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 "TimeIntegrator.h"
      13             : #include "MeshChangedInterface.h"
      14             : 
      15             : #include "libmesh/linear_solver.h"
      16             : #include "libmesh/preconditioner.h"
      17             : #include "libmesh/numeric_vector.h"
      18             : 
      19             : #include "LumpedPreconditioner.h"
      20             : 
      21             : /**
      22             :  * Base class for explicit time integrators that are implemented without using
      23             :  * a nonlinear solver.
      24             :  */
      25             : class ExplicitTimeIntegrator : public TimeIntegrator, public MeshChangedInterface
      26             : {
      27             : public:
      28             :   static InputParameters validParams();
      29             : 
      30             :   ExplicitTimeIntegrator(const InputParameters & parameters);
      31             : 
      32             :   virtual void initialSetup() override;
      33             :   virtual void init() override;
      34             :   virtual void preSolve() override;
      35             :   virtual void meshChanged() override;
      36           0 :   virtual bool isExplicit() const override { return true; }
      37             : 
      38             : protected:
      39             :   enum SolveType
      40             :   {
      41             :     CONSISTENT,
      42             :     LUMPED,
      43             :     LUMP_PRECONDITIONED
      44             :   };
      45             : 
      46             :   /**
      47             :    * Solves a linear system using the chosen solve type
      48             :    *
      49             :    * @param[in] mass_matrix   Mass matrix
      50             :    */
      51             :   virtual bool performExplicitSolve(SparseMatrix<Number> & mass_matrix);
      52             : 
      53             :   /**
      54             :    * Solves a linear system
      55             :    *
      56             :    * @param[in] mass_matrix   Mass matrix
      57             :    */
      58             :   bool solveLinearSystem(SparseMatrix<Number> & mass_matrix);
      59             : 
      60             :   /**
      61             :    * Check for the linear solver convergence
      62             :    */
      63             :   bool checkLinearConvergence();
      64             : 
      65             :   /**
      66             :    * @returns the mass matrix tag ID
      67             :    */
      68         305 :   virtual TagID massMatrixTagID() const { return _Ke_time_tag; }
      69             : 
      70             :   /// Solve type for how mass matrix is handled
      71             :   MooseEnum _solve_type;
      72             : 
      73             :   /// Residual used for the RHS
      74             :   NumericVector<Real> * _explicit_residual;
      75             : 
      76             :   /// Solution vector for the linear solve
      77             :   NumericVector<Real> * _solution_update;
      78             : 
      79             :   /// Diagonal of the lumped mass matrix (and its inversion)
      80             :   NumericVector<Real> * _mass_matrix_diag_inverted;
      81             : 
      82             :   /// Vector of 1's to help with creating the lumped mass matrix
      83             :   NumericVector<Real> * _ones;
      84             : 
      85             :   /// For computing the mass matrix
      86             :   TagID _Ke_time_tag;
      87             : 
      88             :   /// For solving with the consistent matrix
      89             :   std::unique_ptr<libMesh::LinearSolver<Number>> _linear_solver;
      90             : 
      91             :   /// For solving with lumped preconditioning
      92             :   std::unique_ptr<LumpedPreconditioner> _preconditioner;
      93             : 
      94             :   /// Save off current time to reset it back and forth
      95             :   Real _current_time;
      96             : };