ADPhaseFieldTwoPhaseSurfaceTension.C

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
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//* 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 "ADPhaseFieldTwoPhaseSurfaceTension.h"
 
registerMooseObject("PhaseFieldApp", ADPhaseFieldTwoPhaseSurfaceTension);
 
InputParameters
ADPhaseFieldTwoPhaseSurfaceTension::validParams()
{
  InputParameters params = ADKernelValue::validParams();
  params.addClassDescription("Phase field surface tension force for the Navier-Stokes equations.");
  params.addRequiredCoupledVar("auxpf", "Auxillary variable in phase field formulation");
  params.addRequiredCoupledVar("pf", "phase field variable");
  params.addRequiredParam<Real>("coeff", "prefactor relating chemical potential and psi");
  return params;
}
 
ADPhaseFieldTwoPhaseSurfaceTension::ADPhaseFieldTwoPhaseSurfaceTension(
    const InputParameters & parameters)
  : ADVectorKernelValue(parameters),
    _auxpf(adCoupledValue("auxpf")),
    _grad_pf(adCoupledGradient("pf")),
    _coeff(getParam<Real>("coeff"))
{
}
 
ADRealVectorValue
ADPhaseFieldTwoPhaseSurfaceTension::precomputeQpResidual()
{
  return -_coeff * _auxpf[_qp] * _grad_pf[_qp];
}