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 "ExplicitRK2.h"
      13             : 
      14             : /**
      15             :  * Ralston's time integration method.
      16             :  *
      17             :  * The Butcher tableau for this method is:
      18             :  * 0   | 0
      19             :  * 2/3 | 2/3    0
      20             :  * ---------------------
      21             :  *     | 1/4  3/4
      22             :  *
      23             :  * See: ExplicitRK2.h for more information.
      24             :  */
      25             : class Ralston : public ExplicitRK2
      26             : {
      27             : public:
      28             :   static InputParameters validParams();
      29             : 
      30             :   Ralston(const InputParameters & parameters);
      31             : 
      32             : protected:
      33             :   /// Method coefficient overrides
      34        1432 :   virtual Real a() const { return 2. / 3.; }
      35         792 :   virtual Real b1() const { return .25; }
      36         792 :   virtual Real b2() const { return .75; }
      37             : };