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| 1 | // -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- | ||
| 2 | // vi: set et ts=4 sw=4 sts=4: | ||
| 3 | // | ||
| 4 | // SPDX-FileCopyrightInfo: Copyright © DuMux Project contributors, see AUTHORS.md in root folder | ||
| 5 | // SPDX-License-Identifier: GPL-3.0-or-later | ||
| 6 | // | ||
| 7 | #ifndef DUMUX_MATERIAL_DIFFUSIVITY_CONSTANT_TORTUOSITY_HH | ||
| 8 | #define DUMUX_MATERIAL_DIFFUSIVITY_CONSTANT_TORTUOSITY_HH | ||
| 9 | |||
| 10 | #include <dumux/common/parameters.hh> | ||
| 11 | |||
| 12 | namespace Dumux { | ||
| 13 | |||
| 14 | /*! | ||
| 15 | * \addtogroup EffectiveDiffusivity | ||
| 16 | * \copydetails Dumux::DiffusivityConstantTortuosity | ||
| 17 | */ | ||
| 18 | |||
| 19 | /*! | ||
| 20 | * \ingroup EffectiveDiffusivity | ||
| 21 | * \brief Relation for the effective diffusion coefficient with constant tortuosity | ||
| 22 | * | ||
| 23 | * ### Constant Tortuosity | ||
| 24 | * | ||
| 25 | * For `DiffusivityConstantTortuosity`, \f$ \tau = \text{const.} \f$, | ||
| 26 | * with default value 0.5, empirically obtained by Carman \cite carman1937. | ||
| 27 | * The value can be changed at runtime by setting parameter | ||
| 28 | * `"SpatialParams.Tortuosity"`. This will change the value of \f$ \tau \f$, | ||
| 29 | * and therefore the effective diffusion coefficient wherever | ||
| 30 | * the function `effectiveDiffusionCoefficient` is used. | ||
| 31 | */ | ||
| 32 | template<class Scalar> | ||
| 33 | class DiffusivityConstantTortuosity | ||
| 34 | { | ||
| 35 | public: | ||
| 36 | /*! | ||
| 37 | * \brief Returns the effective diffusion coefficient (\f$\mathrm{m^2/s}\f$) | ||
| 38 | * | ||
| 39 | * Returns the effective diffusion coefficient (\f$\mathrm{m^2/s}\f$) | ||
| 40 | * of component \f$ \kappa \f$ (index `compIdxI`) in phase \f$ \alpha \f$ based | ||
| 41 | * on a constant tortuosity coefficient: \f$ D^\kappa_{\text{eff},\alpha} = \phi S_\alpha \tau D^\kappa_\alpha \f$. | ||
| 42 | * | ||
| 43 | * \param volVars The volume variables | ||
| 44 | * \param phaseIdx the index of phase \f$ \alpha \f$ | ||
| 45 | * \param compIdxI the component index i (the component diffusing in phase \f$ \alpha \f$) | ||
| 46 | * \param compIdxJ the component index j (the main component of phase \f$ \alpha \f$) | ||
| 47 | */ | ||
| 48 | template<class VolumeVariables> | ||
| 49 | 76590786 | static Scalar effectiveDiffusionCoefficient(const VolumeVariables& volVars, | |
| 50 | const int phaseIdx, | ||
| 51 | const int compIdxI, | ||
| 52 | const int compIdxJ) | ||
| 53 | { | ||
| 54 |
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76590786 | static const Scalar tau = getParam<Scalar>("SpatialParams.Tortuosity", 0.5); |
| 55 | 76590786 | const Scalar diffCoeff = volVars.diffusionCoefficient(phaseIdx, compIdxI, compIdxJ); | |
| 56 | 153180570 | return volVars.porosity() * volVars.saturation(phaseIdx) * tau * diffCoeff; | |
| 57 | } | ||
| 58 | |||
| 59 | }; | ||
| 60 | } // end namespace Dumux | ||
| 61 | |||
| 62 | #endif | ||
| 63 |