FVScalarLagrangeMultiplierConstraint.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 "FVElementalKernel.h"

class FVScalarLagrangeMultiplierConstraint : public FVElementalKernel
{
public:
  static InputParameters validParams();

  FVScalarLagrangeMultiplierConstraint(const InputParameters & parameters);

  const MooseVariableScalar & lambdaVariable() const { return _lambda_var; }

protected:
  const PostprocessorValue & _phi0;

private:
  void computeResidual() override final;
  void computeJacobian() override final;
  using FVElementalKernel::computeOffDiagJacobian;
  void computeOffDiagJacobian() override final;
  void computeResidualAndJacobian() override final;
  ADReal computeQpResidual() override = 0;

  const MooseVariableScalar & _lambda_var;

  const ADVariableValue & _lambda;
};