void Foam::GaussSeidelSmoother::smooth
(
const word& fieldName_,
scalarField& psi,
const lduMatrix& matrix_,
const scalarField& source,
const FieldField<Field, scalar>& interfaceBouCoeffs_,
const lduInterfaceFieldPtrsList& interfaces_,
const direction cmpt,
const label nSweeps
)
{
register scalar* psiPtr = psi.begin();
register const label nCells = psi.size();
scalarField bPrime(nCells);
register scalar* bPrimePtr = bPrime.begin();
register const scalar* const diagPtr = matrix_.diag().begin();
register const scalar* const upperPtr =
matrix_.upper().begin();
register const scalar* const lowerPtr =
matrix_.lower().begin();
register const label* const uPtr =
matrix_.lduAddr().upperAddr().begin();
register const label* const ownStartPtr =
matrix_.lduAddr().ownerStartAddr().begin();
// Parallel boundary initialisation. The parallel boundary is treated
// as an effective jacobi interface in the boundary.
// Note: there is a change of sign in the coupled
// interface update. The reason for this is that the
// internal coefficients are all located at the l.h.s. of
// the matrix whereas the "implicit" coefficients on the
// coupled boundaries are all created as if the
// coefficient contribution is of a source-kind (i.e. they
// have a sign as if they are on the r.h.s. of the matrix.
// To compensate for this, it is necessary to turn the
// sign of the contribution.
FieldField<Field, scalar> mBouCoeffs(interfaceBouCoeffs_.size());
forAll(mBouCoeffs, patchi)
{
if (interfaces_.set(patchi))
{
mBouCoeffs.set(patchi, -interfaceBouCoeffs_[patchi]);
}
}
for (label sweep=0; sweep<nSweeps; sweep++)
{
bPrime = source;
matrix_.initMatrixInterfaces
(
mBouCoeffs,
interfaces_,
psi,
bPrime,
cmpt
);
matrix_.updateMatrixInterfaces
(
mBouCoeffs,
interfaces_,
psi,
bPrime,
cmpt
);
register scalar curPsi;
register label fStart;
register label fEnd = ownStartPtr[0];
for (register label cellI=0; cellI<nCells; cellI++)
{
// Start and end of this row
fStart = fEnd;
fEnd = ownStartPtr[cellI + 1];
// Get the accumulated neighbour side
curPsi = bPrimePtr[cellI];
// Accumulate the owner product side
for (register label curFace=fStart; curFace<fEnd; curFace++)
{
curPsi -= upperPtr[curFace]*psiPtr[uPtr[curFace]];
}
// Finish current psi
curPsi /= diagPtr[cellI];
// Distribute the neighbour side using current psi
for (register label curFace=fStart; curFace<fEnd; curFace++)
{
bPrimePtr[uPtr[curFace]] -= lowerPtr[curFace]*curPsi;
}
psiPtr[cellI] = curPsi;
}
}
}
void Foam::symGaussSeidelSmoother::smooth
(
const word& fieldName_,
scalarField& psi,
const lduMatrix& matrix_,
const scalarField& source,
const FieldField<Field, scalar>& interfaceBouCoeffs_,
const lduInterfaceFieldPtrsList& interfaces_,
const direction cmpt,
const label nSweeps
)
{
scalar* __restrict__ psiPtr = psi.begin();
const label nCells = psi.size();
scalarField bPrime(nCells);
scalar* __restrict__ bPrimePtr = bPrime.begin();
const scalar* const __restrict__ diagPtr = matrix_.diag().begin();
const scalar* const __restrict__ upperPtr =
matrix_.upper().begin();
const scalar* const __restrict__ lowerPtr =
matrix_.lower().begin();
const label* const __restrict__ uPtr =
matrix_.lduAddr().upperAddr().begin();
const label* const __restrict__ ownStartPtr =
matrix_.lduAddr().ownerStartAddr().begin();
// Parallel boundary initialisation. The parallel boundary is treated
// as an effective jacobi interface in the boundary.
// Note: there is a change of sign in the coupled
// interface update. The reason for this is that the
// internal coefficients are all located at the l.h.s. of
// the matrix whereas the "implicit" coefficients on the
// coupled boundaries are all created as if the
// coefficient contribution is of a source-kind (i.e. they
// have a sign as if they are on the r.h.s. of the matrix.
// To compensate for this, it is necessary to turn the
// sign of the contribution.
FieldField<Field, scalar>& mBouCoeffs =
const_cast<FieldField<Field, scalar>&>
(
interfaceBouCoeffs_
);
forAll(mBouCoeffs, patchi)
{
if (interfaces_.set(patchi))
{
mBouCoeffs[patchi].negate();
}
}
for (label sweep=0; sweep<nSweeps; sweep++)
{
bPrime = source;
matrix_.initMatrixInterfaces
(
mBouCoeffs,
interfaces_,
psi,
bPrime,
cmpt
);
matrix_.updateMatrixInterfaces
(
mBouCoeffs,
interfaces_,
psi,
bPrime,
cmpt
);
scalar psii;
label fStart;
label fEnd = ownStartPtr[0];
for (label celli=0; celli<nCells; celli++)
{
// Start and end of this row
fStart = fEnd;
fEnd = ownStartPtr[celli + 1];
// Get the accumulated neighbour side
psii = bPrimePtr[celli];
// Accumulate the owner product side
for (label facei=fStart; facei<fEnd; facei++)
{
psii -= upperPtr[facei]*psiPtr[uPtr[facei]];
}
// Finish current psi
psii /= diagPtr[celli];
// Distribute the neighbour side using current psi
for (label facei=fStart; facei<fEnd; facei++)
{
bPrimePtr[uPtr[facei]] -= lowerPtr[facei]*psii;
}
psiPtr[celli] = psii;
}
fStart = ownStartPtr[nCells];
for (label celli=nCells-1; celli>=0; celli--)
{
// Start and end of this row
fEnd = fStart;
fStart = ownStartPtr[celli];
// Get the accumulated neighbour side
psii = bPrimePtr[celli];
// Accumulate the owner product side
for (label facei=fStart; facei<fEnd; facei++)
{
psii -= upperPtr[facei]*psiPtr[uPtr[facei]];
}
// Finish psi for this cell
psii /= diagPtr[celli];
// Distribute the neighbour side using psi for this cell
for (label facei=fStart; facei<fEnd; facei++)
{
bPrimePtr[uPtr[facei]] -= lowerPtr[facei]*psii;
}
psiPtr[celli] = psii;
}
}
// Restore interfaceBouCoeffs_
forAll(mBouCoeffs, patchi)
{
if (interfaces_.set(patchi))
{
mBouCoeffs[patchi].negate();
}
}
}