forked from idaholab/moose
/
GradField.C
47 lines (40 loc) · 1.11 KB
/
GradField.C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
//* 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 "GradField.h"
#include "Assembly.h"
registerMooseObject("ElectromagneticsApp", GradField);
InputParameters
GradField::validParams()
{
InputParameters params = VectorKernel::validParams();
params.addClassDescription("Weak form term for $-\\nabla p$.");
params.addRequiredCoupledVar("p", "scalar field");
return params;
}
GradField::GradField(const InputParameters & parameters)
: VectorKernel(parameters),
_p(coupledValue("p")),
_p_var(*getVar("p", 0)),
_p_phi(_assembly.phi(_p_var)),
_div_test(_var.divPhi()),
_p_var_num(coupled("p"))
{
}
Real
GradField::computeQpResidual()
{
return _p[_qp] * _div_test[_i][_qp];
}
Real
GradField::computeQpOffDiagJacobian(unsigned int jvar)
{
if (_p_var_num == jvar)
return _p_phi[_j][_qp] * _div_test[_i][_qp];
return 0.0;
}