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DivField.C
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DivField.C
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//* This file is part of the MOOSE framework
//* https://www.mooseframework.org
//*
//* 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 "DivField.h"
#include "Assembly.h"
registerMooseObject("ElectromagneticsApp", DivField);
InputParameters
DivField::validParams()
{
InputParameters params = Kernel::validParams();
params.addClassDescription("Weak form term for $\\nabla \\cdot \\vec{u}$.");
params.addRequiredCoupledVar("u", "vector field");
return params;
}
DivField::DivField(const InputParameters & parameters)
: Kernel(parameters),
_u_var(*getVectorVar("u", 0)),
_div_phi(_assembly.divPhi(_u_var)),
_div_u(_u_var.divSln()),
_u_var_num(coupled("u"))
{
}
Real
DivField::computeQpResidual()
{
return _div_u[_qp] * _test[_i][_qp];
}
Real
DivField::computeQpOffDiagJacobian(unsigned int jvar)
{
if (_u_var_num == jvar)
return _div_phi[_j][_qp] * _test[_i][_qp];
return 0.0;
}