//--------------------------------------------------------------------------
//-------- execute ---------------------------------------------------------
//--------------------------------------------------------------------------
void
ComputeHeatTransferEdgeWallAlgorithm::execute()
{

  stk::mesh::BulkData & bulk_data = realm_.bulk_data();
  stk::mesh::MetaData & meta_data = realm_.meta_data();

  const int nDim = meta_data.spatial_dimension();

  const double dt = realm_.get_time_step();

  // define vector of parent topos; should always be UNITY in size
  std::vector<stk::topology> parentTopo;

  // define some common selectors
  stk::mesh::Selector s_locally_owned_union = meta_data.locally_owned_part()
    &stk::mesh::selectUnion(partVec_);

  stk::mesh::BucketVector const& face_buckets =
    realm_.get_buckets( meta_data.side_rank(), s_locally_owned_union );
  for ( stk::mesh::BucketVector::const_iterator ib = face_buckets.begin();
        ib != face_buckets.end() ; ++ib ) {
    stk::mesh::Bucket & b = **ib ;

    // extract connected element topology
    b.parent_topology(stk::topology::ELEMENT_RANK, parentTopo);
    ThrowAssert ( parentTopo.size() == 1 );
    stk::topology theElemTopo = parentTopo[0];
    MasterElement *meSCS = sierra::nalu::MasterElementRepo::get_surface_master_element(theElemTopo);

    // size some things that are useful
    const int num_face_nodes = b.topology().num_nodes();
    

    const stk::mesh::Bucket::size_type length   = b.size();

    for ( stk::mesh::Bucket::size_type k = 0 ; k < length ; ++k ) {

      // pointer to face data
      const double * areaVec = stk::mesh::field_data(*exposedAreaVec_, b, k);

      // extract the connected element to this exposed face; should be single in size!
      stk::mesh::Entity const * face_elem_rels = b.begin_elements(k);
      ThrowAssert( b.num_elements(k) == 1 );

      // get element; its face ordinal number and populate face_node_ordinals
      stk::mesh::Entity element = face_elem_rels[0];
      const int face_ordinal = b.begin_element_ordinals(k)[0];
      const int *face_node_ordinals = meSCS->side_node_ordinals(face_ordinal);

      // get the relations
      stk::mesh::Entity const * elem_node_rels = bulk_data.begin_nodes(element);

      for ( int ip = 0; ip < num_face_nodes; ++ip ) {

        const int opposingNode = meSCS->opposingNodes(face_ordinal,ip);
        const int nearestNode = face_node_ordinals[ip];

        // left and right nodes; right is on the face; left is the opposing node
        stk::mesh::Entity nodeL = elem_node_rels[opposingNode];
        stk::mesh::Entity nodeR = elem_node_rels[nearestNode];

        // extract nodal fields
        const double * coordL = stk::mesh::field_data(*coordinates_, nodeL );
        const double * coordR = stk::mesh::field_data(*coordinates_, nodeR );

        const double tempL = *stk::mesh::field_data(*temperature_, nodeL );
        const double tempR = *stk::mesh::field_data(*temperature_, nodeR );

        // nearest nodes; gathered and to-be-scattered
        const double * dhdxR    =  stk::mesh::field_data(*dhdx_, nodeR );
        const double densityR   = *stk::mesh::field_data(*density_, nodeR );
        const double thermalCondR = *stk::mesh::field_data(*thermalCond_, nodeR );
        const double specificHeatR = *stk::mesh::field_data(*specificHeat_, nodeR );
        double *assembledWallArea = stk::mesh::field_data(*assembledWallArea_, nodeR);
        double *referenceTemperature = stk::mesh::field_data(*referenceTemperature_, nodeR);
        double *heatTransferCoefficient = stk::mesh::field_data(*heatTransferCoefficient_, nodeR);
        double *normalHeatFlux = stk::mesh::field_data(*normalHeatFlux_, nodeR);
        double *robinCouplingParameter = stk::mesh::field_data(*robinCouplingParameter_, nodeR);

        // offset for bip area vector
        const int faceOffSet = ip*nDim;

        // compute geometry
        double axdx = 0.0;
        double asq = 0.0;
        for ( int j = 0; j < nDim; ++j ) {
          const double axj = areaVec[faceOffSet+j];
          const double dxj = coordR[j] - coordL[j];
          asq += axj*axj;
          axdx += axj*dxj;
        }

        const double inv_axdx = 1.0/axdx;
        const double aMag = std::sqrt(asq);
        const double edgeLen = axdx/aMag;

        // NOC; convert dhdx to dTdx
        double nonOrth = 0.0;
        for ( int j = 0; j < nDim; ++j ) {
          const double axj = areaVec[faceOffSet+j];
          const double dxj = coordR[j] - coordL[j];
          const double kxj = axj - asq*inv_axdx*dxj;
          const double GjT = dhdxR[j]/specificHeatR;
          nonOrth += -thermalCondR*kxj*GjT;
        }

        // compute coupling parameter
        const double chi = densityR * specificHeatR * edgeLen * edgeLen
          / (2 * thermalCondR * dt);
        const double alpha = compute_coupling_parameter(thermalCondR, edgeLen, chi);

        // assemble the nodal quantities; group NOC on reference temp
        // if NOC is < 0; Too will be greater than Tphyscial
        // if NOC is > 0; Too will be less than Tphysical
        // grouping NOC on H reverses the above, however, who knows which is best..
        *assembledWallArea += aMag;
        *referenceTemperature += thermalCondR*tempL*asq*inv_axdx - nonOrth;
        *heatTransferCoefficient += -thermalCondR*tempR*asq*inv_axdx;
        *normalHeatFlux += thermalCondR*(tempL-tempR)*asq*inv_axdx - nonOrth;
        *robinCouplingParameter += alpha*aMag;
      }
    }
  }
}
//--------------------------------------------------------------------------
//-------- execute ---------------------------------------------------------
//--------------------------------------------------------------------------
void
AssembleContinuityNonConformalSolverAlgorithm::execute()
{

  stk::mesh::BulkData & bulk_data = realm_.bulk_data();
  stk::mesh::MetaData & meta_data = realm_.meta_data();

  const int nDim = meta_data.spatial_dimension();

  // continuity equation scales by projection time scale
  const double dt = realm_.get_time_step();
  const double gamma1 = realm_.get_gamma1();
  const double projTimeScale = dt/gamma1;
  
  // deal with interpolation procedure
  const double interpTogether = realm_.get_mdot_interp();
  const double om_interpTogether = 1.0-interpTogether;

  // space for LHS/RHS; nodesPerElem*nodesPerElem and nodesPerElem
  std::vector<double> lhs;
  std::vector<double> rhs;
  std::vector<int> scratchIds;
  std::vector<double> scratchVals;
  std::vector<stk::mesh::Entity> connected_nodes;
 
  // ip values; both boundary and opposing surface
  std::vector<double> currentIsoParCoords(nDim);
  std::vector<double> opposingIsoParCoords(nDim);
  std::vector<double> cNx(nDim);
  std::vector<double> oNx(nDim);
  std::vector<double> currentVelocityBip(nDim);
  std::vector<double> opposingVelocityBip(nDim);
  std::vector<double> currentRhoVelocityBip(nDim);
  std::vector<double> opposingRhoVelocityBip(nDim);
  std::vector<double> currentMeshVelocityBip(nDim);
  std::vector<double> currentRhoMeshVelocityBip(nDim);

  // pressure stabilization
  std::vector<double> currentGjpBip(nDim);
  std::vector<double> opposingGjpBip(nDim);
  std::vector<double> currentDpdxBip(nDim);
  std::vector<double> opposingDpdxBip(nDim);

  // mapping for -1:1 -> -0.5:0.5 volume element
  std::vector<double> currentElementIsoParCoords(nDim);
  std::vector<double> opposingElementIsoParCoords(nDim);

  // interpolate nodal values to point-in-elem
  const int sizeOfScalarField = 1;
  const int sizeOfVectorField = nDim;
 
  // pointers to fixed values
  double *p_cNx = &cNx[0];
  double *p_oNx = &oNx[0];

  // nodal fields to gather; face
  std::vector<double> ws_c_pressure;
  std::vector<double> ws_o_pressure;
  std::vector<double> ws_c_Gjp;
  std::vector<double> ws_o_Gjp;
  std::vector<double> ws_c_velocity;
  std::vector<double> ws_o_velocity;
  std::vector<double> ws_c_meshVelocity; // only require current
  std::vector<double> ws_c_density;
  std::vector<double> ws_o_density;
  std::vector<double> ws_o_coordinates; // only require opposing

  // element
  std::vector<double> ws_c_elem_pressure;
  std::vector<double> ws_o_elem_pressure;
  std::vector<double> ws_c_elem_coordinates;
  std::vector<double> ws_o_elem_coordinates;

  // master element data
  std::vector<double> ws_c_dndx;
  std::vector<double> ws_o_dndx;
  std::vector<double> ws_c_det_j;
  std::vector<double> ws_o_det_j;
  std::vector <double > ws_c_general_shape_function;
  std::vector <double > ws_o_general_shape_function;

  // deal with state
  ScalarFieldType &pressureNp1 = pressure_->field_of_state(stk::mesh::StateNP1);

  // parallel communicate ghosted entities
  if ( NULL != realm_.nonConformalManager_->nonConformalGhosting_ )
    stk::mesh::communicate_field_data(*(realm_.nonConformalManager_->nonConformalGhosting_), ghostFieldVec_);

  // iterate nonConformalManager's dgInfoVec
  std::vector<NonConformalInfo *>::iterator ii;
  for( ii=realm_.nonConformalManager_->nonConformalInfoVec_.begin();
       ii!=realm_.nonConformalManager_->nonConformalInfoVec_.end(); ++ii ) {

    // extract vector of DgInfo
    std::vector<std::vector<DgInfo *> > &dgInfoVec = (*ii)->dgInfoVec_;
    
    std::vector<std::vector<DgInfo*> >::iterator idg;
    for( idg=dgInfoVec.begin(); idg!=dgInfoVec.end(); ++idg ) {

      std::vector<DgInfo *> &faceDgInfoVec = (*idg);

      // now loop over all the DgInfo objects on this particular exposed face
      for ( size_t k = 0; k < faceDgInfoVec.size(); ++k ) {

        DgInfo *dgInfo = faceDgInfoVec[k];

        // extract current/opposing face/element
        stk::mesh::Entity currentFace = dgInfo->currentFace_;
        stk::mesh::Entity opposingFace = dgInfo->opposingFace_;
        stk::mesh::Entity currentElement = dgInfo->currentElement_;
        stk::mesh::Entity opposingElement = dgInfo->opposingElement_;
        const int currentFaceOrdinal = dgInfo->currentFaceOrdinal_;
        const int opposingFaceOrdinal = dgInfo->opposingFaceOrdinal_;

        // master element; face and volume
        MasterElement * meFCCurrent = dgInfo->meFCCurrent_; 
        MasterElement * meFCOpposing = dgInfo->meFCOpposing_;
        MasterElement * meSCSCurrent = dgInfo->meSCSCurrent_; 
        MasterElement * meSCSOpposing = dgInfo->meSCSOpposing_;
        
        // local ip, ordinals, etc
        const int currentGaussPointId = dgInfo->currentGaussPointId_;
        currentIsoParCoords = dgInfo->currentIsoParCoords_;
        opposingIsoParCoords = dgInfo->opposingIsoParCoords_;
        
        // mapping from ip to nodes for this ordinal
        const int *ipNodeMap = meSCSCurrent->ipNodeMap(currentFaceOrdinal);

        // extract some master element info
        const int currentNodesPerFace = meFCCurrent->nodesPerElement_;
        const int opposingNodesPerFace = meFCOpposing->nodesPerElement_;
        const int currentNodesPerElement = meSCSCurrent->nodesPerElement_;
        const int opposingNodesPerElement = meSCSOpposing->nodesPerElement_;

        // resize some things; matrix related
        const int totalNodes = currentNodesPerElement + opposingNodesPerElement;
        const int lhsSize = totalNodes*totalNodes;
        const int rhsSize = totalNodes;
        lhs.resize(lhsSize);
        rhs.resize(rhsSize);
        scratchIds.resize(rhsSize);
        scratchVals.resize(rhsSize);
        connected_nodes.resize(totalNodes);
        
        // algorithm related; face
        ws_c_pressure.resize(currentNodesPerFace);
        ws_o_pressure.resize(opposingNodesPerFace);
        ws_c_Gjp.resize(currentNodesPerFace*nDim);
        ws_o_Gjp.resize(opposingNodesPerFace*nDim);
        ws_c_velocity.resize(currentNodesPerFace*nDim);
        ws_o_velocity.resize(opposingNodesPerFace*nDim);
        ws_c_meshVelocity.resize(currentNodesPerFace*nDim);
        ws_c_density.resize(currentNodesPerFace);
        ws_o_density.resize(opposingNodesPerFace);
        ws_o_coordinates.resize(opposingNodesPerFace*nDim);
        ws_c_general_shape_function.resize(currentNodesPerFace);
        ws_o_general_shape_function.resize(opposingNodesPerFace);
        
        // algorithm related; element; dndx will be at a single gauss point
        ws_c_elem_pressure.resize(currentNodesPerElement);
        ws_o_elem_pressure.resize(opposingNodesPerElement);
        ws_c_elem_coordinates.resize(currentNodesPerElement*nDim);
        ws_o_elem_coordinates.resize(opposingNodesPerElement*nDim);
        ws_c_dndx.resize(nDim*currentNodesPerElement);
        ws_o_dndx.resize(nDim*opposingNodesPerElement);
        ws_c_det_j.resize(1);
        ws_o_det_j.resize(1);

        // pointers
        double *p_lhs = &lhs[0];
        double *p_rhs = &rhs[0];
        
        // face
        double *p_c_pressure = &ws_c_pressure[0];
        double *p_o_pressure = &ws_o_pressure[0];
        double *p_c_Gjp = &ws_c_Gjp[0];
        double *p_o_Gjp = &ws_o_Gjp[0];
        double *p_c_velocity = &ws_c_velocity[0];
        double *p_o_velocity= &ws_o_velocity[0];
        double *p_c_meshVelocity = &ws_c_meshVelocity[0];
        double *p_c_density = &ws_c_density[0];
        double *p_o_density = &ws_o_density[0];
        double *p_o_coordinates = &ws_o_coordinates[0];

        // element
        double *p_c_elem_pressure = &ws_c_elem_pressure[0];
        double *p_o_elem_pressure = &ws_o_elem_pressure[0];
        double *p_c_elem_coordinates = &ws_c_elem_coordinates[0];
        double *p_o_elem_coordinates = &ws_o_elem_coordinates[0];

        // me pointers
        double *p_c_general_shape_function = &ws_c_general_shape_function[0];
        double *p_o_general_shape_function = &ws_o_general_shape_function[0];
        double *p_c_dndx = &ws_c_dndx[0];
        double *p_o_dndx = &ws_o_dndx[0];
        
        // populate current face_node_ordinals
        const int *c_face_node_ordinals = meSCSCurrent->side_node_ordinals(currentFaceOrdinal);

        // gather current face data
        stk::mesh::Entity const* current_face_node_rels = bulk_data.begin_nodes(currentFace);
        const int current_num_face_nodes = bulk_data.num_nodes(currentFace);
        for ( int ni = 0; ni < current_num_face_nodes; ++ni ) {
          stk::mesh::Entity node = current_face_node_rels[ni];          
          // gather; scalar
          p_c_pressure[ni] = *stk::mesh::field_data(pressureNp1, node);
          p_c_density[ni] = *stk::mesh::field_data(*density_, node);
          // gather; vector
          const double *velocity = stk::mesh::field_data(*velocity_, node );
          const double *meshVelocity = stk::mesh::field_data(*meshVelocity_, node );
          const double *Gjp = stk::mesh::field_data(*Gjp_, node );
          for ( int i = 0; i < nDim; ++i ) {
            const int offSet = i*current_num_face_nodes + ni; 
            p_c_velocity[offSet] = velocity[i];
            p_c_meshVelocity[offSet] = meshVelocity[i];
            p_c_Gjp[offSet] = Gjp[i];
          }
        }
      
        // populate opposing face_node_ordinals
        const int *o_face_node_ordinals = meSCSOpposing->side_node_ordinals(opposingFaceOrdinal);

        // gather opposing face data
        stk::mesh::Entity const* opposing_face_node_rels = bulk_data.begin_nodes(opposingFace);
        const int opposing_num_face_nodes = bulk_data.num_nodes(opposingFace);
        for ( int ni = 0; ni < opposing_num_face_nodes; ++ni ) {
          stk::mesh::Entity node = opposing_face_node_rels[ni];
          // gather; scalar
          p_o_pressure[ni] = *stk::mesh::field_data(pressureNp1, node);
          p_o_density[ni] = *stk::mesh::field_data(*density_, node);
          // gather; vector
          const double *velocity = stk::mesh::field_data(*velocity_, node );
          const double *Gjp = stk::mesh::field_data(*Gjp_, node );
          const double *coords = stk::mesh::field_data(*coordinates_, node);
          for ( int i = 0; i < nDim; ++i ) {
            const int offSet = i*opposing_num_face_nodes + ni;        
            p_o_velocity[offSet] = velocity[i];
            p_o_Gjp[offSet] = Gjp[i];
            p_o_coordinates[ni*nDim+i] = coords[i];
          }
        }
        
        // gather current element data
        stk::mesh::Entity const* current_elem_node_rels = bulk_data.begin_nodes(currentElement);
        const int current_num_elem_nodes = bulk_data.num_nodes(currentElement);
        for ( int ni = 0; ni < current_num_elem_nodes; ++ni ) {
          stk::mesh::Entity node = current_elem_node_rels[ni];          
          // set connected nodes
          connected_nodes[ni] = node;
          // gather; scalar
          p_c_elem_pressure[ni] = *stk::mesh::field_data(pressureNp1, node);
          // gather; vector
          const double *coords = stk::mesh::field_data(*coordinates_, node);
          const int niNdim = ni*nDim;
          for ( int i = 0; i < nDim; ++i ) {
            p_c_elem_coordinates[niNdim+i] = coords[i];
          }
        }

        // gather opposing element data; sneak in second connected nodes
        stk::mesh::Entity const* opposing_elem_node_rels = bulk_data.begin_nodes(opposingElement);
        const int opposing_num_elem_nodes = bulk_data.num_nodes(opposingElement);
        for ( int ni = 0; ni < opposing_num_elem_nodes; ++ni ) {
          stk::mesh::Entity node = opposing_elem_node_rels[ni];
          // set connected nodes
          connected_nodes[ni+current_num_elem_nodes] = node;
          // gather; scalar
          p_o_elem_pressure[ni] = *stk::mesh::field_data(pressureNp1, node);
          // gather; vector
          const double *coords = stk::mesh::field_data(*coordinates_, node);
          const int niNdim = ni*nDim;
          for ( int i = 0; i < nDim; ++i ) {
            p_o_elem_coordinates[niNdim+i] = coords[i];
          }
        }
        
        // compute opposing normal through master element call, not using oppoing exposed area
        meFCOpposing->general_normal(&opposingIsoParCoords[0], &p_o_coordinates[0], &p_oNx[0]);
        
        // pointer to face data
        const double * c_areaVec = stk::mesh::field_data(*exposedAreaVec_, currentFace);
        
        double c_amag = 0.0;
        for ( int j = 0; j < nDim; ++j ) {
          const double c_axj = c_areaVec[currentGaussPointId*nDim+j];
          c_amag += c_axj*c_axj;
        }
        c_amag = std::sqrt(c_amag);

        // now compute normal
        for ( int i = 0; i < nDim; ++i ) {
          p_cNx[i] = c_areaVec[currentGaussPointId*nDim+i]/c_amag;
        }

        // override opposing normal
        if ( useCurrentNormal_ ) {
          for ( int i = 0; i < nDim; ++i )
            p_oNx[i] = -p_cNx[i];
        }

        // project from side to element; method deals with the -1:1 isInElement range to the proper underlying CVFEM range
        meSCSCurrent->sidePcoords_to_elemPcoords(currentFaceOrdinal, 1, &currentIsoParCoords[0], &currentElementIsoParCoords[0]);
        meSCSOpposing->sidePcoords_to_elemPcoords(opposingFaceOrdinal, 1, &opposingIsoParCoords[0], &opposingElementIsoParCoords[0]);
        
        // compute dndx
        double scs_error = 0.0;
        meSCSCurrent->general_face_grad_op(currentFaceOrdinal, &currentElementIsoParCoords[0], 
                                           &p_c_elem_coordinates[0], &p_c_dndx[0], &ws_c_det_j[0], &scs_error);
        meSCSOpposing->general_face_grad_op(opposingFaceOrdinal, &opposingElementIsoParCoords[0], 
                                            &p_o_elem_coordinates[0], &p_o_dndx[0], &ws_o_det_j[0], &scs_error);
        
        // current inverse length scale; can loop over face nodes to avoid "nodesOnFace" array
        double currentInverseLength = 0.0;
        for ( int ic = 0; ic < current_num_face_nodes; ++ic ) {
          const int faceNodeNumber = c_face_node_ordinals[ic];
          const int offSetDnDx = faceNodeNumber*nDim; // single intg. point
          for ( int j = 0; j < nDim; ++j ) {
            const double nxj = p_cNx[j];
            const double dndxj = p_c_dndx[offSetDnDx+j];
            currentInverseLength += dndxj*nxj;
          }
        }

        // opposing inverse length scale; can loop over face nodes to avoid "nodesOnFace" array
        double opposingInverseLength = 0.0;
        for ( int ic = 0; ic < opposing_num_face_nodes; ++ic ) {
          const int faceNodeNumber = o_face_node_ordinals[ic];
          const int offSetDnDx = faceNodeNumber*nDim; // single intg. point
          for ( int j = 0; j < nDim; ++j ) {
            const double nxj = p_oNx[j];
            const double dndxj = p_o_dndx[offSetDnDx+j];
            opposingInverseLength += dndxj*nxj;
          }
        }

        // projected nodal gradient; zero out
        for ( int j = 0; j < nDim; ++j ) {
          currentDpdxBip[j] = 0.0;
          opposingDpdxBip[j] = 0.0;
        }

        // current pressure gradient
        for ( int ic = 0; ic < currentNodesPerElement; ++ic ) {
          const int offSetDnDx = ic*nDim; // single intg. point
          const double pNp1 = p_c_elem_pressure[ic];
          for ( int j = 0; j < nDim; ++j ) {
            const double dndxj = p_c_dndx[offSetDnDx+j];
            currentDpdxBip[j] += dndxj*pNp1;
          }
        }

        // opposing pressure gradient
        for ( int ic = 0; ic < opposingNodesPerElement; ++ic ) {
          const int offSetDnDx = ic*nDim; // single intg. point
          const double pNp1 = p_o_elem_pressure[ic];
          for ( int j = 0; j < nDim; ++j ) {
            const double dndxj = p_o_dndx[offSetDnDx+j];
            opposingDpdxBip[j] += dndxj*pNp1;
          }
        }

        // interpolate to boundary ips
        double currentPressureBip = 0.0;
        meFCCurrent->interpolatePoint(
          sizeOfScalarField,
          &(dgInfo->currentIsoParCoords_[0]),
          &ws_c_pressure[0],
          &currentPressureBip);
        
        double opposingPressureBip = 0.0;
        meFCOpposing->interpolatePoint(
          sizeOfScalarField,
          &(dgInfo->opposingIsoParCoords_[0]),
          &ws_o_pressure[0],
          &opposingPressureBip);

        // velocity
        meFCCurrent->interpolatePoint(
          sizeOfVectorField,
          &(dgInfo->currentIsoParCoords_[0]),
          &ws_c_velocity[0],
          &currentVelocityBip[0]);

        meFCOpposing->interpolatePoint(
          sizeOfVectorField,
          &(dgInfo->opposingIsoParCoords_[0]),
          &ws_o_velocity[0],
          &opposingVelocityBip[0]);

        // mesh velocity; only required at current
        meFCCurrent->interpolatePoint(
          sizeOfVectorField,
          &(dgInfo->currentIsoParCoords_[0]),
          &ws_c_meshVelocity[0],
          &currentMeshVelocityBip[0]);
        
        // projected nodal gradient
        meFCCurrent->interpolatePoint(
          sizeOfVectorField,
          &(dgInfo->currentIsoParCoords_[0]),
          &ws_c_Gjp[0],
          &currentGjpBip[0]);
        
        meFCOpposing->interpolatePoint(
          sizeOfVectorField,
          &(dgInfo->opposingIsoParCoords_[0]),
          &ws_o_Gjp[0],
          &opposingGjpBip[0]);

        // density
        double currentDensityBip = 0.0;
        meFCCurrent->interpolatePoint(
          sizeOfScalarField,
          &(dgInfo->currentIsoParCoords_[0]),
          &ws_c_density[0],
          &currentDensityBip);
        
        double opposingDensityBip = 0.0;
        meFCOpposing->interpolatePoint(
          sizeOfScalarField,
          &(dgInfo->opposingIsoParCoords_[0]),
          &ws_o_density[0],
          &opposingDensityBip);

        // product of density and velocity; current (take over previous nodal value for velocity)
        for ( int ni = 0; ni < current_num_face_nodes; ++ni ) {
          const double density = p_c_density[ni];
          for ( int i = 0; i < nDim; ++i ) {
            const int offSet = i*current_num_face_nodes + ni;        
            p_c_velocity[offSet] *= density;
            p_c_meshVelocity[offSet] *= density;
          }
        }

        // opposite
        for ( int ni = 0; ni < opposing_num_face_nodes; ++ni ) {
          const double density = p_o_density[ni];
          for ( int i = 0; i < nDim; ++i ) {
            const int offSet = i*opposing_num_face_nodes + ni;        
            p_o_velocity[offSet] *= density;
          }
        }

        // interpolate velocity with density scaling
        meFCCurrent->interpolatePoint(
          sizeOfVectorField,
          &(dgInfo->currentIsoParCoords_[0]),
          &ws_c_velocity[0],
          &currentRhoVelocityBip[0]);
        
        meFCOpposing->interpolatePoint(
          sizeOfVectorField,
          &(dgInfo->opposingIsoParCoords_[0]),
          &ws_o_velocity[0],
          &opposingRhoVelocityBip[0]);

        // interpolate mesh velocity with density scaling; only current
        meFCCurrent->interpolatePoint(
          sizeOfVectorField,
          &(dgInfo->currentIsoParCoords_[0]),
          &ws_c_meshVelocity[0],
          &currentRhoMeshVelocityBip[0]);

        // zero lhs/rhs
        for ( int p = 0; p < lhsSize; ++p )
          p_lhs[p] = 0.0;
        for ( int p = 0; p < rhsSize; ++p )
          p_rhs[p] = 0.0;
                
        const double penaltyIp = projTimeScale*0.5*(currentInverseLength + opposingInverseLength);

        double ncFlux = 0.0;
        double ncPstabFlux = 0.0;
        for ( int j = 0; j < nDim; ++j ) {
          const double cRhoVelocity = interpTogether*currentRhoVelocityBip[j] + om_interpTogether*currentDensityBip*currentVelocityBip[j];
          const double oRhoVelocity = interpTogether*opposingRhoVelocityBip[j] + om_interpTogether*opposingDensityBip*opposingVelocityBip[j];
          const double cRhoMeshVelocity = interpTogether*currentRhoMeshVelocityBip[j] + om_interpTogether*currentDensityBip*currentMeshVelocityBip[j];
          ncFlux += 0.5*(cRhoVelocity*p_cNx[j] - oRhoVelocity*p_oNx[j]) - meshMotionFac_*cRhoMeshVelocity*p_cNx[j];
          const double cPstab = currentDpdxBip[j] - currentGjpBip[j];
          const double oPstab = opposingDpdxBip[j] - opposingGjpBip[j];
          ncPstabFlux += 0.5*(cPstab*p_cNx[j] - oPstab*p_oNx[j]);
        }

        const double mdot = (ncFlux - includePstab_*projTimeScale*ncPstabFlux + penaltyIp*(currentPressureBip - opposingPressureBip))*c_amag;
        
        // form residual
        const int nn = ipNodeMap[currentGaussPointId];
        p_rhs[nn] -= mdot/projTimeScale;

        // set-up row for matrix
        const int rowR = nn*totalNodes;
        double lhsFac = penaltyIp*c_amag/projTimeScale;
        
        // sensitivities; current face (penalty); use general shape function for this single ip
        meFCCurrent->general_shape_fcn(1, &currentIsoParCoords[0], &ws_c_general_shape_function[0]);
        for ( int ic = 0; ic < currentNodesPerFace; ++ic ) {
          const int icnn = c_face_node_ordinals[ic];
          const double r = p_c_general_shape_function[ic];
          p_lhs[rowR+icnn] += r*lhsFac;
        }
        
        // sensitivities; current element (diffusion)
        for ( int ic = 0; ic < currentNodesPerElement; ++ic ) {
          const int offSetDnDx = ic*nDim; // single intg. point
          double lhscd = 0.0;
          for ( int j = 0; j < nDim; ++j ) {
            const double nxj = p_cNx[j];
            const double dndxj = p_c_dndx[offSetDnDx+j];
            lhscd -= dndxj*nxj;
          }
          p_lhs[rowR+ic] += 0.5*lhscd*c_amag*includePstab_;
        }

        // sensitivities; opposing face (penalty); use general shape function for this single ip
        meFCOpposing->general_shape_fcn(1, &opposingIsoParCoords[0], &ws_o_general_shape_function[0]);
        for ( int ic = 0; ic < opposingNodesPerFace; ++ic ) {
          const int icnn = o_face_node_ordinals[ic];
          const double r = p_o_general_shape_function[ic];
          p_lhs[rowR+icnn+currentNodesPerElement] -= r*lhsFac;
        }
        
        // sensitivities; opposing element (diffusion)
        for ( int ic = 0; ic < opposingNodesPerElement; ++ic ) {
          const int offSetDnDx = ic*nDim; // single intg. point
          double lhscd = 0.0;
          for ( int j = 0; j < nDim; ++j ) {
            const double nxj = p_oNx[j];
            const double dndxj = p_o_dndx[offSetDnDx+j];
            lhscd -= dndxj*nxj;
          }
          p_lhs[rowR+ic+currentNodesPerElement] -= 0.5*lhscd*c_amag*includePstab_;
        }

        apply_coeff(connected_nodes, scratchIds, scratchVals, rhs, lhs, __FILE__);
      }
    }
  }
}