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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 | /*! | ||
| 8 | * \file | ||
| 9 | * \ingroup Fluidmatrixinteractions | ||
| 10 | * \brief Specification of a function relating volume specific interfacial area to capillary pressure and saturation. | ||
| 11 | * This function is of third order in pc. | ||
| 12 | * \note It is used for calculating the interfacial area between the nonwetting and solid phase | ||
| 13 | * by Nuske 2014 (https://elib.uni-stuttgart.de/handle/11682/614, page 62) \cite nuske2014. | ||
| 14 | * | ||
| 15 | */ | ||
| 16 | #ifndef DUMUX_MATERIAL_FLUIDMATRIX_TWO_P_INTERFACIAL_AREA_EXPONENTIAL_CUBIC | ||
| 17 | #define DUMUX_MATERIAL_FLUIDMATRIX_TWO_P_INTERFACIAL_AREA_EXPONENTIAL_CUBIC | ||
| 18 | |||
| 19 | #include <cmath> | ||
| 20 | #include <dune/common/exceptions.hh> | ||
| 21 | #include <dune/common/float_cmp.hh> | ||
| 22 | #include <dumux/common/parameters.hh> | ||
| 23 | |||
| 24 | namespace Dumux::FluidMatrix { | ||
| 25 | |||
| 26 | /*! | ||
| 27 | * \ingroup Fluidmatrixinteractions | ||
| 28 | * \brief Implementation of a exponential function relating | ||
| 29 | * specific interfacial area to wetting phase saturation and capillary pressure. | ||
| 30 | */ | ||
| 31 | class InterfacialAreaExponentialCubic | ||
| 32 | { | ||
| 33 | public: | ||
| 34 | |||
| 35 | template<class Scalar> | ||
| 36 | struct Params | ||
| 37 | { | ||
| 38 | 1 | Params(Scalar a1 = 0, Scalar a2 = 0, Scalar a3 = 0) | |
| 39 |
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1 | : a1_(a1), a2_(a2), a3_(a3) {} |
| 40 | |||
| 41 | ✗ | Scalar a1() const { return a1_; } | |
| 42 |
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1 | void setA1(Scalar a1) { a1_ = a1; } |
| 43 | |||
| 44 | ✗ | Scalar a2() const { return a2_; } | |
| 45 |
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1 | void setA2(Scalar a2) { a2_ = a2; } |
| 46 | |||
| 47 | ✗ | Scalar a3() const { return a3_; } | |
| 48 |
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1 | void setA3(Scalar a3) { a3_ = a3; } |
| 49 | |||
| 50 | bool operator== (const Params& p) const | ||
| 51 | { | ||
| 52 | return Dune::FloatCmp::eq(a1(), p.a1(), 1e-6) | ||
| 53 | && Dune::FloatCmp::eq(a2(), p.a2(), 1e-6) | ||
| 54 | && Dune::FloatCmp::eq(a3(), p.a3(), 1e-6); | ||
| 55 | } | ||
| 56 | |||
| 57 | private: | ||
| 58 | Scalar a1_, a2_, a3_; | ||
| 59 | }; | ||
| 60 | |||
| 61 | /*! | ||
| 62 | * \brief Construct from a subgroup from the global parameter tree | ||
| 63 | * \note This will give you nice error messages if a mandatory parameter is missing | ||
| 64 | */ | ||
| 65 | template<class Scalar = double> | ||
| 66 | static Params<Scalar> makeParams(const std::string& paramGroup) | ||
| 67 | { | ||
| 68 | const auto a1 = getParamFromGroup<Scalar>(paramGroup, "A1"); | ||
| 69 | const auto a2 = getParamFromGroup<Scalar>(paramGroup, "A2"); | ||
| 70 | const auto a3 = getParamFromGroup<Scalar>(paramGroup, "A3"); | ||
| 71 | return {a1, a2, a3}; | ||
| 72 | } | ||
| 73 | |||
| 74 | /*! | ||
| 75 | * \brief The interfacial area | ||
| 76 | * | ||
| 77 | * the suggested (as estimated from pore network models) interfacial area between the nonwetting and solid phase: | ||
| 78 | * \f$\mathrm{ | ||
| 79 | a_{ns} = a_1 e^{a_2 * S_w } + a_3 * p_c^3 ; | ||
| 80 | }\f$ | ||
| 81 | * \param swe Effective saturation of the wetting phase | ||
| 82 | * \param pc Capillary pressure in \f$\mathrm{[Pa]}\f$ | ||
| 83 | * \param params parameter container for the coefficients of the surface | ||
| 84 | */ | ||
| 85 | template<class Scalar> | ||
| 86 | static Scalar area(const Scalar swe, const Scalar pc, const Params<Scalar>& params) | ||
| 87 | { | ||
| 88 | // TODO think about awn surface for relative saturation | ||
| 89 | 1572480 | const Scalar a1 = params.a1(); | |
| 90 | 1572480 | const Scalar a2 = params.a2(); | |
| 91 | 1572480 | const Scalar a3 = params.a3(); | |
| 92 | |||
| 93 | using std::exp; | ||
| 94 | 1572480 | return a1 * exp( a2 * swe) + a3 * pc * pc * pc ; | |
| 95 | } | ||
| 96 | }; | ||
| 97 | |||
| 98 | } // namespace Dumux::FluidMatrix | ||
| 99 | |||
| 100 | #endif | ||
| 101 |