backwardEuler.hpp

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// SPDX-FileCopyrightText: 2023 - 2026 NeoN authors
//
// SPDX-License-Identifier: MIT
 
#pragma once
 
#include "NeoN/core/database/fieldCollection.hpp"
#include "NeoN/core/database/oldTimeCollection.hpp"
#include "NeoN/fields/field.hpp"
#include "NeoN/timeIntegration/timeIntegration.hpp"
#include "NeoN/dsl/solver.hpp"
 
namespace NeoN::timeIntegration
{
 
namespace fvcc = NeoN::finiteVolume::cellCentred;
 
template<typename SolutionVectorType>
class BackwardEuler :
    public TimeIntegratorBase<SolutionVectorType>::template Register<
        BackwardEuler<SolutionVectorType>>
{
 
public:
 
    using ValueType = typename SolutionVectorType::VectorValueType;
    using Base = TimeIntegratorBase<SolutionVectorType>::template Register<
        BackwardEuler<SolutionVectorType>>;
 
    BackwardEuler(const Dictionary& timeIntegrationDict, const Dictionary& solutionDict)
        : Base(timeIntegrationDict, solutionDict)
    {}
 
    static std::string name() { return "backwardEuler"; }
 
    static std::string doc() { return "first order implicit time integration method"; }
 
    static std::string schema() { return "none"; }
 
    void solve(dsl::Expression<ValueType>&, SolutionVectorType&, scalar, scalar) override {}
 
    std::unique_ptr<TimeIntegratorBase<SolutionVectorType>> clone() const override
    {
        return std::make_unique<BackwardEuler>(*this);
    }
 
    bool explicitIntegration() const override { return false; }
};
 
} // namespace NeoN