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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 slip condition | ||
| 11 | */ | ||
| 12 | #ifndef DUMUX_FREEFLOW_NAVIERSTOKES_SLIPCONDITION_HH | ||
| 13 | #define DUMUX_FREEFLOW_NAVIERSTOKES_SLIPCONDITION_HH | ||
| 14 | |||
| 15 | #include <dune/common/fvector.hh> | ||
| 16 | #include <dumux/common/tag.hh> | ||
| 17 | #include <dumux/common/parameters.hh> | ||
| 18 | #include <dumux/discretization/method.hh> | ||
| 19 | |||
| 20 | namespace Dumux::NavierStokes::SlipConditions { | ||
| 21 | |||
| 22 | /*! | ||
| 23 | * \ingroup NavierStokesModel | ||
| 24 | * \brief Tag for the Beavers-Joseph slip condition | ||
| 25 | */ | ||
| 26 | struct BJ : public Utility::Tag<BJ> { | ||
| 27 | static std::string name() { return "Beavers-Joseph"; } | ||
| 28 | }; | ||
| 29 | |||
| 30 | /*! | ||
| 31 | * \ingroup NavierStokesModel | ||
| 32 | * \brief Tag for the Beavers-Joseph-Saffman slip condition | ||
| 33 | */ | ||
| 34 | struct BJS : public Utility::Tag<BJS> { | ||
| 35 | static std::string name() { return "Beavers-Joseph-Saffman"; } | ||
| 36 | }; | ||
| 37 | |||
| 38 | /*! | ||
| 39 | * \ingroup NavierStokesModel | ||
| 40 | * \brief Tag for the Beavers-Joseph slip condition | ||
| 41 | */ | ||
| 42 | inline constexpr BJ bj{}; | ||
| 43 | |||
| 44 | /*! | ||
| 45 | * \ingroup NavierStokesModel | ||
| 46 | * \brief Tag for the Beavers-Joseph-Saffman slip condition | ||
| 47 | */ | ||
| 48 | inline constexpr BJS bjs{}; | ||
| 49 | |||
| 50 | } // end namespace Dumux::NavierStokes::SlipConditions | ||
| 51 | |||
| 52 | namespace Dumux { | ||
| 53 | |||
| 54 | /*! | ||
| 55 | * \ingroup NavierStokesModel | ||
| 56 | * \brief Navier Stokes slip velocity policy | ||
| 57 | */ | ||
| 58 | template<class DiscretizationMethod, class SlipCondition> | ||
| 59 | class NavierStokesSlipVelocity; | ||
| 60 | |||
| 61 | /*! | ||
| 62 | * \ingroup NavierStokesModel | ||
| 63 | * \brief Navier Stokes slip velocity helper for fcstaggered discretization | ||
| 64 | * | ||
| 65 | * For now, this class implements the Beavers-Joseph or the Beavers-Joseph-Saffman condition | ||
| 66 | * which models the slip velocity at a porous boundary. The condition is chosen by passing | ||
| 67 | * the corresponding SlipCondition tag to the class. | ||
| 68 | */ | ||
| 69 | template<class SlipCondition> | ||
| 70 | class NavierStokesSlipVelocity<DiscretizationMethods::FCStaggered, SlipCondition> | ||
| 71 | { | ||
| 72 | public: | ||
| 73 | static constexpr SlipCondition slipCondition{}; | ||
| 74 | |||
| 75 | /*! | ||
| 76 | * \brief Returns the slip velocity at a porous boundary based on the Beavers-Joseph(-Saffman) condition. | ||
| 77 | * \note This only returns a vector filled with one component of the slip velocity (corresponding to the dof axis of the scv the svf belongs to) | ||
| 78 | * \param problem The problem | ||
| 79 | * \param fvGeometry The finite-volume geometry | ||
| 80 | * \param scvf The sub control volume face | ||
| 81 | * \param elemVolVars The volume variables for the element | ||
| 82 | * \param tangentialVelocityDeriv Pre-calculated velocity derivative | ||
| 83 | */ | ||
| 84 | template<class Problem, class FVElementGeometry, class ElementVolumeVariables, class Scalar> | ||
| 85 | 147310 | static auto velocity(const Problem& problem, | |
| 86 | const FVElementGeometry& fvGeometry, | ||
| 87 | const typename FVElementGeometry::SubControlVolumeFace& scvf, | ||
| 88 | const ElementVolumeVariables& elemVolVars, | ||
| 89 | Scalar tangentialVelocityDeriv) | ||
| 90 | { | ||
| 91 |
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147310 | assert(scvf.isLateral()); |
| 92 |
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147310 | assert(scvf.boundary()); |
| 93 | |||
| 94 | static constexpr int dimWorld = FVElementGeometry::GridGeometry::GridView::dimensionworld; | ||
| 95 | using Vector = Dune::FieldVector<Scalar, dimWorld>; | ||
| 96 | |||
| 97 | 147310 | Vector porousMediumVelocity(0.0); | |
| 98 | |||
| 99 | if constexpr (slipCondition == NavierStokes::SlipConditions::bj) | ||
| 100 | 3606 | porousMediumVelocity = problem.porousMediumVelocity(fvGeometry, scvf); | |
| 101 | else if (!(slipCondition == NavierStokes::SlipConditions::bjs)) | ||
| 102 | DUNE_THROW(Dune::NotImplemented, "Fcstaggered currently only implements BJ or BJS slip conditions"); | ||
| 103 | |||
| 104 |
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294620 | const auto& scv = fvGeometry.scv(scvf.insideScvIdx()); |
| 105 | |||
| 106 | // create a unit normal vector oriented in positive coordinate direction | ||
| 107 | 147310 | Vector tangent(0.0); | |
| 108 | 147310 | tangent[scv.dofAxis()] = 1.0; | |
| 109 | |||
| 110 | // du/dy + dv/dx = beta * (u_boundary-uPM) | ||
| 111 | // beta = alpha/sqrt(K) | ||
| 112 | 147310 | const Scalar betaBJ = problem.betaBJ(fvGeometry, scvf, tangent); | |
| 113 | 589240 | const Scalar distanceNormalToBoundary = (scvf.ipGlobal() - scv.dofPosition()).two_norm(); | |
| 114 | |||
| 115 |
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147310 | static const bool onlyNormalGradient = getParamFromGroup<bool>(problem.paramGroup(), "FreeFlow.EnableUnsymmetrizedVelocityGradientForBeaversJoseph", false); |
| 116 |
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147310 | if (onlyNormalGradient) |
| 117 | 63680 | tangentialVelocityDeriv = 0.0; | |
| 118 | |||
| 119 | 294620 | const Scalar scalarSlipVelocity = (tangentialVelocityDeriv*distanceNormalToBoundary | |
| 120 | 147310 | + porousMediumVelocity * tangent * betaBJ * distanceNormalToBoundary | |
| 121 | 147310 | + elemVolVars[scv].velocity()) / (betaBJ*distanceNormalToBoundary + 1.0); | |
| 122 | |||
| 123 | 294620 | return scalarSlipVelocity*tangent; | |
| 124 | } | ||
| 125 | }; | ||
| 126 | |||
| 127 | } // end namespace Dumux | ||
| 128 | |||
| 129 | #endif | ||
| 130 |