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/* This file is part of the OpenLB library
*
* Copyright (C) 2008 Orestis Malaspinas, Andrea Parmigiani, Jonas Latt
* E-mail contact: info@openlb.net
* The most recent release of OpenLB can be downloaded at
* <http://www.openlb.net/>
*
* 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 SHAN_CHEN_FORCED_POST_PROCESSOR_2D_HH
#define SHAN_CHEN_FORCED_POST_PROCESSOR_2D_HH
#include "shanChenForcedPostProcessor2D.h"
#include "interactionPotential.h"
#include "core/blockLattice2D.h"
#include "core/util.h"
#include "core/finiteDifference2D.h"
namespace olb {
//////// ShanChenForcedPostProcessor2D ///////////////////////////////////
template<typename T, typename DESCRIPTOR>
ShanChenForcedPostProcessor2D <T,DESCRIPTOR>::
ShanChenForcedPostProcessor2D(int x0_, int x1_, int y0_, int y1_, T G_,
std::vector<T> rho0_, AnalyticalF1D<T,T>& iP_,
std::vector<SpatiallyExtendedObject2D*> partners_)
: x0(x0_), x1(x1_), y0(y0_), y1(y1_), G(G_), rho0(rho0_), interactionPotential(iP_), partners(partners_)
{ }
template<typename T, typename DESCRIPTOR>
ShanChenForcedPostProcessor2D <T,DESCRIPTOR>::
ShanChenForcedPostProcessor2D(T G_,
std::vector<T> rho0_, AnalyticalF1D<T,T>& iP_,
std::vector<SpatiallyExtendedObject2D*> partners_)
: x0(0), x1(0), y0(0), y1(0), G(G_), rho0(rho0_), interactionPotential(iP_), partners(partners_)
{ }
template<typename T, typename DESCRIPTOR>
void ShanChenForcedPostProcessor2D<T,DESCRIPTOR>::
processSubDomain( BlockLattice2D<T,DESCRIPTOR>& blockLattice,
int x0_, int x1_, int y0_, int y1_ )
{
typedef DESCRIPTOR L;
BlockLattice2D<T,DESCRIPTOR> *partnerLattice = dynamic_cast<BlockLattice2D<T,DESCRIPTOR> *>(partners[0]);
int newX0, newX1, newY0, newY1;
if ( util::intersect ( x0, x1, y0, y1,
x0_, x1_, y0_, y1_,
newX0, newX1, newY0, newY1 ) ) {
int nx = newX1-newX0+3; // include a one-cell boundary
int ny = newY1-newY0+3; // include a one-cell boundary
int offsetX = newX0-1;
int offsetY = newY0-1;
BlockData2D<T,T> rhoField1(nx, ny);
BlockData2D<T,T> rhoField2(nx, ny);
// Compute density and velocity on every site of first lattice, and store result
// in external scalars; envelope cells are included, because they are needed
// to compute the interaction potential in what follows.
for (int iX=newX0-1; iX<=newX1+1; ++iX) {
for (int iY=newY0-1; iY<=newY1+1; ++iY) {
Cell<T,DESCRIPTOR>& cell = blockLattice.get(iX,iY);
rhoField1.get(iX-offsetX, iY-offsetY) = cell.computeRho()*rho0[0];
}
}
// Compute density and velocity on every site of second lattice, and store result
// in external scalars; envelope cells are included, because they are needed
// to compute the interaction potential in what follows.
for (int iX=newX0-1; iX<=newX1+1; ++iX) {
for (int iY=newY0-1; iY<=newY1+1; ++iY) {
Cell<T,DESCRIPTOR>& cell = partnerLattice->get(iX,iY);
rhoField2.get(iX-offsetX, iY-offsetY) = cell.computeRho()*rho0[1];
}
}
for (int iX=newX0; iX<=newX1; ++iX) {
for (int iY=newY0; iY<=newY1; ++iY) {
Cell<T,DESCRIPTOR>& blockCell = blockLattice.get(iX,iY);
Cell<T,DESCRIPTOR>& partnerCell = partnerLattice->get(iX,iY);
T* j = blockCell.template getFieldPointer<descriptors::VELOCITY>();
lbHelpers<T,DESCRIPTOR>::computeJ(blockCell,j);
j = partnerCell.template getFieldPointer<descriptors::VELOCITY>();
lbHelpers<T,DESCRIPTOR>::computeJ(partnerCell,j);
T blockOmega = blockLattice.getDynamics(iX, iY)->getOmega();
T partnerOmega = partnerLattice->getDynamics(iX, iY)->getOmega();
// Computation of the common velocity, shared among the two populations
T rhoTot = rhoField1.get(iX-offsetX, iY-offsetY)*blockOmega +
rhoField2.get(iX-offsetX, iY-offsetY)*partnerOmega;
T uTot[DESCRIPTOR::d];
T* blockU = blockCell.template getFieldPointer<descriptors::VELOCITY>(); // contains precomputed value rho*u
T* partnerU = partnerCell.template getFieldPointer<descriptors::VELOCITY>(); // contains precomputed value rho*u
for (int iD = 0; iD < DESCRIPTOR::d; ++iD) {
uTot[iD] = (blockU[iD]*rho0[0]*blockOmega + partnerU[iD]*rho0[1]*partnerOmega) / rhoTot;
}
// Computation of the interaction potential
T rhoBlockContribution[L::d] = {T(), T()};
T rhoPartnerContribution[L::d] = {T(), T()};
T psi2;
T psi1;
interactionPotential(&psi2, &rhoField2.get(iX-offsetX, iY-offsetY));
interactionPotential(&psi1, &rhoField1.get(iX-offsetX, iY-offsetY));
for (int iPop = 0; iPop < L::q; ++iPop) {
int nextX = iX + descriptors::c<L>(iPop,0);
int nextY = iY + descriptors::c<L>(iPop,1);
T blockRho;
T partnerRho;
interactionPotential(&blockRho, &rhoField1.get(nextX-offsetX, nextY-offsetY));//rho0[0];
interactionPotential(&partnerRho, &rhoField2.get(nextX-offsetX, nextY-offsetY));///rho0[1];
for (int iD = 0; iD < L::d; ++iD) {
rhoBlockContribution[iD] += psi2 * blockRho * descriptors::c<L>(iPop,iD)* descriptors::t<T,L>(iPop);
rhoPartnerContribution[iD] += psi1 * partnerRho * descriptors::c<L>(iPop,iD)* descriptors::t<T,L>(iPop);
}
}
// Computation and storage of the final velocity, consisting
// of u and the momentum difference due to interaction
// potential plus external force
T *blockForce = blockCell.template getFieldPointer<descriptors::FORCE>();
T *partnerForce = partnerCell.template getFieldPointer<descriptors::FORCE>();
T *externalBlockForce = blockCell.template getFieldPointer<descriptors::EXTERNAL_FORCE>();
T *externalPartnerForce = partnerCell.template getFieldPointer<descriptors::EXTERNAL_FORCE>();
for (int iD = 0; iD < L::d; ++iD) {
blockU[iD] = uTot[iD];
blockForce[iD] = externalBlockForce[iD] - G*rhoPartnerContribution[iD]/rhoField1.get(iX-offsetX, iY-offsetY);
partnerU[iD] = uTot[iD];
partnerForce[iD] = externalPartnerForce[iD] - G*rhoBlockContribution[iD]/rhoField2.get(iX-offsetX, iY-offsetY);
}
}
}
}
}
template<typename T, typename DESCRIPTOR>
void ShanChenForcedPostProcessor2D<T,DESCRIPTOR>::
process(BlockLattice2D<T,DESCRIPTOR>& blockLattice)
{
processSubDomain(blockLattice, x0, x1, y0, y1);
}
/// LatticeCouplingGenerator for NS coupling
template<typename T, typename DESCRIPTOR>
ShanChenForcedGenerator2D<T,DESCRIPTOR>::ShanChenForcedGenerator2D (
int x0_, int x1_, int y0_, int y1_, T G_, std::vector<T> rho0_, AnalyticalF1D<T,T>& iP_ )
: LatticeCouplingGenerator2D<T,DESCRIPTOR>(x0_, x1_, y0_, y1_), G(G_), rho0(rho0_), interactionPotential(iP_)
{ }
template<typename T, typename DESCRIPTOR>
ShanChenForcedGenerator2D<T,DESCRIPTOR>::ShanChenForcedGenerator2D (
T G_, std::vector<T> rho0_, AnalyticalF1D<T,T>& iP_ )
: LatticeCouplingGenerator2D<T,DESCRIPTOR>(0, 0, 0, 0), G(G_
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