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Diffstat (limited to 'src/boundary/inamuroAnalyticalDynamics.hh')
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diff --git a/src/boundary/inamuroAnalyticalDynamics.hh b/src/boundary/inamuroAnalyticalDynamics.hh new file mode 100644 index 0000000..5509dfd --- /dev/null +++ b/src/boundary/inamuroAnalyticalDynamics.hh @@ -0,0 +1,159 @@ +/* This file is part of the OpenLB library + * + * Copyright (C) 2006, Orestis Malaspinas and 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 INAMURO_ANALYTICAL_DYNAMICS_HH +#define INAMURO_ANALYTICAL_DYNAMICS_HH + +#include "inamuroAnalyticalDynamics.h" +#include "dynamics/latticeDescriptors.h" +#include "core/util.h" +#include "dynamics/lbHelpers.h" +#include <cmath> + +namespace olb { + +template<typename T, typename DESCRIPTOR, typename Dynamics, int direction, int orientation> +InamuroAnalyticalDynamics<T,DESCRIPTOR,Dynamics,direction,orientation>::InamuroAnalyticalDynamics ( + T omega_, Momenta<T,DESCRIPTOR>& momenta_ ) + : BasicDynamics<T,DESCRIPTOR>(momenta_), + boundaryDynamics(omega_, momenta_) +{ } + +template<typename T, typename DESCRIPTOR, typename Dynamics, int direction, int orientation> +T InamuroAnalyticalDynamics<T,DESCRIPTOR, Dynamics, direction, orientation>:: +computeEquilibrium(int iPop, T rho, const T u[DESCRIPTOR::d], T uSqr) const +{ + return boundaryDynamics.computeEquilibrium(iPop, rho, u, uSqr); +} + +template<typename T, typename DESCRIPTOR, typename Dynamics, int direction, int orientation> +void InamuroAnalyticalDynamics<T,DESCRIPTOR,Dynamics,direction,orientation>::collide ( + Cell<T,DESCRIPTOR>& cell, + LatticeStatistics<T>& statistics ) +{ + typedef DESCRIPTOR L; + + // Along all the commented parts of this code there will be an example based + // on the situation where the wall's normal vector if (0,1) and the + // numerotation of the velocites are done according to the D2Q9 + // lattice of the OpenLB library. + + // Find all the missing populations + // (directions 3,4,5) + std::vector<int> missInd = + util::subIndexOutgoing<L,direction,orientation>(); + + // Will contain the missing poputations that are not normal to the wall. + // (directions 3,5) + std::vector<int> missDiagInd = missInd; + + for (unsigned iPop = 0; iPop < missInd.size(); ++iPop) { + int numOfNonNullComp = 0; + for (int iDim = 0; iDim < L::d; ++iDim) { + numOfNonNullComp += abs(descriptors::c<L>(missInd[iPop],iDim)); + } + + if (numOfNonNullComp == 1) { + missDiagInd.erase(missDiagInd.begin()+iPop); + break; + } + } + + // Will contain the populations normal to the wall's normal vector. + // (directions 2,6) + std::vector<int> perpInd = util::subIndex<L,direction,0>(); + for (unsigned iPop = 0; iPop < perpInd.size(); ++iPop) { + if (descriptors::c<L>(perpInd[iPop],0) == 0 && descriptors::c<L>(perpInd[iPop],1) == 0) { + perpInd.erase(perpInd.begin() + iPop); + break; + } + } + + T rho, u[L::d]; + this->_momenta.computeRhoU(cell, rho, u); + + T rhoCs = T(); + T uCs[L::d]; + for (int iDim = 0; iDim < L::d; ++iDim) { + uCs[iDim] = T(); + } + + T fSum = T(); + for (unsigned iPop = 0; iPop < missInd.size(); ++iPop) { + fSum += cell[util::opposite<L>(missInd[iPop])]; + } + // do not forget the "+1" in the rhoCs equation in the numerator (it's + // here because fEq = usualfEq - t[i] + rhoCs = ((T)6 * (-orientation * rho * u[direction] + fSum) + (T)1) / + ((T)3 * u[direction] * u[direction] - orientation * (T)3 * u[direction] + (T)1); + + T fDiffPerp = T(); + for (unsigned iPop = 0; iPop < perpInd.size(); ++iPop) { + fDiffPerp += descriptors::c<L>(perpInd[iPop],(direction + 1)%2) * cell[perpInd[iPop]]; + } + fDiffPerp *= orientation; + + T fDiffDiag = T(); + for (unsigned iPop = 0; iPop < missDiagInd.size(); ++iPop) + fDiffDiag += descriptors::c<L>(util::opposite<L>(missDiagInd[iPop]),(direction + 1)%2) + * cell[util::opposite<L>(missDiagInd[iPop])]; + fDiffDiag *= orientation; + + uCs[(direction + 1)%L::d] = ( + - orientation * (T)6 * rho * u[(direction+1)%L::d] + + orientation * rhoCs * u[(direction+1)%L::d] + - (T)3 * rhoCs * u[direction]*u[(direction+1)%L::d] + + (T)6*(fDiffPerp + fDiffDiag)) + / ( + rhoCs * (-orientation + (T)3 * u[direction])); + + for (int iDim = 0; iDim < L::d; ++iDim) { + uCs[iDim] += u[iDim]; + } + + T uSqr = util::normSqr<T,L::d>(uCs); + + for (unsigned iPop = 0; iPop < missInd.size(); ++iPop) { + cell[missInd[iPop]] = computeEquilibrium(missInd[iPop], rhoCs, uCs, uSqr); + } + + boundaryDynamics.collide(cell, statistics); +} + +template<typename T, typename DESCRIPTOR, typename Dynamics, int direction, int orientation> +T InamuroAnalyticalDynamics<T,DESCRIPTOR,Dynamics,direction,orientation>::getOmega() const +{ + return boundaryDynamics.getOmega(); +} + +template<typename T, typename DESCRIPTOR, typename Dynamics, int direction, int orientation> +void InamuroAnalyticalDynamics<T,DESCRIPTOR,Dynamics,direction,orientation>::setOmega(T omega_) +{ + boundaryDynamics.setOmega(omega_); +} + + +} // namespace olb + + +#endif |