From 78d8d5206b0986e81690d2cee6b7202abef5a1f2 Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Tue, 8 Jan 2019 10:43:28 +0100
Subject: Extract refinement scaffolding into separate units
---
src/refinement/coupler2D.hh | 348 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 348 insertions(+)
create mode 100644 src/refinement/coupler2D.hh
(limited to 'src/refinement/coupler2D.hh')
diff --git a/src/refinement/coupler2D.hh b/src/refinement/coupler2D.hh
new file mode 100644
index 0000000..49efe57
--- /dev/null
+++ b/src/refinement/coupler2D.hh
@@ -0,0 +1,348 @@
+/* This file is part of the OpenLB library
+ *
+ * Copyright (C) 2019 Adrian Kummerländer
+ * E-mail contact: info@openlb.net
+ * The most recent release of OpenLB can be downloaded at
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+*/
+
+#ifndef REFINEMENT_COUPLER_2D_HH
+#define REFINEMENT_COUPLER_2D_HH
+
+#include "coupler2D.h"
+
+#include "dynamics/lbHelpers.h"
+
+namespace olb {
+
+
+template class DESCRIPTOR>
+void computeFeq(const Cell& cell, T fEq[DESCRIPTOR::q])
+{
+ T rho{};
+ T u[2] {};
+ cell.computeRhoU(rho, u);
+ const T uSqr = u[0]*u[0] + u[1]*u[1];
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ fEq[iPop] = lbHelpers::equilibrium(iPop, rho, u, uSqr);
+ }
+}
+
+template class DESCRIPTOR>
+void computeFneq(const Cell& cell, T fNeq[DESCRIPTOR::q])
+{
+ T rho{};
+ T u[2] {};
+ cell.computeRhoU(rho, u);
+ lbHelpers::computeFneq(cell, fNeq, rho, u);
+}
+
+template
+T order4interpolation(T fm3, T fm1, T f1, T f3)
+{
+ return 9./16. * (fm1 + f1) - 1./16. * (fm3 + f3);
+}
+
+template
+T order3interpolation(T fm1, T f1, T f3)
+{
+ return 3./8. * fm1 + 3./4. * f1 - 1./8. * f3;
+}
+
+template
+T order2interpolation(T f0, T f1)
+{
+ return 0.5 * (f0 + f1);
+}
+
+template class DESCRIPTOR>
+void computeRestrictedFneq(const SuperLattice2D& lattice, Vector pos, T restrictedFneq[DESCRIPTOR::q])
+{
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ T fNeq[DESCRIPTOR::q] {};
+ computeFneq(lattice.get(pos[0], pos[1] + DESCRIPTOR::c[iPop][0], pos[2] + DESCRIPTOR::c[iPop][1]), fNeq);
+
+ for (int jPop=0; jPop < DESCRIPTOR::q; ++jPop) {
+ restrictedFneq[jPop] += fNeq[jPop];
+ }
+ }
+
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ restrictedFneq[iPop] /= DESCRIPTOR::q;
+ }
+}
+
+
+template class DESCRIPTOR>
+Vector Coupler2D::getFineLatticeR(int y) const
+{
+ if (_vertical) {
+ return _fineOrigin + Vector {0, 0, y};
+ }
+ else {
+ return _fineOrigin + Vector {0, y, 0};
+ }
+}
+
+template class DESCRIPTOR>
+Vector Coupler2D::getCoarseLatticeR(int y) const
+{
+ if (_vertical) {
+ return _coarseOrigin + Vector {0, 0, y};
+ }
+ else {
+ return _coarseOrigin + Vector {0, y, 0};
+ }
+}
+
+template class DESCRIPTOR>
+Coupler2D::Coupler2D(Grid2D& coarse, Grid2D& fine,
+ Vector origin, Vector extend):
+ _coarse(coarse),
+ _fine(fine),
+ _coarseSize(floor(extend.norm() / coarse.getConverter().getPhysDeltaX() + 0.5)+1),
+ _fineSize(2*_coarseSize-1),
+ _vertical(util::nearZero(extend[0]))
+{
+ OLB_ASSERT(util::nearZero(extend[0]) || util::nearZero(extend[1]), "Coupling is only implemented alongside unit vectors");
+
+ const auto& coarseGeometry = _coarse.getCuboidGeometry();
+ const auto& fineGeometry = _fine.getCuboidGeometry();
+
+ Vector tmpLatticeOrigin{};
+ coarseGeometry.getLatticeR(origin, tmpLatticeOrigin);
+ _physOrigin = coarseGeometry.getPhysR(tmpLatticeOrigin.toStdVector());
+
+ coarseGeometry.getLatticeR(_physOrigin, _coarseOrigin);
+ fineGeometry.getLatticeR(_physOrigin, _fineOrigin);
+}
+
+
+template class DESCRIPTOR>
+FineCoupler2D::FineCoupler2D(Grid2D& coarse, Grid2D& fine,
+ Vector origin, Vector extend):
+ Coupler2D(coarse, fine, origin, extend),
+ _c2f_rho(this->_coarseSize),
+ _c2f_u(this->_coarseSize, Vector(T{})),
+ _c2f_fneq(this->_coarseSize, Vector::q>(T{}))
+{
+ OstreamManager clout(std::cout,"C2F");
+ clout << "coarse origin: " << this->_coarseOrigin[0] << " " << this->_coarseOrigin[1] << " " << this->_coarseOrigin[2] << std::endl;
+ clout << "fine origin: " << this->_fineOrigin[0] << " " << this->_fineOrigin[1] << " " << this->_fineOrigin[2] << std::endl;
+ clout << "fine size: " << this->_fineSize << std::endl;
+}
+
+template class DESCRIPTOR>
+void FineCoupler2D::store()
+{
+ auto& coarseLattice = this->_coarse.getSuperLattice();
+
+ for (int y=0; y < this->_coarseSize; ++y) {
+ const auto pos = this->getCoarseLatticeR(y);
+
+ T rho{};
+ T u[2] {};
+ T fNeq[DESCRIPTOR::q] {};
+ coarseLattice.get(pos).computeRhoU(rho, u);
+ computeFneq(coarseLattice.get(pos), fNeq);
+
+ _c2f_rho[y] = rho;
+ _c2f_u[y] = Vector(u);
+ _c2f_fneq[y] = Vector::q>(fNeq);
+ }
+}
+
+template class DESCRIPTOR>
+void FineCoupler2D::interpolate()
+{
+ auto& coarseLattice = this->_coarse.getSuperLattice();
+
+ for (int y=0; y < this->_coarseSize; ++y) {
+ const auto coarsePos = this->getCoarseLatticeR(y);
+
+ T rho{};
+ T u[2] {};
+ coarseLattice.get(coarsePos).computeRhoU(rho, u);
+ _c2f_rho[y] = order2interpolation(rho, _c2f_rho[y]);
+ _c2f_u[y][0] = order2interpolation(u[0], _c2f_u[y][0]);
+ _c2f_u[y][1] = order2interpolation(u[1], _c2f_u[y][1]);
+
+ T fNeq[DESCRIPTOR::q] {};
+ computeFneq(coarseLattice.get(coarsePos), fNeq);
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ _c2f_fneq[y][iPop] = order2interpolation(fNeq[iPop], _c2f_fneq[y][iPop]);
+ }
+ }
+}
+
+template class DESCRIPTOR>
+void FineCoupler2D::couple()
+{
+ auto& coarseLattice = this->_coarse.getSuperLattice();
+ auto& fineLattice = this->_fine.getSuperLattice();
+
+ for (int y=0; y < this->_coarseSize; ++y) {
+ const auto coarsePos = this->getCoarseLatticeR(y);
+ const auto finePos = this->getFineLatticeR(2*y);
+
+ T fEq[DESCRIPTOR::q] {};
+ computeFeq(coarseLattice.get(coarsePos), fEq);
+
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ fineLattice.get(finePos)[iPop] = fEq[iPop] + this->_coarse.getScalingFactor() * _c2f_fneq[y][iPop];
+ }
+ }
+
+ for (int y=1; y < this->_coarseSize-2; ++y) {
+ const T rho = order4interpolation(
+ _c2f_rho[y-1],
+ _c2f_rho[y],
+ _c2f_rho[y+1],
+ _c2f_rho[y+2]
+ );
+ T u[2] {};
+ u[0] = order4interpolation(
+ _c2f_u[y-1][0],
+ _c2f_u[y][0],
+ _c2f_u[y+1][0],
+ _c2f_u[y+2][0]
+ );
+ u[1] = order4interpolation(
+ _c2f_u[y-1][1],
+ _c2f_u[y][1],
+ _c2f_u[y+1][1],
+ _c2f_u[y+2][1]
+ );
+ const T uSqr = u[0]*u[0] + u[1]*u[1];
+
+ const auto finePos = this->getFineLatticeR(1+2*y);
+
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ const T fneq = order4interpolation(
+ _c2f_fneq[y-1][iPop],
+ _c2f_fneq[y][iPop],
+ _c2f_fneq[y+1][iPop],
+ _c2f_fneq[y+2][iPop]
+ );
+
+ fineLattice.get(finePos)[iPop] = lbHelpers::equilibrium(iPop, rho, u, uSqr) + this->_coarse.getScalingFactor() * fneq;
+ }
+ }
+
+ {
+ const T rho = order3interpolation(
+ _c2f_rho[0],
+ _c2f_rho[1],
+ _c2f_rho[2]
+ );
+ T u[2] {};
+ u[0] = order3interpolation(
+ _c2f_u[0][0],
+ _c2f_u[1][0],
+ _c2f_u[2][0]
+ );
+ u[1] = order3interpolation(
+ _c2f_u[0][1],
+ _c2f_u[1][1],
+ _c2f_u[2][1]
+ );
+ const T uSqr = u[0]*u[0] + u[1]*u[1];
+
+ const auto finePos = this->getFineLatticeR(1);
+
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ const T fneq = order3interpolation(
+ _c2f_fneq[0][iPop],
+ _c2f_fneq[1][iPop],
+ _c2f_fneq[2][iPop]
+ );
+ fineLattice.get(finePos)[iPop] = lbHelpers::equilibrium(iPop, rho, u, uSqr) + this->_coarse.getScalingFactor() * fneq;
+ }
+ }
+
+ {
+ const T rho = order3interpolation(
+ _c2f_rho[this->_coarseSize-1],
+ _c2f_rho[this->_coarseSize-2],
+ _c2f_rho[this->_coarseSize-3]
+ );
+ T u[2] {};
+ u[0] = order3interpolation(
+ _c2f_u[this->_coarseSize-1][0],
+ _c2f_u[this->_coarseSize-2][0],
+ _c2f_u[this->_coarseSize-3][0]
+ );
+ u[1] = order3interpolation(
+ _c2f_u[this->_coarseSize-1][1],
+ _c2f_u[this->_coarseSize-2][1],
+ _c2f_u[this->_coarseSize-3][1]
+ );
+ const T uSqr = u[0]*u[0] + u[1]*u[1];
+
+ const auto finePos = this->getFineLatticeR(this->_fineSize-2);
+
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ const T fneq = order3interpolation(
+ _c2f_fneq[this->_coarseSize-1][iPop],
+ _c2f_fneq[this->_coarseSize-2][iPop],
+ _c2f_fneq[this->_coarseSize-3][iPop]
+ );
+ fineLattice.get(finePos)[iPop] = lbHelpers::equilibrium(iPop, rho, u, uSqr) + this->_coarse.getScalingFactor() * fneq;
+ }
+ }
+}
+
+
+template class DESCRIPTOR>
+CoarseCoupler2D::CoarseCoupler2D(
+ Grid2D& coarse, Grid2D& fine,
+ Vector origin, Vector extend):
+ Coupler2D(coarse, fine, origin, extend)
+{
+ OstreamManager clout(std::cout,"F2C");
+ clout << "coarse origin: " << this->_coarseOrigin[0] << " " << this->_coarseOrigin[1] << " " << this->_coarseOrigin[2] << std::endl;
+ clout << "fine origin: " << this->_fineOrigin[0] << " " << this->_fineOrigin[1] << " " << this->_fineOrigin[2] << std::endl;
+ clout << "coarse size: " << this->_coarseSize << std::endl;
+}
+
+template class DESCRIPTOR>
+void CoarseCoupler2D::couple()
+{
+ auto& fineLattice = this->_fine.getSuperLattice();
+ auto& coarseLattice = this->_coarse.getSuperLattice();
+
+ for (int y=0; y < this->_coarseSize; ++y) {
+ const auto finePos = this->getFineLatticeR(2*y);
+ const auto coarsePos = this->getCoarseLatticeR(y);
+
+ T fEq[DESCRIPTOR::q] {};
+ computeFeq(fineLattice.get(finePos), fEq);
+
+ T fNeq[DESCRIPTOR::q] {};
+ computeRestrictedFneq(fineLattice, finePos, fNeq);
+
+ for (int iPop=0; iPop < DESCRIPTOR::q; ++iPop) {
+ coarseLattice.get(coarsePos)[iPop] = fEq[iPop] + this->_coarse.getInvScalingFactor() * fNeq[iPop];
+ }
+ }
+}
+
+
+}
+
+#endif
--
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