This is faster than the library functionality that it replaces, as it
allows the compiler to do inlining. It also does not utilise any static
state so generators do not interfere with each other. It is also faster
than the the array lookup in cachedRandom. The cachedRandom class
therefore offers no advantage over Random and has been removed.
Tree bound boxes are expanded asymmetrically to reduce the liklihood of
octree faces aliging with mesh faces and edges. The asymmetry is now
generated using hard-coded irrational numbers, rather than using a
random generator.
The asymmetry was effectively already hard coded. The random numbers are
only pseudo random, so the same numbers were being applied to the bound
boxes every time. This change simply removes the overhead of creating
the generator, and also gets rid of some duplicated code.
Sometimes decomposition can remove a cyclic patch entirely, converting
it into a processor cyclic. If this patch is being used to specify the
transform for a cyclicRepeatAMI patch then the calculation will fail.
This change adds a check for this situation, and errors with the
suggestion that the transform patch be preserved during decomposition.
The use of random numbers for positioning within the cone injection
models has been made consistent across all cores. Some calls have been
synchronised by means of the globalSample methods, whilst others have
been replaced by non-randomised algorithms.
This resolves bug report https://bugs.openfoam.org/view.php?id=2956
The functions findMin and findMax return the index of the minimum or
maximum component, consistently with the functions in ListOps.H. The
perpendicular function returns an arbitrary vector perpendicular to the
supplied vector, with the same magnitude.
MultiInteraction appeared to have been written for combining the usual
patch interaction models with a model called
CoincidentBaffleInteraction, which was never released. None of the
remaining patch interaction models make sense operating in combination,
so the MultiInteraction model has been removed. All documentation
references to CoincidentBaffleInteraction have also been deleted.
Resolves bug report https://bugs.openfoam.org/view.php?id=2939
This prevents infinite loops occurring during correction steps as a
result of a fixed correction velocity repeatedly pushing the particle
towards a rebound patch.
Resolves bug report https://bugs.openfoam.org/view.php?id=2935
This is equivalent to track to face, but it additionally crosses
internal faces at the end of the track to move into the next cell. This
is a common procedure when performing post-processing tracking
operations.
The new "rigid" joint permits no motion at all, "function" specifies the
position of the joint as a function of the position of it's parent, and
"functionDot" specifies the position of the joint as a function of the
velocity of it's parent. Note that the functions are applied uniformly
to each component of the parent joint's position/motion. Example
specifications are shown below.
joint
{
type rigid;
}
joint
{
type function;
function table ((-1 0) (0 1) (1 0));
}
joint
{
type functionDot;
function table ((-1 0) (0 1) (1 0));
}
This work was supported by Caitlin Worden Hodge, at Zyba
This allows for fixed joints or joints which completely constrain the
motion as a function of some other aspect of the model. The latter has
also been facilitaed by adding a reference to the rigid body model to
the base joint class.
Now lnInclude are created as required by the presence of entries in the EXE_INC
variable in the Make/options file. This removes the need for calling
wmakeLnInclude in various Allwmake files to ensure the existence of the
lnInclude directories prior to compilation of dependent libraries.
Requires the following changes to the corresponding entry in the fvOptions dictionary:
i. Use Tsol instead Tmelt as previously to define melting temperature in
isothermal phase change (for pure substance or eutectic mixture -> Tsol = Tliq);
ii. Optionally define new Tliq > Tsol to consider liquidus temperature in
non-isothermal phase change (for miscible mixture), where previous
defined Tsol defines solidus temperature;
iii. optionally define also alpha1e to consider max eutectic melt
fraction (that should be the percentage of solvent phase changed from
initial to eutectic liquid concentration) in partially isothermal (at
Tsol=Teutectic) and non-isothermal (from Tsol=Teutectic to Tliq) phase
change (for solid not miscible mixture) (alpha1e=0 -> pure substance;
alpha1e=1 -> eutectic mixture that is strictely not permitted).
Description
This source is designed to model the effect of solidification and melting
processes, e.g. windhield defrosting.
The isotherm phase change occurs at the melting temperature, \c Tsol (= \c
Tliq). The not isotherm phase change occurs between solidus and liquidus
temperature, \c Tsol < \c Tliq respectively, as long as the melt fraction is
greater than the max eutectic melt fraction, \c alpha1e (0 =
pure_substance, 1 = eutectic_mixture is not permitted) , i.e. eutectic to
initial solvent concentration difference, where a linear eutectic melt
fraction to temperature relation is considered - lever rule.
The presence of the solid phase in the flow field is incorporated into the
model as a momentum porosity contribution; the energy associated with the
phase change is added as an enthalpy contribution.
References:
\verbatim
Voller, V. R., & Prakash, C. (1987).
A fixed grid numerical modelling methodology for convection-diffusion
mushy region phase-change problems.
International Journal of Heat and Mass Transfer, 30(8), 1709-1719.
Swaminathan, C. R., & Voller, V. R. (1992).
A general enthalpy method for modeling solidification processes.
Metallurgical transactions B, 23(5), 651-664.
\endverbatim
The model generates the field \c \<name\>:alpha1 which can be visualised to
to show the melt distribution as a fraction [0-1].
Usage
Example usage:
\verbatim
solidificationMeltingSource1
{
type solidificationMeltingSource;
active yes;
selectionMode cellZone;
cellZone iceZone;
Tsol 273;
L 334000;
thermoMode thermo;
beta 50e-6;
rhoRef 800;
}
\endverbatim
Where:
\table
Property | Description | Required | Default value
Tsol | Solidus temperature [K] | yes |
Tliq | Liquidus temperature [K] | no | Tsol
alpha1e | Max eutectic melt fraction [0-1[ | no | 0
L | Latent heat of fusion [J/kg] | yes |
relax | Relaxation coefficient [0-1] | no | 0.9
thermoMode | Thermo mode [thermo|lookup] | yes |
rhoRef | Reference (solid) density [kg/m^3] | yes |
rho | Name of density field | no | rho
T | Name of temperature field | no | T
Cp | Name of specific heat field | no | Cp
U | Name of velocity field | no | U
phi | Name of flux field | no | phi
Cu | Model coefficient [1/s] | no | 100000
q | Model coefficient | no | 0.001
beta | Thermal expansion coefficient [1/K] | yes |
g | Accelerartion due to gravity | no |
\endtable
Patch contributed by Lorenzo Trevisan and integrated by CFD Direct.
Resolves patch request https://bugs.openfoam.org/view.php?id=2907
