Line data    Source code

       1             : //* This file is part of the MOOSE framework
       2             : //* https://mooseframework.inl.gov
       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             : #pragma once
      11             : 
      12             : #include "DGKernel.h"
      13             : 
      14             : /**
      15             :  * This class can be used to compute a mass matrix for facet unknowns, e.g. for variables that live
      16             :  * only on element faces (these are \p SIDE_HIERARCHIC finite element family variables in libMesh).
      17             :  * This object is only executed on internal faces so in general this object should be paired with
      18             :  * MassMatrixIntegratedBC for external faces. This class cannot be used if performing static
      19             :  * condensation because static condensation relies on computing residuals and Jacobians on a strict
      20             :  * per-element basis whereas DGKernels simultaneously add residuals and Jacobians to both elements
      21             :  * on either side of the face they're currently operating on
      22             :  */
      23             : class MassMatrixDGKernel : public DGKernel
      24             : {
      25             : public:
      26             :   static InputParameters validParams();
      27             : 
      28             :   MassMatrixDGKernel(const InputParameters & parameters);
      29             : 
      30       74600 :   virtual void computeResidual() override {}
      31             : 
      32             : protected:
      33             :   virtual Real computeQpResidual(Moose::DGResidualType) override;
      34             : 
      35             :   virtual Real computeQpJacobian(const Moose::DGJacobianType type) override;
      36             : 
      37             :   const Real _density;
      38             : };