Line data    Source code

       1             : //* This file is part of the MOOSE framework
       2             : //* https://www.mooseframework.org
       3             : //*
       4             : //* All rights reserved, see COPYRIGHT for full restrictions
       5             : //* https://github.com/idaholab/moose/blob/master/COPYRIGHT
       6             : //*
       7             : //* Licensed under LGPL 2.1, please see LICENSE for details
       8             : //* https://www.gnu.org/licenses/lgpl-2.1.html
       9             : 
      10             : #include "NewmarkAccelAux.h"
      11             : 
      12             : registerMooseObject("TensorMechanicsApp", NewmarkAccelAux);
      13             : 
      14             : InputParameters
      15         880 : NewmarkAccelAux::validParams()
      16             : {
      17         880 :   InputParameters params = AuxKernel::validParams();
      18         880 :   params.addClassDescription("Computes the current acceleration using the Newmark method.");
      19        1760 :   params.addRequiredCoupledVar("displacement", "displacement variable");
      20        1760 :   params.addRequiredCoupledVar("velocity", "velocity variable");
      21        1760 :   params.addRequiredParam<Real>("beta", "beta parameter for Newmark method");
      22         880 :   return params;
      23           0 : }
      24             : 
      25         465 : NewmarkAccelAux::NewmarkAccelAux(const InputParameters & parameters)
      26             :   : AuxKernel(parameters),
      27         465 :     _disp_old(coupledValueOld("displacement")),
      28         465 :     _disp(coupledValue("displacement")),
      29         465 :     _vel_old(coupledValueOld("velocity")),
      30         465 :     _u_old(uOld()),
      31        1395 :     _beta(getParam<Real>("beta"))
      32             : {
      33         465 : }
      34             : 
      35             : Real
      36      312076 : NewmarkAccelAux::computeValue()
      37             : {
      38      312076 :   if (!isNodal())
      39           0 :     mooseError("must run on a nodal variable");
      40             : 
      41      312076 :   Real accel_old = _u_old[_qp];
      42      312076 :   if (_dt == 0)
      43             :     return accel_old;
      44             : 
      45             :   // Calculates acceeleration using Newmark time integration method
      46      312076 :   return 1.0 / _beta *
      47      312076 :          ((_disp[_qp] - _disp_old[_qp]) / (_dt * _dt) - _vel_old[_qp] / _dt -
      48      312076 :           accel_old * (0.5 - _beta));
      49             : }