bool Foam::KinematicParcel<ParcelType>::hitPatch
(
const polyPatch& pp,
TrackData& td,
const label patchI,
const scalar trackFraction,
const tetIndices& tetIs
)
{
typename TrackData::cloudType::parcelType& p =
static_cast<typename TrackData::cloudType::parcelType&>(*this);
// Invoke post-processing model
td.cloud().functions().postPatch(p, patchI, pp.whichFace(p.face()));
// Invoke surface film model
if (td.cloud().surfaceFilm().transferParcel(p, pp, td.keepParticle))
{
// All interactions done
return true;
}
else
{
// Invoke patch interaction model
return td.cloud().patchInteraction().correct
(
p,
pp,
td.keepParticle,
trackFraction,
tetIs
);
}
}
void Foam::KinematicCloud<CloudType>::patchData
(
const parcelType& p,
const polyPatch& pp,
const scalar trackFraction,
const tetIndices& tetIs,
vector& nw,
vector& Up
) const
{
label patchi = pp.index();
label patchFacei = pp.whichFace(p.face());
vector n = tetIs.faceTri(mesh_).normal();
n /= mag(n);
vector U = U_.boundaryField()[patchi][patchFacei];
// Unless the face is rotating, the required normal is n;
nw = n;
if (!mesh_.moving())
{
// Only wall patches may have a non-zero wall velocity from
// the velocity field when the mesh is not moving.
if (isA<wallPolyPatch>(pp))
{
Up = U;
}
else
{
Up = Zero;
}
}
else
{
vector U00 = U_.oldTime().boundaryField()[patchi][patchFacei];
vector n00 = tetIs.oldFaceTri(mesh_).normal();
// Difference in normal over timestep
vector dn = Zero;
if (mag(n00) > SMALL)
{
// If the old normal is zero (for example in layer
// addition) then use the current normal, meaning that the
// motion can only be translational, and dn remains zero,
// otherwise, calculate dn:
n00 /= mag(n00);
dn = n - n00;
}
// Total fraction through the timestep of the motion,
// including stepFraction before the current tracking step
// and the current trackFraction
// i.e.
// let s = stepFraction, t = trackFraction
// Motion of x in time:
// |-----------------|---------|---------|
// x00 x0 xi x
//
// where xi is the correct value of x at the required
// tracking instant.
//
// x0 = x00 + s*(x - x00) = s*x + (1 - s)*x00
//
// i.e. the motion covered by previous tracking portions
// within this timestep, and
//
// xi = x0 + t*(x - x0)
// = t*x + (1 - t)*x0
// = t*x + (1 - t)*(s*x + (1 - s)*x00)
// = (s + t - s*t)*x + (1 - (s + t - s*t))*x00
//
// let m = (s + t - s*t)
//
// xi = m*x + (1 - m)*x00 = x00 + m*(x - x00);
//
// In the same form as before.
scalar m =
p.stepFraction()
+ trackFraction
- (p.stepFraction()*trackFraction);
// When the mesh is moving, the velocity field on wall patches
// will contain the velocity associated with the motion of the
// mesh, in which case it is interpolated in time using m.
// For other patches the face velocity will need to be
// reconstructed from the face centre motion.
const vector& Cf = mesh_.faceCentres()[p.face()];
vector Cf00 = mesh_.faces()[p.face()].centre(mesh_.oldPoints());
if (isA<wallPolyPatch>(pp))
{
Up = U00 + m*(U - U00);
}
else
{
Up = (Cf - Cf00)/mesh_.time().deltaTValue();
}
if (mag(dn) > SMALL)
{
// Rotational motion, nw requires interpolation and a
// rotational velocity around face centre correction to Up
// is required.
nw = n00 + m*dn;
// Cf at tracking instant
vector Cfi = Cf00 + m*(Cf - Cf00);
// Normal vector cross product
vector omega = (n00 ^ n);
scalar magOmega = mag(omega);
// magOmega = sin(angle between unit normals)
// Normalise omega vector by magOmega, then multiply by
// angle/dt to give the correct angular velocity vector.
omega *= Foam::asin(magOmega)/(magOmega*mesh_.time().deltaTValue());
// Project position onto face and calculate this position
// relative to the face centre.
vector facePos =
p.position()
- ((p.position() - Cfi) & nw)*nw
- Cfi;
Up += (omega ^ facePos);
}
// No further action is required if the motion is
// translational only, nw and Up have already been set.
}
}
bool Foam::StandardWallInteraction<CloudType>::correct
(
const polyPatch& pp,
const label faceId,
bool& keepParticle,
vector& U
) const
{
if (pp.isWall())
{
switch (interactionType_)
{
case PatchInteractionModel<CloudType>::itEscape:
{
keepParticle = false;
U = vector::zero;
break;
}
case PatchInteractionModel<CloudType>::itStick:
{
keepParticle = true;
U = vector::zero;
break;
}
case PatchInteractionModel<CloudType>::itRebound:
{
keepParticle = true;
vector nw = pp.faceAreas()[pp.whichFace(faceId)];
nw /= mag(nw);
scalar Un = U & nw;
vector Ut = U - Un*nw;
if (Un > 0)
{
U -= (1.0 + e_)*Un*nw;
}
U -= mu_*Ut;
break;
}
default:
{
FatalErrorIn
(
"bool StandardWallInteraction<CloudType>::correct"
"("
"const polyPatch&, "
"const label, "
"bool&, "
"vector&"
") const"
) << "Unknown interaction type "
<< this->interactionTypeToWord(interactionType_)
<< "(" << interactionType_ << ")" << endl
<< abort(FatalError);
}
}
return true;
}
return false;
}
bool Foam::LocalInteraction<CloudType>::correct
(
typename CloudType::parcelType& p,
const polyPatch& pp,
bool& keepParticle,
const scalar trackFraction,
const tetIndices& tetIs
)
{
label patchI = patchData_.applyToPatch(pp.index());
if (patchI >= 0)
{
vector& U = p.U();
bool& active = p.active();
typename PatchInteractionModel<CloudType>::interactionType it =
this->wordToInteractionType
(
patchData_[patchI].interactionTypeName()
);
switch (it)
{
case PatchInteractionModel<CloudType>::itEscape:
{
scalar dm = p.mass()*p.nParticle();
keepParticle = false;
active = false;
U = vector::zero;
nEscape_[patchI]++;
massEscape_[patchI] += dm;
if (writeFields_)
{
label pI = pp.index();
label fI = pp.whichFace(p.face());
massEscape().boundaryField()[pI][fI] += dm;
}
break;
}
case PatchInteractionModel<CloudType>::itStick:
{
scalar dm = p.mass()*p.nParticle();
keepParticle = true;
active = false;
U = vector::zero;
nStick_[patchI]++;
massStick_[patchI] += dm;
if (writeFields_)
{
label pI = pp.index();
label fI = pp.whichFace(p.face());
massStick().boundaryField()[pI][fI] += dm;
}
break;
}
case PatchInteractionModel<CloudType>::itRebound:
{
keepParticle = true;
active = true;
vector nw;
vector Up;
this->owner().patchData(p, pp, trackFraction, tetIs, nw, Up);
// Calculate motion relative to patch velocity
U -= Up;
scalar Un = U & nw;
vector Ut = U - Un*nw;
if (Un > 0)
{
U -= (1.0 + patchData_[patchI].e())*Un*nw;
}
U -= patchData_[patchI].mu()*Ut;
// Return velocity to global space
U += Up;
break;
}
default:
{
FatalErrorIn
(
"bool LocalInteraction<CloudType>::correct"
"("
"typename CloudType::parcelType&, "
"const polyPatch&, "
"bool&, "
"const scalar, "
"const tetIndices&"
") const"
) << "Unknown interaction type "
<< patchData_[patchI].interactionTypeName()
<< "(" << it << ") for patch "
<< patchData_[patchI].patchName()
<< ". Valid selections are:" << this->interactionTypeNames_
<< endl << abort(FatalError);
}
}
return true;
}
return false;
}