latticePhysShearRateMag3D.hh

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/*  This file is part of the OpenLB library
 *
 *  Copyright (C) 2012 Lukas Baron, Tim Dornieden, Mathias J. Krause,
 *  Albert Mink
 *  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 LATTICE_PHYS_SHEAR_RATE_MAG_3D_HH
#define LATTICE_PHYS_SHEAR_RATE_MAG_3D_HH
 
#include<vector>    // for generic i/o
#include<cmath>     // for lpnorm
#include<math.h>
 
#include "latticePhysShearRateMag3D.h"
#include "superBaseF3D.h"
#include "functors/analytical/indicator/indicatorBaseF3D.h"
#include "indicator/superIndicatorF3D.h"
#include "dynamics/lbm.h"  // for computation of lattice rho and velocity
#include "geometry/superGeometry.h"
#include "blockBaseF3D.h"
#include "communication/mpiManager.h"
#include "utilities/vectorHelpers.h"
 
namespace olb {
 
template<typename T, typename DESCRIPTOR>
SuperLatticePhysShearRateMag3D<T, DESCRIPTOR>::SuperLatticePhysShearRateMag3D(
  SuperLattice<T, DESCRIPTOR>& sLattice, const UnitConverter<T,DESCRIPTOR>& converter)
  : SuperLatticePhysF3D<T, DESCRIPTOR>(sLattice, converter, 1)
{
  this->getName() = "physShearRateMag";
  const int maxC = this->_sLattice.getLoadBalancer().size();
  this->_blockF.reserve(maxC);
  for (int iC = 0; iC < maxC; iC++) {
    this->_blockF.emplace_back(
      new BlockLatticePhysShearRateMag3D<T, DESCRIPTOR>(
        this->_sLattice.getBlock(iC),
        this->_converter)
    );
  }
}
 
template<typename T, typename DESCRIPTOR>
BlockLatticePhysShearRateMag3D<T, DESCRIPTOR>::BlockLatticePhysShearRateMag3D(
  BlockLattice<T, DESCRIPTOR>& blockLattice,
  const UnitConverter<T,DESCRIPTOR>& converter)
  : BlockLatticePhysF3D<T, DESCRIPTOR>(blockLattice, converter, 9)
{
  this->getName() = "shearRateMag";
}
 
template<typename T, typename DESCRIPTOR>
bool BlockLatticePhysShearRateMag3D<T, DESCRIPTOR>::operator()(T output[], const int input[])
{
  T rho, uTemp[DESCRIPTOR::d], pi[util::TensorVal<DESCRIPTOR >::n];
  Cell<T,DESCRIPTOR> cell = this->_blockLattice.get(input);
  cell.computeAllMomenta(rho, uTemp, pi);
  T omega = DESCRIPTOR::template provides<descriptors::OMEGA>()
  ? cell.template getField<descriptors::OMEGA>()
  : 1. / this->_converter.getLatticeRelaxationTime();
 
  T pre2 = util::pow(descriptors::invCs2<T,DESCRIPTOR>()/2.* omega/rho,2.); // strain rate tensor prefactor
  T gamma{};
  if constexpr (DESCRIPTOR::template provides<descriptors::FORCE>()) {
    const auto force = cell.template getField<descriptors::FORCE>();
    gamma = util::sqrt(2.*pre2*lbm<DESCRIPTOR>::computePiNeqNormSqr(cell, force)); // shear rate
  } else {
    gamma = util::sqrt(2.*pre2*lbm<DESCRIPTOR>::computePiNeqNormSqr(cell)); // shear rate
  }
 
  output[0] = gamma / this->_converter.getConversionFactorTime();
 
  return true;
}
 
}
#endif