WR2ImplicitExponentialTimeIntegration.h

// Copyright 2023, UChicago Argonne, LLC
// All Rights Reserved
// Software Name: NEML2 -- the New Engineering material Model Library, version 2
// By: Argonne National Laboratory
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#pragma once
 
#include "neml2/models/Model.h"
 
namespace neml2
{
// This function takes as input a skew tensor giving the spin and does the rotational update
class WR2ImplicitExponentialTimeIntegration : public Model
{
public:
  static OptionSet expected_options();
 
  WR2ImplicitExponentialTimeIntegration(const OptionSet & options);
 
private:
  const VariableName _var_name;
 
  const VariableName _var_rate_name;
 
protected:
  void set_value(bool out, bool dout_din, bool d2out_din2) override;
 
  Variable<Vec> & _r;
 
  const Variable<WR2> & _s_dot;
 
  const Variable<Rot> & _s;
 
  const Variable<Rot> & _sn;
 
  const Variable<Scalar> & _t;
 
  const Variable<Scalar> & _tn;
};
} // namespace neml2