Пример #1
0
  static void setVal1(const Box& box, int comps, BaseFab<int>& fab)
    {
      int center = (box.smallEnd()[0] + box.bigEnd()[0])/2;
      fab.setVal(center, 0);
      fab.setVal(2*center, 1);
      fab.setVal(3*center, 2);

    }
Пример #2
0
 static void setVal2(const Box& box, int comps, BaseFab<int>& fab)
   {
     if ( SpaceDim == 1 )
       {
         fab.setVal(173);
       }
     else
       {
         int center = (box.smallEnd()[1] + box.bigEnd()[1])/2;
         fab.setVal(center);
       }
   }
Пример #3
0
template < > int BaseFab<int>::test()
{
  int retbox = testBoxAndComp();
  if (retbox != 0)
    {
      pout() << "testboxandcomp failed" << endl;
      return retbox;
    }

  Box b(IntVect::Zero, IntVect::Unit);
  BaseFab<int> blerg;
  blerg.define(b, 1);
  int val = 4;
  blerg.setVal(val);
  for (BoxIterator bit(b); bit.ok();++bit)
    {
      if (blerg(bit(), 0) != val)
        {
          pout() << "setval or index busted" << endl;
          return -1;
        }
    }

  Box bcop(IntVect::Unit, 2*IntVect::Unit);
  BaseFab<int> bfcopy(bcop, 1);
  bfcopy.setVal(2*val);
  bfcopy.copy(blerg, 0, 0, 1);
  Box binter =bcop;
  binter &= b;
  for (BoxIterator bit(binter); bit.ok();++bit)
    {
      if (bfcopy(bit(), 0) != val)
        {
          pout() << "copy busted" << endl;
          return -2;
        }
    }

  return 0;
}
Пример #4
0
void
AllRegularService::fillGraph(BaseFab<int>&        a_regIrregCovered,
                             Vector<IrregNode>&   a_nodes,
                             const Box&           a_validRegion,
                             const Box&           a_ghostRegion,
                             const ProblemDomain& a_domain,
                             const RealVect&      a_origin,
                             const Real&          a_dx) const
{
    PolyGeom::setVectDx(RealVect::Unit);
    //set all cells to regular
    a_regIrregCovered.setVal(1);
}
Пример #5
0
void
BaseFab<Real>::performCopy (const BaseFab<Real>& src,
                            const Box&           srcbox,
                            int                  srccomp,
                            const Box&           destbox,
                            int                  destcomp,
                            int                  numcomp)
{
    BL_ASSERT(destbox.ok());
    BL_ASSERT(src.box().contains(srcbox));
    BL_ASSERT(box().contains(destbox));
    BL_ASSERT(destbox.sameSize(srcbox));
    BL_ASSERT(srccomp >= 0 && srccomp+numcomp <= src.nComp());
    BL_ASSERT(destcomp >= 0 && destcomp+numcomp <= nComp());

    if (destbox == domain && srcbox == src.box())
    {
        Real*       data_dst = dataPtr(destcomp);
        const Real* data_src = src.dataPtr(srccomp);

        for (long i = 0, N = numcomp*numpts; i < N; i++)
        {
            *data_dst++ = *data_src++;
        }
    }
    else
    {
        const int* destboxlo  = destbox.loVect();
        const int* destboxhi  = destbox.hiVect();
        const int* _th_plo    = loVect();
        const int* _th_phi    = hiVect();
        const int* _x_lo      = srcbox.loVect();
        const int* _x_plo     = src.loVect();
        const int* _x_phi     = src.hiVect();
        Real*       _th_p     = dataPtr(destcomp);
        const Real* _x_p      = src.dataPtr(srccomp);

        FORT_FASTCOPY(_th_p,
                      ARLIM(_th_plo),
                      ARLIM(_th_phi),
                      D_DECL(destboxlo[0],destboxlo[1],destboxlo[2]),
                      D_DECL(destboxhi[0],destboxhi[1],destboxhi[2]),
                      _x_p,
                      ARLIM(_x_plo),
                      ARLIM(_x_phi),
                      D_DECL(_x_lo[0],_x_lo[1],_x_lo[2]),
                      &numcomp);
    }
}
Пример #6
0
// -------------------------------------------------------------
void
Mask::buildMask(BaseFab<int>& a_mask, const ProblemDomain& a_dProblem,
                const BoxLayout& a_grids, const BoxLayout* a_fineGridsPtr,
                int a_nRefFine)
{
  // first set entire box to Physical BC
  a_mask.setVal(maskPhysical);

  // now set all of domain interior to coarse
  Box domainInterior(a_mask.box());
  domainInterior &= a_dProblem;
  a_mask.setVal(maskCoarse,domainInterior,0);

  // now loop over this level's boxes and set them to "copy"
  LayoutIterator lit = a_grids.layoutIterator();

  for (lit.reset(); lit.ok(); ++lit)
    {
      Box intersectBox = a_grids.get(lit());
      intersectBox &= a_mask.box();
      if (!intersectBox.isEmpty())
        {
          a_mask.setVal(maskCopy,intersectBox,0);
        }
    }

  // if finer grids exist, set them to "covered"
  if (a_fineGridsPtr != NULL)
    {
      CH_assert (a_nRefFine > 1);

      LayoutIterator litFine = a_fineGridsPtr->layoutIterator();
      for (litFine.reset(); litFine.ok(); ++litFine)
        {
          Box coarsenedBox(a_fineGridsPtr->get(litFine()));
          coarsenedBox.coarsen(a_nRefFine);
          coarsenedBox &= a_mask.box();
          if (!coarsenedBox.isEmpty())
            {
              a_mask.setVal(maskCovered,coarsenedBox,0);
            }
        }
    }
}
Пример #7
0
void
SlabService::fillGraph(BaseFab<int>&      a_regIrregCovered,
                       Vector<IrregNode>& a_nodes,
                       const Box&         a_validRegion,
                       const Box&         a_ghostRegion,
                       const ProblemDomain&         a_domain,
                       const RealVect&    a_origin,
                       const Real&        a_dx) const
{
  Box grownCovBox = grow(m_coveredRegion, 1);
  grownCovBox &= a_ghostRegion;
  IntVectSet ivsIrreg(grownCovBox);
  ivsIrreg -= m_coveredRegion;
  ivsIrreg &= a_domain;

  //set regirregcoverred flags
  CH_assert(a_regIrregCovered.box().contains(a_ghostRegion));

  //set every cell to regular
  a_regIrregCovered.setVal(1);
  for (BoxIterator bit(a_ghostRegion); bit.ok(); ++bit)
    {
      if (m_coveredRegion.contains(bit()))
        {
          //set covered cells to -1
          a_regIrregCovered(bit(), 0) = -1;
        }
      else if (ivsIrreg.contains(bit()))
        {
          //set irreg cells to 0
          a_regIrregCovered(bit(), 0) = 0;
        }
    }

  //now loop through irreg cells and make Nodes for them
  a_nodes.resize(0);
  for (IVSIterator ivsit(ivsIrreg); ivsit.ok(); ++ivsit)
    {
      const IntVect& iv = ivsit();
      if (a_validRegion.contains(iv))
        {
          IrregNode node;
          //first the obvious
          node.m_cell = iv;
          node.m_volFrac = 1.0;
          node.m_cellIndex = 0;
          node.m_volCentroid    = RealVect::Zero;
          //any time the next cell over is in the covered
          //region, there is no face.  If there is a cell
          //but it is outside the domain, the arc=-1 to signify
          //a boundary face.  Otherwise, the arc is -2 if it
          //is to a regular cell and 0 if it is to an irregular cell
          for (int idir = 0; idir < SpaceDim; idir++)
            {
              for (SideIterator sit; sit.ok(); ++sit)
                {
                  int arcIndex = node.index(idir, sit());
                  Vector<int>&      arcs     = node.m_arc[arcIndex];
                  Vector<Real>&     areaFracs= node.m_areaFrac[arcIndex];
                  Vector<RealVect>& faceCents= node.m_faceCentroid[arcIndex];
                  IntVect otherIV = iv + sign(sit())*BASISV(idir);
                  if (m_coveredRegion.contains(otherIV))
                    {
                      //do nothing, covered face. leave the vector empty
                    }
                  else
                    {
                      int otherCellIndex;
                      if (ivsIrreg.contains(otherIV))
                        {
                          //arc irregular cell inside the domain
                          otherCellIndex = 0;
                        }
                      else if (!a_domain.contains(otherIV))
                        {
                          //boundary face
                          otherCellIndex = -1;
                        }
                      else
                        {
                          //arc to regular cell
                          otherCellIndex = -2;
                        }
                      arcs.push_back(otherCellIndex);
                      Real     areaFrac = 1.0;
                      RealVect faceCent = RealVect::Zero;

                      areaFracs.push_back(areaFrac);
                      faceCents.push_back(faceCent);
                    } //end otherIV not covered
                }
            }
          //the boundary centroid and normal
          //depend on which side is covered

          for (int idir = 0; idir < SpaceDim; idir++)
            {
              for (SideIterator sit; sit.ok(); ++sit)
                {
                  int arcIndex = node.index(idir, sit());
                  Vector<int>& arcs = node.m_arc[arcIndex];
                  if (arcs.size() == 0)
                    {
                      int isign = sign(sit());
                      node.m_bndryCentroid[idir] = Real(isign)*0.5;
                    }
                }
            }
          a_nodes.push_back(node);
        }
    }
}
Пример #8
0
/* ********************************************************************* */
void PatchPluto::updateSolution(FArrayBox&       a_U,
                                FArrayBox&       a_Utmp,
                                const FArrayBox& a_dV,
                                FArrayBox&       split_tags,
                                BaseFab<unsigned char>& a_Flags,
                                FluxBox&         a_F,
                                Time_Step        *Dts,
                                const Box&       UBox, 
                                Grid *grid)
/*
 *
 *
 *
 *
 *********************************************************************** */
{
  CH_assert(isDefined());
  CH_assert(UBox == m_currentBox);

  int nv, in;
  int nxf, nyf, nzf, indf;
  int nxb, nyb, nzb;
  int *i, *j, *k;
  int ii, jj, kk;

  double ***UU[NVAR];
  double *inv_dl, dl2, cylr;
  static Data d;
 #ifdef SKIP_SPLIT_CELLS
  double ***splitcells;
 #endif
 #if (PARABOLIC_FLUX & EXPLICIT)
  static double **dcoeff;
 #endif   
  Index indx;
  static State_1D state;

  Riemann_Solver *Riemann;
  Riemann = rsolver;

#if TIME_STEPPING == RK2 
  double wflux = 0.5;
#else
  double wflux = 1.;
#endif

/* -----------------------------------------------------------------
               Check algorithm compatibilities
   ----------------------------------------------------------------- */

  if (NX1_TOT > NMAX_POINT || NX2_TOT > NMAX_POINT || NX3_TOT > NMAX_POINT){
    print ("!updateSolution (Euler): need to re-allocate matrix\n");
    QUIT_PLUTO(1);
  }

/* -----------------------------------------------------------------
                          Allocate memory
   ----------------------------------------------------------------- */

  #if GEOMETRY != CARTESIAN
   for (nv = 0; nv < NVAR; nv++) a_U.divide(a_dV,0,nv);
   #if CHOMBO_CONS_AM == YES
    #if ROTATING_FRAME == YES
     Box curBox = a_U.box();
     for(BoxIterator bit(curBox); bit.ok(); ++bit) {
       const IntVect& iv = bit();
       a_U(iv,iMPHI) /= a_dV(iv,1);
       a_U(iv,iMPHI) -= a_U(iv,RHO)*a_dV(iv,1)*g_OmegaZ;
     }
    #else
     a_U.divide(a_dV,1,iMPHI);
    #endif
   #endif
  #else
   if (g_stretch_fact != 1.) a_U /= g_stretch_fact; 
  #endif

  for (nv = 0; nv < NVAR; nv++){
    UU[nv] = ArrayMap(NX3_TOT, NX2_TOT, NX1_TOT, a_U.dataPtr(nv));
  }
  #ifdef SKIP_SPLIT_CELLS
   splitcells = ArrayBoxMap(KBEG, KEND, JBEG, JEND, IBEG, IEND,
                            split_tags.dataPtr(0));
  #endif
  #if (TIME_STEPPING == RK2)
   d.flag = ArrayCharMap(NX3_TOT, NX2_TOT, NX1_TOT,a_Flags.dataPtr(0));
  #endif
  #if RESISTIVE_MHD != NO
   if (d.J == NULL) d.J = ARRAY_4D(3,NX3_MAX, NX2_MAX, NX1_MAX, double);
  #endif
 
/* -----------------------------------------------------------
         Allocate static memory areas
   -----------------------------------------------------------  */

  if (state.flux == NULL){

    MakeState (&state);

    nxf = nyf = nzf = 1;
    D_EXPAND(nxf = NMAX_POINT;  ,
/**
   This is called by EBAMRPoissonOp::applyDomainFlux in EBAMRPoissonOp::applyOp
   for reg cells.
   For boundary conditions on velocity in viscous operator.
*/
void InflowOutflowHelmholtzDomainBC::getFaceFlux(BaseFab<Real>&        a_faceFlux,
                                                 const BaseFab<Real>&  a_phi,
                                                 const RealVect&       a_probLo,
                                                 const RealVect&       a_dx,
                                                 const int&            a_idir,
                                                 const Side::LoHiSide& a_side,
                                                 const DataIndex&      a_dit,
                                                 const Real&           a_time,
                                                 const bool&           a_useHomogeneous)
{
  //vel: outflow is neumann. all others dirichlet.  inflow uses inflow vel as the value
  int velcomp =  DirichletPoissonEBBC::s_velComp;
  bool isOutflow =  ((a_side==Side::Hi) && (a_idir==m_flowDir));
  bool isInflow =  ((a_side==Side::Lo) && (a_idir==m_flowDir));
  bool isSlipWall = ((a_idir!=m_flowDir) && (a_idir != velcomp) && ((m_doSlipWallsHi[a_idir]==1 && a_side == Side::Hi)||(m_doSlipWallsLo[a_idir]==1 && a_side == Side::Lo)));
//  bool isVelNeum =  (isOutflow || isSlipWall);

  if (isSlipWall)
    {
      NeumannPoissonDomainBC neumannBC;
      neumannBC.setValue(0.);
      neumannBC.getFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
    }
  else if (isInflow)
    {
      DirichletPoissonDomainBC diriBC;
      if (velcomp==m_flowDir)
        {
          if (!m_doJet1PoiseInflow)
            {
              diriBC.setValue(m_jet1inflowVel);
            }
          else if (m_doJet1PoiseInflow)
            {
              diriBC.setFunction(m_jet1PoiseInflowFunc);
            }
        }
      else
        {
          diriBC.setValue(0.0);
        }

      //basefab flux--EBAMRPoissonOp::applyDomainFlux calls this directly for viscous operator
      if (s_higherOrderHelmBC)
        {
          diriBC.getHigherOrderFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
        }
      else
        {
          diriBC.getFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
        }
    }
  else if (isOutflow)
    {
      if (!m_doJet2)
        {
          NeumannPoissonDomainBC neumannBC;
          neumannBC.setValue(0.);
          neumannBC.getFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
        }
      else if (m_doJet2)
        {
          const RealVect tubeCenter = m_jet2PoiseInflowFunc->getTubeCenter();
          Real tubeRadius = m_jet2PoiseInflowFunc->getTubeRadius();
          CH_assert(a_phi.nComp() == 1);

// start hardwire
          Real wallThickness = 0.075;
          Real bcFactor = 0.5; // % of outflow face to be set to inflow condition
          ParmParse pp;
          pp.get("wall_thickness",wallThickness);
          tubeRadius += wallThickness * bcFactor /2.0;
// end hardwire

          for (int comp=0; comp<a_phi.nComp(); comp++)
            {
              const Box& box = a_faceFlux.box();
              int iside = -1; //a_side == Side::Hi
              BoxIterator bit(box);
              for (bit.begin(); bit.ok(); ++bit)
                {
                  const IntVect& iv = bit();
                  RealVect loc = EBArith::getIVLocation(iv,a_dx,a_probLo);
                  loc[a_idir] -= iside * 0.5 * a_dx[a_idir];//point is now at the face center     
                  CH_assert(loc[m_flowDir] == tubeCenter[m_flowDir]);
                  bool isInsideTube = false;
                  Real radius = m_jet2PoiseInflowFunc->getRadius(loc);
                  if (radius <= tubeRadius)
                    {
                      isInsideTube = true;
                    }
                  if (isInsideTube) // Dirichlet
                    {
                      Real value = 0.0; // takes care of tangential comps
                      if (velcomp == m_flowDir)
                        {
                          if (m_doJet2PoiseInflow)
                            {
                              value = m_jet2PoiseInflowFunc->getVel(radius)[m_flowDir];
                            }
                          else if (!(m_doJet2PoiseInflow))
                            {
                              value = m_jet2inflowVel;
                            }
                        }
                      if (s_higherOrderHelmBC)
                        {
                          IntVect iv1 = bit();
                          Real phi0 = a_phi(iv1,comp);
                          iv1[a_idir] += iside;
                          Real phi1 = a_phi(iv1,comp);
                          iv1[a_idir] -= iside;
                          a_faceFlux(iv,comp) = -iside*(8.0*value + phi1 - 9.0*phi0)/(3.0*a_dx[a_idir]);
                        }
                      else if (!s_higherOrderHelmBC)
                        {
                          Real ihdx = 2.0 / a_dx[a_idir];
                          Real phiVal = a_phi(iv,comp);
                          a_faceFlux(iv,comp) = iside * ihdx * (phiVal - value);
                        }
                    }
                  else if (!isInsideTube) // Neumann
                    {
                      Real value = 0.0;
                      a_faceFlux(iv,comp) = iside * value;
                    }
                }
            } 
        }
    }
  else
    {
      //wall bc no slip
      DirichletPoissonDomainBC diriBC;
      diriBC.setValue(0.0);
      if (s_higherOrderHelmBC)
        {
          diriBC.getHigherOrderFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
        }
      else
        {
          diriBC.getFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
        }
    }
}
//////called by MAC projection solver for domain bc on phi
void InflowOutflowPoissonDomainBC::getFaceFlux(BaseFab<Real>&        a_faceFlux,
                                               const BaseFab<Real>&  a_phi,
                                               const RealVect&       a_probLo,
                                               const RealVect&       a_dx,
                                               const int&            a_idir,
                                               const Side::LoHiSide& a_side,
                                               const DataIndex&      a_dit,
                                               const Real&           a_time,
                                               const bool&           a_useHomogeneous)
{

  //for phi: outflow  dirichlet. inflow neumann
  bool isOutflow= (a_side==Side::Hi) && (a_idir==m_flowDir);
  if (!isOutflow)
    {
      NeumannPoissonDomainBC neumannBC;
      neumannBC.setValue(0.0);
      neumannBC.getFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
    }
  else
    {
      if (!(m_doJet2))
        {
          DirichletPoissonDomainBC diriBC;
          diriBC.setValue(0.0);
          diriBC.getFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
          // diriBC.getHigherOrderFaceFlux(a_faceFlux, a_phi, a_probLo, a_dx, a_idir, a_side, a_dit, a_time, a_useHomogeneous);
        }
      else if (m_doJet2)
        {
          const RealVect tubeCenter = m_jet2PoiseInflowFunc->getTubeCenter();
          Real tubeRadius = m_jet2PoiseInflowFunc->getTubeRadius();

// start hardwire
          Real wallThickness = 0.075;
          Real bcFactor = 0.5; // % of outflow face to be set to inflow condition
          ParmParse pp;
          pp.get("wall_thickness",wallThickness);
          tubeRadius += wallThickness * bcFactor /2.0;
// end hardwire

          CH_assert(a_phi.nComp() == 1);
          for (int comp=0; comp<a_phi.nComp(); comp++)
            {
              const Box& box = a_faceFlux.box();

              int iside = -1; // a_side == Side::Hi in this loop
              Real value = 0.0;
              BoxIterator bit(box);
              for (bit.begin(); bit.ok(); ++bit)
                {
                  const IntVect& iv = bit();
                  RealVect loc = EBArith::getIVLocation(iv,a_dx,a_probLo);
                  loc[a_idir] -= iside * 0.5 * a_dx[a_idir]; //loc is now at the face center
                  CH_assert(loc[m_flowDir] == tubeCenter[m_flowDir]);
                  bool isInsideTube = false;
                  Real radius = m_jet2PoiseInflowFunc->getRadius(loc);
                  if (radius <= tubeRadius)
                    {
                      isInsideTube = true;
                    }
                   if (isInsideTube)
                    {
                      a_faceFlux(iv,comp) = iside * value; //Neumann
                    }
                  else if (!(isInsideTube))
                    {
                      Real ihdx = 2.0 / a_dx[a_idir];
                      Real phiVal = a_phi(iv,comp);
                      a_faceFlux(iv,comp) = iside * ihdx * (phiVal - value); //Dirichlet
                    }
                }
            }
        }
    }
}
Пример #11
0
void
BaseFab<T>::maskLT (BaseFab<int>& mask) const
   {
     mask.setVal(0);
   }
Пример #12
0
void
BaseFab<T>::maskLT (BaseFab<int> & mask)
   {
     mask.dataPtr();
   }
void
NeumannConductivityDomainBC::
getFaceFlux(BaseFab<Real>&        a_faceFlux,
            const BaseFab<Real>&  a_phi,
            const RealVect&       a_probLo,
            const RealVect&       a_dx,
            const int&            a_idir,
            const Side::LoHiSide& a_side,
            const DataIndex&      a_dit,
            const Real&           a_time,
            const bool&           a_useHomogeneous)
{
  CH_TIME("NeumannPoissonDomainBC::getFaceFlux");
  CH_assert(a_phi.nComp() == 1);
  for (int comp=0; comp<a_phi.nComp(); comp++)
    {

      const Box& box = a_faceFlux.box();

      int iside;

      if (a_side == Side::Lo)
        {
          iside = 1;
        }
      else
        {
          iside = -1;
        }

      if (a_useHomogeneous)
        {
          Real value = 0.0;

          a_faceFlux.setVal(iside * value);
        }
      else
        {
          if (m_isFunction)
            {
              BoxIterator bit(box);

              for (bit.begin(); bit.ok(); ++bit)
                {
                  const IntVect& iv = bit();

                  RealVect point = EBArith::getIVLocation(iv,a_dx,a_probLo);
                  point[a_idir] -= iside * 0.5 * a_dx[a_idir];//point is now at the face center

                  RealVect normal = RealVect::Zero;
                  normal[a_idir] = iside;

                  a_faceFlux(iv,comp) = iside * m_flux->value(iv,a_dit,point,normal,a_time,comp);
                }
            }
          else
            {
              if (m_onlyHomogeneous)
                {
                  MayDay::Error("NeumannPoissonDomainBC::getFaceFlux called with undefined inhomogeneous BC");
                }

              Real value = m_value;

              a_faceFlux.setVal(iside * value);
            }
        }
    }

  //again, following the odd convention of EBAMRPoissonOp
  //(because I am reusing its BC classes),
  //the input flux here is CELL centered and the input box
  //is the box adjacent to the domain boundary on the valid side.
  //because I am not insane (yet) I will just shift the flux's box
  //over and multiply by the appropriate coefficient
  a_faceFlux.shiftHalf(a_idir, -sign(a_side));
  const Box& faceBox = a_faceFlux.box();
  const BaseFab<Real>&   regCoef = (*m_bcoef)[a_dit][a_idir].getSingleValuedFAB();
  int  isrc = 0;
  int  idst = 0;
  int  inum = 1;
  FORT_MULTIPLYTWOFAB(CHF_FRA(a_faceFlux),
                      CHF_CONST_FRA(regCoef),
                      CHF_BOX(faceBox),
                      CHF_INT(isrc),CHF_INT(idst),CHF_INT(inum));

  //shift flux back to cell centered land
  a_faceFlux.shiftHalf(a_idir,  sign(a_side));
}