DriftFluxModel.h

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#pragma once
 
#include <optional>
#include <string>
 
namespace MaterialPropertyLib
{
struct DriftFluxState
{
    double dryness;
    double vapour_water_density;
    double liquid_water_density;
    double v_mix;
    double C_0;
    double u_gu;
};

struct VoidFractionQuadratic
{
    double a;
    double b;
    double c;
};

double driftFluxProfileParameter(double const dryness);

VoidFractionQuadratic voidFractionQuadratic(DriftFluxState const& state);

double voidFractionResidual(double const alpha, DriftFluxState const& state);

std::string voidFractionClosureDiagnostics(DriftFluxState const& state);

double driftFluxVelocity(double const dryness, double const temperature,
                         double const vapour_water_density,
                         double const liquid_water_density);

double alignedDriftFluxVelocity(double const u_gu, double const v_mix);

DriftFluxState driftFluxState(double const dryness, double const temperature,
                              double const vapour_water_density,
                              double const liquid_water_density,
                              double const v_mix);

std::optional<double> computeVapourVoidFraction(DriftFluxState const& state);

double mixtureSlipParameter(double const alpha, DriftFluxState const& state);
}  // namespace MaterialPropertyLib