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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 NavierStokesModel | ||
| 10 | * \brief Navier Stokes scalar boundary flux helper | ||
| 11 | */ | ||
| 12 | #ifndef DUMUX_NAVIERSTOKES_SCALAR_BOUNDARY_FLUXHELPER_HH | ||
| 13 | #define DUMUX_NAVIERSTOKES_SCALAR_BOUNDARY_FLUXHELPER_HH | ||
| 14 | |||
| 15 | #include <dune/common/float_cmp.hh> | ||
| 16 | #include <dune/common/std/type_traits.hh> | ||
| 17 | #include <dumux/common/math.hh> | ||
| 18 | #include <dumux/common/parameters.hh> | ||
| 19 | #include <dumux/discretization/elementsolution.hh> | ||
| 20 | |||
| 21 | namespace Dumux { | ||
| 22 | |||
| 23 | #ifndef DOXYGEN | ||
| 24 | namespace Detail { | ||
| 25 | // helper structs and functions detecting if the VolumeVariables belong to a non-isothermal model | ||
| 26 | template <class Indices> | ||
| 27 | using NonisothermalDetector = decltype(std::declval<Indices>().energyEqIdx); | ||
| 28 | |||
| 29 | template<class Indices> | ||
| 30 | static constexpr bool isNonIsothermal() | ||
| 31 | { return Dune::Std::is_detected<NonisothermalDetector, Indices>::value; } | ||
| 32 | |||
| 33 | } // end namespace Detail | ||
| 34 | #endif | ||
| 35 | |||
| 36 | /*! | ||
| 37 | * \ingroup NavierStokesModel | ||
| 38 | * \brief Navier Stokes scalar boundary flux helper | ||
| 39 | */ | ||
| 40 | template<class AdvectiveFlux> | ||
| 41 | struct NavierStokesScalarBoundaryFluxHelper | ||
| 42 | { | ||
| 43 | /*! | ||
| 44 | * \brief Return the area-specific, weighted advective flux of a scalar quantity. | ||
| 45 | */ | ||
| 46 | template<class VolumeVariables, class SubControlVolumeFace, class Scalar, class UpwindTerm> | ||
| 47 | ✗ | static Scalar advectiveScalarUpwindFlux(const VolumeVariables& insideVolVars, | |
| 48 | const VolumeVariables& outsideVolVars, | ||
| 49 | const SubControlVolumeFace& scvf, | ||
| 50 | const Scalar volumeFlux, | ||
| 51 | const Scalar upwindWeight, | ||
| 52 | UpwindTerm upwindTerm) | ||
| 53 | { | ||
| 54 | using std::signbit; | ||
| 55 |
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98700 | const bool insideIsUpstream = !signbit(volumeFlux); |
| 56 | |||
| 57 |
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49350 | const auto& upstreamVolVars = insideIsUpstream ? insideVolVars : outsideVolVars; |
| 58 |
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49350 | const auto& downstreamVolVars = insideIsUpstream ? outsideVolVars : insideVolVars; |
| 59 | |||
| 60 | 716889 | return (upwindWeight * upwindTerm(upstreamVolVars) + | |
| 61 | 477926 | (1.0 - upwindWeight) * upwindTerm(downstreamVolVars)) | |
| 62 | 238963 | * volumeFlux; | |
| 63 | } | ||
| 64 | |||
| 65 | template<class Indices, class NumEqVector, class UpwindFunction> | ||
| 66 | 26910 | static void addModelSpecificAdvectiveFlux(NumEqVector& flux, | |
| 67 | const UpwindFunction& upwind) | ||
| 68 | { | ||
| 69 | // add advective fluxes based on physical type of model | ||
| 70 | 440126 | AdvectiveFlux::addAdvectiveFlux(flux, upwind); | |
| 71 | |||
| 72 | // for non-isothermal models, add the energy flux | ||
| 73 | if constexpr (Detail::isNonIsothermal<Indices>()) | ||
| 74 | { | ||
| 75 | ✗ | auto upwindTerm = [](const auto& volVars) { return volVars.density()*volVars.enthalpy(); }; | |
| 76 | 80730 | flux[Indices::energyEqIdx] = upwind(upwindTerm); | |
| 77 | } | ||
| 78 | 26910 | } | |
| 79 | |||
| 80 | /*! | ||
| 81 | * \brief Return the area-specific outflow fluxes for all scalar balance equations. | ||
| 82 | * The values specified in outsideBoundaryPriVars are used in case of flow reversal. | ||
| 83 | */ | ||
| 84 | template<class Problem, class Element, class FVElementGeometry, class ElementVolumeVariables> | ||
| 85 | static auto scalarOutflowFlux(const Problem& problem, | ||
| 86 | const Element& element, | ||
| 87 | const FVElementGeometry& fvGeometry, | ||
| 88 | const typename FVElementGeometry::SubControlVolumeFace& scvf, | ||
| 89 | const ElementVolumeVariables& elemVolVars, | ||
| 90 | typename ElementVolumeVariables::VolumeVariables::PrimaryVariables&& outsideBoundaryPriVars, | ||
| 91 | const typename ElementVolumeVariables::VolumeVariables::PrimaryVariables::value_type upwindWeight = 1.0) | ||
| 92 | { | ||
| 93 | using VolumeVariables = typename ElementVolumeVariables::VolumeVariables; | ||
| 94 | using PrimaryVariables = typename VolumeVariables::PrimaryVariables; | ||
| 95 | using NumEqVector = PrimaryVariables; | ||
| 96 | NumEqVector flux; | ||
| 97 | const auto velocity = problem.faceVelocity(element,fvGeometry, scvf); | ||
| 98 | const auto volumeFlux = velocity * scvf.unitOuterNormal(); | ||
| 99 | using std::signbit; | ||
| 100 | const bool insideIsUpstream = !signbit(volumeFlux); | ||
| 101 | const VolumeVariables& insideVolVars = elemVolVars[scvf.insideScvIdx()]; | ||
| 102 | const VolumeVariables& outsideVolVars = [&]() | ||
| 103 | { | ||
| 104 | // only use the inside volVars for "true" outflow conditions (avoid constructing the outside volVars) | ||
| 105 | if (insideIsUpstream && Dune::FloatCmp::eq(upwindWeight, 1.0, 1e-6)) | ||
| 106 | return insideVolVars; | ||
| 107 | else | ||
| 108 | { | ||
| 109 | // construct outside volVars from the given priVars for situations of flow reversal | ||
| 110 | VolumeVariables boundaryVolVars; | ||
| 111 | boundaryVolVars.update(elementSolution<FVElementGeometry>(std::forward<PrimaryVariables>(outsideBoundaryPriVars)), | ||
| 112 | problem, | ||
| 113 | element, | ||
| 114 | fvGeometry.scv(scvf.insideScvIdx())); | ||
| 115 | return boundaryVolVars; | ||
| 116 | } | ||
| 117 | }(); | ||
| 118 | |||
| 119 | auto upwindFuntion = [&](const auto& upwindTerm) | ||
| 120 | { | ||
| 121 | return advectiveScalarUpwindFlux(insideVolVars, outsideVolVars, scvf, volumeFlux, upwindWeight, upwindTerm); | ||
| 122 | }; | ||
| 123 | |||
| 124 | addModelSpecificAdvectiveFlux<typename VolumeVariables::Indices>(flux, upwindFuntion); | ||
| 125 | |||
| 126 | return flux; | ||
| 127 | } | ||
| 128 | |||
| 129 | /*! | ||
| 130 | * \brief Return the area-specific outflow fluxes for all scalar balance equations. | ||
| 131 | * This should only be used if flow reversal never occurs. | ||
| 132 | * A (deactivable) warning is emitted otherwise. | ||
| 133 | */ | ||
| 134 | template<class Problem, class Element, class FVElementGeometry, class ElementVolumeVariables> | ||
| 135 | 238963 | static auto scalarOutflowFlux(const Problem& problem, | |
| 136 | const Element& element, | ||
| 137 | const FVElementGeometry& fvGeometry, | ||
| 138 | const typename FVElementGeometry::SubControlVolumeFace& scvf, | ||
| 139 | const ElementVolumeVariables& elemVolVars) | ||
| 140 | { | ||
| 141 | using VolumeVariables = typename ElementVolumeVariables::VolumeVariables; | ||
| 142 | using NumEqVector = typename VolumeVariables::PrimaryVariables; | ||
| 143 | 238963 | NumEqVector flux; | |
| 144 | 238963 | const auto velocity = problem.faceVelocity(element,fvGeometry, scvf); | |
| 145 | 406872 | const auto volumeFlux = velocity * scvf.unitOuterNormal(); | |
| 146 | using std::signbit; | ||
| 147 | 238963 | const bool insideIsUpstream = !signbit(volumeFlux); | |
| 148 | 477926 | const VolumeVariables& insideVolVars = elemVolVars[scvf.insideScvIdx()]; | |
| 149 | |||
| 150 | if constexpr (VolumeVariables::FluidSystem::isCompressible(0/*phaseIdx*/) /*TODO viscosityIsConstant*/ || NumEqVector::size() > 1) | ||
| 151 | { | ||
| 152 |
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49350 | static const bool verbose = getParamFromGroup<bool>(problem.paramGroup(), "Flux.EnableOutflowReversalWarning", true); |
| 153 | using std::abs; | ||
| 154 |
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49350 | if (verbose && !insideIsUpstream && abs(volumeFlux) > 1e-10) |
| 155 | { | ||
| 156 | ✗ | std::cout << "velo " << velocity << ", flux " << volumeFlux << std::endl; | |
| 157 | ✗ | std::cout << "\n ********** WARNING ********** \n\n" | |
| 158 | ✗ | "Outflow condition set at " << scvf.center() << " might be invalid due to flow reversal. " | |
| 159 | "Consider using \n" | ||
| 160 | "scalarOutflowFlux(problem, element, fvGeometry, scvf, elemVolVars, outsideBoundaryPriVars, upwindWeight) \n" | ||
| 161 | "instead where you can specify primary variables for inflow situations.\n" | ||
| 162 | ✗ | "\n ***************************** \n" << std::endl; | |
| 163 | } | ||
| 164 | } | ||
| 165 | |||
| 166 | 238963 | auto upwindFuntion = [&](const auto& upwindTerm) | |
| 167 | { | ||
| 168 | 451676 | return advectiveScalarUpwindFlux(insideVolVars, insideVolVars, scvf, volumeFlux, 1.0 /*upwindWeight*/, upwindTerm); | |
| 169 | }; | ||
| 170 | |||
| 171 | 428576 | addModelSpecificAdvectiveFlux<typename VolumeVariables::Indices>(flux, upwindFuntion); | |
| 172 | |||
| 173 | 238963 | return flux; | |
| 174 | } | ||
| 175 | }; | ||
| 176 | |||
| 177 | } // end namespace Dumux | ||
| 178 | |||
| 179 | #endif | ||
| 180 |