VectorKernel.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 "VectorKernel.h"
#include "Assembly.h"
#include "MooseVariableFE.h"
#include "MooseVariableScalar.h"
#include "SubProblem.h"
#include "NonlinearSystem.h"

#include "libmesh/threads.h"
#include "libmesh/quadrature.h"

InputParameters
VectorKernel::validParams()
{
  InputParameters params = KernelBase::validParams();
  params.registerBase("VectorKernel");
  return params;
}

VectorKernel::VectorKernel(const InputParameters & parameters)
  : KernelBase(parameters),
    MooseVariableInterface<RealVectorValue>(this,
                                            false,
                                            "variable",
                                            Moose::VarKindType::VAR_SOLVER,
                                            Moose::VarFieldType::VAR_FIELD_VECTOR),
    _var(*mooseVariable()),
    _test(_var.phi()),
    _grad_test(_var.gradPhi()),
    _phi(_assembly.phi(_var)),
    _grad_phi(_assembly.gradPhi(_var)),
    _u(_is_implicit ? _var.sln() : _var.slnOld()),
    _grad_u(_is_implicit ? _var.gradSln() : _var.gradSlnOld())
{
  addMooseVariableDependency(mooseVariable());
}

void
VectorKernel::computeResidual()
{
  prepareVectorTag(_assembly, _var.number());
  precalculateResidual();
  for (_i = 0; _i < _test.size(); _i++)
    for (_qp = 0; _qp < _qrule->n_points(); _qp++)
    {
      Real residual = _JxW[_qp] * _coord[_qp] * computeQpResidual();
      _local_re(_i) += residual;
    }
  accumulateTaggedLocalResidual();

  if (_has_save_in)
    for (const auto & var : _save_in)
      var->sys().solution().add_vector(_local_re, var->dofIndices());
}

void
VectorKernel::computeJacobian()
{
  prepareMatrixTag(_assembly, _var.number(), _var.number());
  precalculateJacobian();
  for (_i = 0; _i < _test.size(); _i++)
    for (_j = 0; _j < _phi.size(); _j++)
      for (_qp = 0; _qp < _qrule->n_points(); _qp++)
        _local_ke(_i, _j) += _JxW[_qp] * _coord[_qp] * computeQpJacobian();
  accumulateTaggedLocalMatrix();

  if (_has_diag_save_in && !_sys.computingScalingJacobian())
  {
    unsigned int rows = _local_ke.m();
    DenseVector<Number> diag(rows);
    for (unsigned int i = 0; i < rows; i++)
      diag(i) = _local_ke(i, i);

    for (const auto & var : _diag_save_in)
      var->sys().solution().add_vector(diag, var->dofIndices());
  }
}

void
VectorKernel::computeOffDiagJacobian(const unsigned int jvar_num)
{
  if (jvar_num == _var.number())
    computeJacobian();
  else
  {
    const auto & jvar = getVariable(jvar_num);

    prepareMatrixTag(_assembly, _var.number(), jvar_num);

    // This (undisplaced) jvar could potentially yield the wrong phi size if this object is acting
    // on the displaced mesh
    const auto phi_size = jvar.dofIndices().size();

    precalculateOffDiagJacobian(jvar_num);
    for (_i = 0; _i < _test.size(); _i++)
      for (_j = 0; _j < phi_size; _j++)
        for (_qp = 0; _qp < _qrule->n_points(); _qp++)
          _local_ke(_i, _j) += _JxW[_qp] * _coord[_qp] * computeQpOffDiagJacobian(jvar_num);

    accumulateTaggedLocalMatrix();
  }
}

void
VectorKernel::computeOffDiagJacobianScalar(unsigned int jvar)
{
  prepareMatrixTag(_assembly, _var.number(), jvar);
  MooseVariableScalar & jv = _sys.getScalarVariable(_tid, jvar);

  for (_i = 0; _i < _test.size(); _i++)
    for (_j = 0; _j < jv.order(); _j++)
      for (_qp = 0; _qp < _qrule->n_points(); _qp++)
        _local_ke(_i, _j) += _JxW[_qp] * _coord[_qp] * computeQpOffDiagJacobianScalar(jvar);
  accumulateTaggedLocalMatrix();
}