FourierNoise.h

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html

#pragma once

#include "Function.h"

class FEProblemBase;

class FourierNoise : public Function
{
public:
  static InputParameters validParams();

  FourierNoise(const InputParameters & parameters);

  using Function::value;
  virtual Real value(Real, const Point & p) const override;
  virtual ADReal value(const ADReal &, const ADPoint & p) const override;

protected:
  struct SeriesItem
  {
    RealVectorValue k;
    Real s;
    Real c;
  };

  const Real _lambda;

  std::vector<SeriesItem> _series;

  Real _scale;

  FEProblemBase & _fe_problem;
};