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ENH: streamline : added subcycling

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This commit is contained in:
mattijs
2010-10-26 18:42:36 +01:00
parent 281f06df04
commit 1525e24b37
6 changed files with 95 additions and 29 deletions
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76
src/postProcessing/functionObjects/field/streamLine/streamLineParticle.C
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@ -36,6 +36,24 @@ namespace Foam
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
// Estimate dt to cross cell in a few steps
Foam::scalar Foam::streamLineParticle::calcSubCycleDeltaT
(
streamLineParticle::trackData& td,
const scalar dt,
const vector& U
) const
{
streamLineParticle testParticle(*this);
bool oldKeepParticle = td.keepParticle;
bool oldSwitchProcessor = td.switchProcessor;
scalar fraction = testParticle.trackToFace(position()+dt*U, td);
td.keepParticle = oldKeepParticle;
td.switchProcessor = oldSwitchProcessor;
// Adapt the dt to subdivide the trajectory into 4 substeps.
return dt *fraction/td.nSubCycle_;
}
Foam::vector Foam::streamLineParticle::interpolateFields
(
const streamLineParticle::trackData& td,
@ -170,34 +188,56 @@ bool Foam::streamLineParticle::move(streamLineParticle::trackData& td)
&& lifeTime_ > 0
)
{
// TBD: implement subcycling so step through cells in more than
// one step.
// set the lagrangian time-step
scalar dt = min(dtMax, tEnd);
// Store current position and sampled velocity.
--lifeTime_;
sampledPositions_.append(position());
vector U = interpolateFields(td, position(), cell());
if (!td.trackForward_)
// Cross cell in steps
for (label subIter = 0; subIter < td.nSubCycle_; subIter++)
{
U = -U;
}
--lifeTime_;
dt *= trackToFace(position()+dt*U, td);
// Store current position and sampled velocity.
sampledPositions_.append(position());
vector U = interpolateFields(td, position(), cell());
tEnd -= dt;
stepFraction() = 1.0 - tEnd/deltaT;
if (!td.trackForward_)
{
U = -U;
}
if (tEnd <= ROOTVSMALL)
{
// Force removal
lifeTime_ = 0;
if (subIter == 0 && td.nSubCycle_ > 1)
{
// Adapt dt to cross cell in a few steps
dt = calcSubCycleDeltaT(td, dt, U);
}
else if (subIter == td.nSubCycle_-1)
{
// Do full step on last subcycle
dt = min(dtMax, tEnd);
}
scalar fraction = trackToFace(position()+dt*U, td);
dt *= fraction;
tEnd -= dt;
stepFraction() = 1.0 - tEnd/deltaT;
if (tEnd <= ROOTVSMALL)
{
// Force removal
lifeTime_ = 0;
}
if (!td.keepParticle || td.switchProcessor || lifeTime_ == 0)
{
break;
}
}
}
if (!td.keepParticle || lifeTime_ == 0)
{
if (lifeTime_ == 0)