fca802fa82
Description
This fvModel applies forcing to the liquid phase-fraction field and all
components of the vector field to relax the fields towards those
calculated from the current wave distribution.
The force coefficient \f$\lambda\f$ should be set based on the desired level
of forcing and the residence time the waves through the forcing zone. For
example, if waves moving at 2 [m/s] are travelling through a forcing zone 8
[m] in length, then the residence time is 4 [s]. If it is deemed necessary
to force for 5 time-scales, then \f$\lambda\f$ should be set to equal 5/(4
[s]) = 1.2 [1/s]. If more aggressive forcing is required adjacent to the
boundaries, which is often the case if wave boundary conditions are
specified at outflow boundaries, the optional \f$\lambdaBoundary\f$
coefficient can be specified higher than the value of \f$\lambda\f$.
Alternatively the forcing force coefficient \f$\lambdaCoeff\f$ can be
specified in which case \f$\lambda\f$ is evaluated by multiplying the
maximum wave speed by \f$\lambdaCoeff\f$ and dividing by the forcing region
length. \f$\lambdaBoundary\f$ is similarly evaluated from
\f$\lambdaBoundaryCoeff\f$ if specified.
Usage
Example usage:
\verbatim
waveForcing1
{
type waveForcing;
libs ("libwaves.so");
liquidPhase water;
// Define the line along which to apply the graduation
origin (600 0 0);
direction (-1 0 0);
// // Or, define multiple lines
// origins ((600 0 0) (600 -300 0) (600 300 0));
// directions ((-1 0 0) (0 1 0) (0 -1 0));
scale
{
type halfCosineRamp;
start 0;
duration 300;
}
lambdaCoeff 2; // Forcing coefficient
// lambdaBoundaryCoeff 10; // Optional boundary forcing coefficient
// Useful when wave BCs are specified at outlets
// Write the forcing fields: forcing:scale, forcing:forceCoeff
writeForceFields true;
}
\endverbatim
57 lines
1.2 KiB
C++
57 lines
1.2 KiB
C++
/*--------------------------------*- C++ -*----------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration | Website: https://openfoam.org
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\\ / A nd | Version: dev
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\\/ M anipulation |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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format ascii;
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class dictionary;
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location "constant";
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object fvModels;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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forcing
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{
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type waveForcing;
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libs ("libwaves.so");
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liquidPhase water;
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origins
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(
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(0 0.75 0.5)
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(0 0.25 0.5)
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(0.25 0 0.5)
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(0.75 0 0.5)
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);
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directions
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(
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( 0 1 0)
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( 0 -1 0)
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(-1 0 0)
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( 1 0 0)
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);
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scale
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{
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type halfCosineRamp;
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start 0;
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duration 0.5;
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}
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lambdaCoeff 2;
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lambdaBoundaryCoeff 10;
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// Write the forcing fields: forcing:scale, forcing:forceCoeff
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writeForceFields true;
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}
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// ************************************************************************* //
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