OpenFOAM® v1912: New boundary conditions
23/12/2019
New wave modelling
This release extends the waveMaker condition introduced in OpenFOAM v1812 to generate 3-D waves by selecting the number of paddles. An example of a 3-D flap wave generator is shown below.
- Source code
- $FOAM_SRC/waveModels/derivedPointPatchFields/waveMaker
- Examples
- $FOAM_TUTORIALS/multiphase/interFoam/laminar/waves/waveMakerMultiPaddleFlap
$FOAM_TUTORIALS/multiphase/interFoam/laminar/waves/waveMakerMultiPaddlePiston - Attribution
- These extensions were supplied by the Environmental Hydraulics Institute IHCantabria - see commit d0c5662172 Authors: Gabriel Barajas
- Integration
- The code has been integrated by OpenCFD - see merge request 317
New expressions-based boundary conditions
Where expressions meet boundary conditions: the exprFixedValue and exprMixed boundary conditions.
These boundary conditions support values, gradient and fraction as expressions. For example,
outlet1
{
type exprFixedValue;
value $internalField;
valueExpr "0.5*(pInlet + pOutlet2)";
variables
(
"pInletinlet = weightAverage(p)"
"pOutlet2outlet2 = p"
);
}
{
type exprFixedValue;
value $internalField;
valueExpr "0.5*(pInlet + pOutlet2)";
variables
(
"pInletinlet = weightAverage(p)"
"pOutlet2outlet2 = p"
);
}
New scaled boundary condition wrapper
This is a wrapper to add time- or space-varying scaling to any (fixed value) boundary condition without any coding. It adds all the functionality of uniformFixedValue - see here. In the example below it modifies a standard fixedValue boundary condition, specified using the patch entry, to apply a scale according to the scale entry, to ramp from 0 (at time 0) to 1 (at time 1 and maintained to time 100).
<patchName>
{
type scaledFixedValue;
scale table
(
( 0 0)
( 1.0 1.0)
(100.0 1.0)
);
patch
{
type fixedValue;
value uniform (15 0 0);
}
}
{
type scaledFixedValue;
scale table
(
( 0 0)
( 1.0 1.0)
(100.0 1.0)
);
patch
{
type fixedValue;
value uniform (15 0 0);
}
}
The scale entry is a PatchFunction1 that has multiple options, including:
- constant
- csvFile
- mappedFile
- polynomial
- sampled
- scale
- sine
- square
- table
- tableFile
- uniformValue