BackwardEulerTimeIntegration.h

// Copyright 2024, UChicago Argonne, LLC
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// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
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#pragma once
 
#include "neml2/tensors/tensors.h"
#include "neml2/models/Model.h"
 
namespace neml2
{
template <typename T>
class BackwardEulerTimeIntegration : public Model
{
public:
  static OptionSet expected_options();
 
  BackwardEulerTimeIntegration(const OptionSet & options);
 
  void diagnose() const override;
 
private:
  const VariableName _var_name;
  const VariableName _var_rate_name;
 
protected:
  void set_value(bool out, bool dout_din, bool d2out_din2) override;

  const Variable<T> & _s;

  const Variable<T> & _sn;

  const Variable<T> & _ds_dt;

  const Variable<Scalar> & _t;

  const Variable<Scalar> & _tn;

  Variable<T> & _r;
};
class BackwardEulerTimeIntegration : public Model {…};
 
typedef BackwardEulerTimeIntegration<Scalar> ScalarBackwardEulerTimeIntegration;
typedef BackwardEulerTimeIntegration<Vec> VecBackwardEulerTimeIntegration;
typedef BackwardEulerTimeIntegration<SR2> SR2BackwardEulerTimeIntegration;
} // namespace neml2