triangle projections might be done in order to
determine the location outside of the target triangle, as well as the
location inside. Forcing the source point inside the target triangle is
therefore only appropriate when constructing the intersection geometry.
This has required switching the order of dependence of the fvMesh
geometry (i.e., Sf, Cf, and C), and the interpolation weights. The
weights are now considered dependent on the geometry fields, and the
geometry fields must therefore construct without reference to the
weights.
This calculation more carefully constructs the direction of the area
stabilisation so as to ensure that it does not oppose the area being
stabilised. This prevents the creation of faces with zero area.
Resolves bug report https://bugs.openfoam.org/view.php?id=4040
Omega lower limit bounding is now based on a maximum turbulence viscosity nut
rather than a minimum omega value which improves stability and robustness of
the k-omega models in case of numerical boundedness problems.
The maximum nut value is calculated by multiplying the laminar viscosity by
nutMaxCoeff which defaults to 1e5 but can be set by the user in the
momentumTransport dictionary.
Epsilon lower limit bounding is now based on a maximum turbulence viscosity nut
rather than a minimum epsilon value which improves stability and robustness of
the k-epsilon models in case of numerical boundedness problems.
The maximum nut value is calculated by multiplying the laminar viscosity by
nutMaxCoeff which defaults to 1e5 but can be set by the user in the
momentumTransport dictionary.
The boundary condition applied to pressure at open boundaries and outlets is switched
from totalPressure to entrainmentPressure. The latter boundary condition is more robust
since it calculates the pressure for inflow using (velocity) fluxes rather than velocity
on the patch.
This function has been changed to volume average, making it appropriate
to use on layered meshes in which the cells have non-uniform geometry
within their layers. A 'weightFields' (or 'weightField') control has
also been added, so that mass or phase weighted averages can be
performed within the layers.
These conditions are legacy and should not be considered for general
use. They require specific, unintuitive mesh structuring (i.e.,
duplicated boundary faces) that only PDRMesh can now create.
If an an interface is needed which opens or closes based on modelling
criteria, then this should be implemented as an extension of NCC. That
would be more flexible, parallelisable, and would not require
modification of the underlying polyheral mesh.
This simple model generates a phase change between two phases calculated
from the following expression:
\dot{m}/V = C \alpha \grad \alpha
Where:
\dot{m}/V | mass transfer rate per unit volume
C | coefficient
\alpha | volume fraction of the source phase
Example usage:
coefficientPhaseChange
{
type coefficientPhaseChange;
phases (liquid vapour);
C [kg/m^2/s] 0.1;
}
This model may be of use in simple situations, but it is primarily
designed to serve as a prototype for more complex and physical
mechanisms of phase changes.
An enumeration has been added to the arguments of the allocation
coefficient function, eta, to allow specification of how to allocate out
of bounds of the population balance size-groups. There are two options:
- "Clamp" will create an out-of-bounds allocation coefficient of exactly
one. This partitions unity across all size-space.
- "Extrapolate" will create an out-of-bounds allocation coefficient in
proportion to the ratio between the given size and the nearest
size-group size. This does not partition unity outside the range of
the size-groups.
The previous operation is equivalent to "Extrapolate".
It is not yet clear which method is preferable and under what
circumstances. More testing is required. The enumeration has been
created to facilitate this testing.
This prevents spurious factors of 1000 from being introduced in
thermodynamic models. It also generalises the system further with
respect to alternative unit sets.
The legacy fvMeshTopoChangersMovingCone removed, replaced by the more general
mesh mapping approach, see tutorials incompressibleFluid/movingCone and
shockFluid/movingCone.
