With waveForcing waves can be generated with a domain by applying forcing to
both the phase-fraction and velocity fields rather than requiring that the waves
are introduced at an inlet. This provides much greater flexibility as waves can
be generated in any direction relative to the mean flow, obliquely or even
against the flow. isotropicDamping or verticalDamping can be used in
conjunction with waveForcing to damp the waves before they reach an outlet,
alternatively waveForcing can be used in regions surrounding a hull for example
to maintain far-field waves everywhere.
The tutorials/multiphase/interFoam/laminar/forcedWave tutorial case is provided
to demonstrate the waveForcing fvModel as an alternative to the wave inlet
boundary conditions used in the tutorials/multiphase/interFoam/laminar/wave
case.
Class
Foam::fv::waveForcing
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 forcing 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].
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;
}
lambda 0.5; // Forcing coefficient
}
\endverbatim
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