SCMQuadPowerIC.C

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#include "SCMQuadPowerIC.h"
#include "Function.h"
#include "QuadSubChannelMesh.h"

using namespace std;
using namespace Eigen;

registerMooseObject("SubChannelApp", SCMQuadPowerIC);
registerMooseObjectRenamed("SubChannelApp", QuadPowerIC, "06/30/2025 24:00", SCMQuadPowerIC);

InputParameters
SCMQuadPowerIC::validParams()
{
  InputParameters params = QuadSubChannelBaseIC::validParams();
  params.addClassDescription("Computes axial heat rate (W/m) that goes into the subchannel cells "
                             "or is assigned to the fuel pins, in a square lattice arrangement");
  // params.addRequiredParam<Real>("power", "The total power of the subassembly [W]");
  params.addRequiredParam<PostprocessorName>(
      "power", "The postprocessor or Real to use for the total power of the subassembly [W]");
  params.addRequiredParam<std::string>(
      "filename", "name of radial power profile .txt file (should be a single column) [UnitLess].");
  params.addParam<FunctionName>(
      "axial_heat_rate",
      "1.0",
      "user provided normalized function of axial heat rate [Unitless]. "
      "The integral over pin heated length should equal the heated length");
  return params;
}

SCMQuadPowerIC::SCMQuadPowerIC(const InputParameters & params)
  : QuadSubChannelBaseIC(params),
    _power(getPostprocessorValue("power")),
    _numberoflines(0),
    _filename(getParam<std::string>("filename")),
    _axial_heat_rate(getFunction("axial_heat_rate"))
{
  auto nx = _mesh.getNx();
  auto ny = _mesh.getNy();
  auto heated_length = _mesh.getHeatedLength();

  _power_dis.resize((ny - 1) * (nx - 1), 1);
  _power_dis.setZero();
  _pin_power_correction.resize((ny - 1) * (nx - 1), 1);
  _pin_power_correction.setOnes();

  Real vin;
  ifstream inFile;

  inFile.open(_filename);
  if (!inFile)
    mooseError(name(), "unable to open file : ", _filename);

  while (inFile >> vin)
    _numberoflines += 1;

  if (inFile.fail() && !inFile.eof())
    mooseError(name(), " non numerical input at line : ", _numberoflines);

  if (_numberoflines != (ny - 1) * (nx - 1))
    mooseError(name(), " Radial profile file doesn't have correct size : ", (ny - 1) * (nx - 1));
  inFile.close();

  inFile.open(_filename);
  int i(0);
  while (inFile >> vin)
  {
    _power_dis(i, 0) = vin;
    i++;
  }
  inFile.close();
  _console << " Power distribution matrix :\n" << _power_dis << " \n";

  auto sum = _power_dis.sum();
  // full (100%) power of one pin [W]
  auto fpin_power = _power / sum;
  // actual pin power [W]
  _ref_power = _power_dis * fpin_power;
  // Convert the actual pin power to a linear heat rate [W/m]
  _ref_qprime = _ref_power / heated_length;
}

void
SCMQuadPowerIC::initialSetup()
{
  auto nx = _mesh.getNx();
  auto ny = _mesh.getNy();
  auto nz = _mesh.getNumOfAxialCells();
  auto z_grid = _mesh.getZGrid();
  auto heated_length = _mesh.getHeatedLength();
  auto unheated_length_entry = _mesh.getHeatedLengthEntry();

  _estimate_power.resize((ny - 1) * (nx - 1), 1);
  _estimate_power.setZero();
  for (unsigned int iz = 1; iz < nz + 1; iz++)
  {
    // Compute the height of this element.
    auto dz = z_grid[iz] - z_grid[iz - 1];
    // Compute axial location of nodes.
    auto z2 = z_grid[iz];
    auto z1 = z_grid[iz - 1];
    Point p1(0, 0, z1 - unheated_length_entry);
    Point p2(0, 0, z2 - unheated_length_entry);
    // cycle through pins to estimate the total power of each pin
    if (z2 > unheated_length_entry && z2 <= unheated_length_entry + heated_length)
    {
      for (unsigned int i_pin = 0; i_pin < (ny - 1) * (nx - 1); i_pin++)
      {
        // use of trapezoidal rule to add to total power of pin
        _estimate_power(i_pin) +=
            _ref_qprime(i_pin) * (_axial_heat_rate.value(_t, p1) + _axial_heat_rate.value(_t, p2)) *
            dz / 2.0;
      }
    }
  }

  // if a Pin has zero power (_ref_qprime(j, i) = 0) then I need to avoid dividing by zero. I
  // divide by a wrong non-zero number which is not correct but this error doesn't mess things cause
  // _ref_qprime(i_pin) = 0.0
  for (unsigned int i_pin = 0; i_pin < (ny - 1) * (nx - 1); i_pin++)
  {
    if (_estimate_power(i_pin) == 0.0)
      _estimate_power(i_pin) = 1.0;
  }
  // We need to correct the linear power assigned to the nodes of each pin
  // so that the total power calculated  by the trapezoidal rule agrees with the power assigned by
  // the user.
  _pin_power_correction = _ref_power.cwiseQuotient(_estimate_power);
}

Real
SCMQuadPowerIC::value(const Point & p)
{
  auto heated_length = _mesh.getHeatedLength();
  auto unheated_length_entry = _mesh.getHeatedLengthEntry();
  Point p1(0, 0, unheated_length_entry);
  Point P = p - p1;
  auto pin_mesh_exist = _mesh.pinMeshExist();

  if (pin_mesh_exist)
  {
    // project axial heat rate on pins
    auto i_pin = _mesh.getPinIndexFromPoint(p);
    {
      if (p(2) >= unheated_length_entry && p(2) <= unheated_length_entry + heated_length)
        return _ref_qprime(i_pin) * _pin_power_correction(i_pin) * _axial_heat_rate.value(_t, P);
      else
        return 0.0;
    }
  }
  else
  {
    // project axial heat rate on subchannels
    auto i_ch = _mesh.getSubchannelIndexFromPoint(p);
    // if we are adjacent to the heated part of the fuel Pin
    if (p(2) >= unheated_length_entry && p(2) <= unheated_length_entry + heated_length)
    {
      auto heat_rate = 0.0;
      for (auto i_pin : _mesh.getChannelPins(i_ch))
      {
        heat_rate += 0.25 * _ref_qprime(i_pin) * _pin_power_correction(i_pin) *
                     _axial_heat_rate.value(_t, P);
      }
      return heat_rate;
    }
    else
      return 0.0;
  }
}