Riemann1.cpp

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/*
 * This file is part of Vlasiator.
 * Copyright 2010-2016 Finnish Meteorological Institute
 *
 * For details of usage, see the COPYING file and read the "Rules of the Road"
 * at http://www.physics.helsinki.fi/vlasiator/
 *
 * 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.
 */
 
#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <cmath>
 
#include "../../common.h"
#include "../../readparameters.h"
#include "../../backgroundfield/backgroundfield.h"
#include "../../object_wrapper.h"
 
#include "Riemann1.h"
 
using namespace std;
 
namespace projects {
   Riemann1::Riemann1(): Project() { }
   Riemann1::~Riemann1() { }
 
   bool Riemann1::initialize(void) {return Project::initialize();}
 
   void Riemann1::addParameters(){
      typedef Readparameters RP;
      RP::add("Riemann.rho1", "Number density, left state (m^-3)", 0.0);
      RP::add("Riemann.rho2", "Number density, right state (m^-3)", 0.0);
      RP::add("Riemann.T1", "Temperature, left state (K)", 0.0);
      RP::add("Riemann.T2", "Temperature, right state (K)", 0.0);
      RP::add("Riemann.Vx1", "Bulk velocity x component, left state (m/s)", 0.0);
      RP::add("Riemann.Vx2", "Bulk velocity x component, right state (m/s)", 0.0);
      RP::add("Riemann.Vy1", "Bulk velocity y component, left state (m/s)", 0.0);
      RP::add("Riemann.Vy2", "Bulk velocity y component, right state (m/s)", 0.0);
      RP::add("Riemann.Vz1", "Bulk velocity z component, left state (m/s)", 0.0);
      RP::add("Riemann.Vz2", "Bulk velocity z component, right state (m/s)", 0.0);
      RP::add("Riemann.Bx1", "Magnetic field x component, left state (T)", 0.0);
      RP::add("Riemann.Bx2", "Magnetic field x component, right state (T)", 0.0);
      RP::add("Riemann.By1", "Magnetic field y component, left state (T)", 0.0);
      RP::add("Riemann.By2", "Magnetic field y component, right state (T)", 0.0);
      RP::add("Riemann.Bz1", "Magnetic field z component, left state (T)", 0.0);
      RP::add("Riemann.Bz2", "Magnetic field z component, right state (T)", 0.0);
   }
 
   void Riemann1::getParameters(){
      Project::getParameters();
      typedef Readparameters RP;
 
      if(getObjectWrapper().particleSpecies.size() > 1) {
         std::cerr << "The selected project does not support multiple particle populations! Aborting in " << __FILE__ << " line " << __LINE__ << std::endl;
         abort();
      }
      RP::get("Riemann.rho1", this->rho[this->LEFT]);
      RP::get("Riemann.rho2", this->rho[this->RIGHT]);
      RP::get("Riemann.T1", this->T[this->LEFT]);
      RP::get("Riemann.T2", this->T[this->RIGHT]);
      RP::get("Riemann.Vx1", this->Vx[this->LEFT]);
      RP::get("Riemann.Vx2", this->Vx[this->RIGHT]);
      RP::get("Riemann.Vy1", this->Vy[this->LEFT]);
      RP::get("Riemann.Vy2", this->Vy[this->RIGHT]);
      RP::get("Riemann.Vz1", this->Vz[this->LEFT]);
      RP::get("Riemann.Vz2", this->Vz[this->RIGHT]);
      RP::get("Riemann.Bx1", this->Bx[this->LEFT]);
      RP::get("Riemann.Bx2", this->Bx[this->RIGHT]);
      RP::get("Riemann.By1", this->By[this->LEFT]);
      RP::get("Riemann.By2", this->By[this->RIGHT]);
      RP::get("Riemann.Bz1", this->Bz[this->LEFT]);
      RP::get("Riemann.Bz2", this->Bz[this->RIGHT]);
   }
 
   Realf Riemann1::fillPhaseSpace(spatial_cell::SpatialCell *cell,
                                       const uint popID,
                                       const uint nRequested
      ) const {
      //const speciesParameters& sP = this->speciesParams[popID];
      // Fetch spatial cell center coordinates
      const Real x  = cell->parameters[CellParams::XCRD] + 0.5*cell->parameters[CellParams::DX];
      // const Real y  = cell->parameters[CellParams::YCRD] + 0.5*cell->parameters[CellParams::DY];
      // const Real z  = cell->parameters[CellParams::ZCRD] + 0.5*cell->parameters[CellParams::DZ];
      cint side = (x < 0.0) ? this->LEFT : this->RIGHT;
 
      const Real mass = getObjectWrapper().particleSpecies[popID].mass;
      Real initRho = this->rho[side];
      Real initT = this->T[side];
      const Real initV0X = this->Vx[side];
      const Real initV0Y = this->Vy[side];
      const Real initV0Z = this->Vz[side];
 
      #ifdef USE_GPU
      vmesh::VelocityMesh *vmesh = cell->dev_get_velocity_mesh(popID);
      vmesh::VelocityBlockContainer* VBC = cell->dev_get_velocity_blocks(popID);
      #else
      vmesh::VelocityMesh *vmesh = cell->get_velocity_mesh(popID);
      vmesh::VelocityBlockContainer* VBC = cell->get_velocity_blocks(popID);
      #endif
      // Loop over blocks
      Realf rhosum = 0;
      arch::parallel_reduce<arch::null>(
         {WID, WID, WID, nRequested},
         ARCH_LOOP_LAMBDA (const uint i, const uint j, const uint k, const uint initIndex, Realf *lsum ) {
            vmesh::GlobalID *GIDlist = vmesh->getGrid()->data();
            Realf* bufferData = VBC->getData();
            const vmesh::GlobalID blockGID = GIDlist[initIndex];
            // Calculate parameters for new block
            Real blockCoords[6];
            vmesh->getBlockInfo(blockGID,&blockCoords[0]);
            creal vxBlock = blockCoords[0];
            creal vyBlock = blockCoords[1];
            creal vzBlock = blockCoords[2];
            creal dvxCell = blockCoords[3];
            creal dvyCell = blockCoords[4];
            creal dvzCell = blockCoords[5];
            ARCH_INNER_BODY(i, j, k, initIndex, lsum) {
               creal vx = vxBlock + (i+0.5)*dvxCell - initV0X;
               creal vy = vyBlock + (j+0.5)*dvyCell - initV0Y;
               creal vz = vzBlock + (k+0.5)*dvzCell - initV0Z;
               const Realf value = MaxwellianPhaseSpaceDensity(vx,vy,vz,initT,initRho,mass);
               bufferData[initIndex*WID3 + k*WID2 + j*WID + i] = value;
               //lsum[0] += value;
            };
         }, rhosum);
      return rhosum;
   }
 
   void Riemann1::calcCellParameters(spatial_cell::SpatialCell* cell,creal& t) { }
 
   void Riemann1::setProjectBField(fsgrids::perbspan perb,
                                   fsgrids::bgbspan bgb,
                                   fsgrids::technicalspan technical, FieldSolverGrid &fsgrid) {
      setBackgroundFieldToZero(fsgrid, technical, bgb);
 
      if(!P::isRestart) {
         // local copies for lambda capture
         const auto Bx_l = this->Bx;
         const auto By_l = this->By;
         const auto Bz_l = this->Bz;
         const auto LEFT_l = this->LEFT;
         const auto RIGHT_l = this->RIGHT;
         
         fsgrid.parallel_for([](int timerId) -> phiprof::Timer { return phiprof::Timer{timerId}; },
                             phiprof::initializeTimer("setProjectBField-loop"), technical,
                             [=](const fsgrid::Coordinates &coordinates, const fsgrid::FsStencil& stencil, cuint sysBoundaryFlag, cuint sysBoundaryLayer) {
            const std::array<Real, 3> xyz = coordinates.getPhysicalCoords(stencil.i, stencil.j, stencil.k);
            auto& cell = perb[stencil.ooo()];
 
            //Real Bxavg, Byavg, Bzavg;
            //Bxavg = Byavg = Bzavg = 0.0;
            cell[fsgrids::bfield::PERBX] = (xyz[0] < 0.0) ? Bx_l[LEFT_l] : Bx_l[RIGHT_l];
            cell[fsgrids::bfield::PERBY] = (xyz[0] < 0.0) ? By_l[LEFT_l] : By_l[RIGHT_l];
            cell[fsgrids::bfield::PERBZ] = (xyz[0] < 0.0) ? Bz_l[LEFT_l] : Bz_l[RIGHT_l];
         });
      }
   }
}