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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 | #ifndef DUMUX_EXAMPLES_FREEFLOW_CHANNEL_PROBLEM_HH | ||
9 | #define DUMUX_EXAMPLES_FREEFLOW_CHANNEL_PROBLEM_HH | ||
10 | |||
11 | // ## Initial and boundary conditions (`problem.hh`) | ||
12 | // | ||
13 | // This file contains the __problem class__ which defines the initial and boundary | ||
14 | // conditions for the Navier-Stokes single-phase flow simulation. | ||
15 | // | ||
16 | // [[content]] | ||
17 | // | ||
18 | // ### Include files | ||
19 | // | ||
20 | // Include the `NavierStokesStaggeredProblem` class, the base | ||
21 | // class from which we will derive. | ||
22 | #include <dumux/freeflow/navierstokes/staggered/problem.hh> | ||
23 | // Include the `NavierStokesBoundaryTypes` class which specifies the boundary types set in this problem. | ||
24 | #include <dumux/freeflow/navierstokes/boundarytypes.hh> | ||
25 | |||
26 | // ### The problem class | ||
27 | // We enter the problem class `ChannelExampleProblem` where all necessary boundary conditions and initial conditions are set for our simulation. | ||
28 | // As we are solving a problem related to free flow, we inherit from the base class `NavierStokesStaggeredProblem`. | ||
29 | // [[codeblock]] | ||
30 | namespace Dumux { | ||
31 | |||
32 | template <class TypeTag> | ||
33 | 1 | class ChannelExampleProblem : public NavierStokesStaggeredProblem<TypeTag> | |
34 | { | ||
35 | // A few convenience aliases used throughout this class. | ||
36 | using ParentType = NavierStokesStaggeredProblem<TypeTag>; | ||
37 | using GridGeometry = GetPropType<TypeTag, Properties::GridGeometry>; | ||
38 | using FVElementGeometry = typename GridGeometry::LocalView; | ||
39 | using SubControlVolumeFace = typename GridGeometry::SubControlVolumeFace; | ||
40 | using Indices = typename GetPropType<TypeTag, Properties::ModelTraits>::Indices; | ||
41 | using PrimaryVariables = GetPropType<TypeTag, Properties::PrimaryVariables>; | ||
42 | using BoundaryTypes = Dumux::NavierStokesBoundaryTypes<PrimaryVariables::size()>; | ||
43 | using Scalar = GetPropType<TypeTag, Properties::Scalar>; | ||
44 | |||
45 | using Element = typename GridGeometry::GridView::template Codim<0>::Entity; | ||
46 | using GlobalPosition = typename Element::Geometry::GlobalCoordinate; | ||
47 | |||
48 | public: | ||
49 | // This is the constructor of our problem class: | ||
50 | // Within the constructor, we set the inlet velocity to a run-time specified value. | ||
51 | // If no run-time value is specified, we set the outlet pressure to 1.1e5 Pa. | ||
52 | 1 | ChannelExampleProblem(std::shared_ptr<const GridGeometry> gridGeometry) | |
53 |
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3 | : ParentType(gridGeometry) |
54 | { | ||
55 |
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1 | inletVelocity_ = getParam<Scalar>("Problem.InletVelocity"); |
56 |
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1 | outletPressure_ = getParam<Scalar>("Problem.OutletPressure", 1.1e5); |
57 | 1 | } | |
58 | // [[/codeblock]] | ||
59 | |||
60 | // #### Boundary conditions | ||
61 | // With the following function we define the __type of boundary conditions__ depending on the location. | ||
62 | // Three types of boundary conditions can be specified: Dirichlet, Neumann or outflow boundary conditions. On | ||
63 | // Dirichlet boundaries, the values of the primary variables need to be fixed. On Neumann boundaries, | ||
64 | // values for derivatives need to be fixed. Outflow conditions set a gradient of zero in normal direction towards the boundary | ||
65 | // for the respective primary variables (excluding pressure). | ||
66 | // When Dirichlet conditions are set for the pressure, the velocity gradient | ||
67 | // with respect to the direction normal to the boundary is automatically set to zero. | ||
68 | // [[codeblock]] | ||
69 | 48626 | BoundaryTypes boundaryTypesAtPos(const GlobalPosition& globalPos) const | |
70 | { | ||
71 | 48626 | BoundaryTypes values; | |
72 | |||
73 | 97252 | if (isInlet_(globalPos)) | |
74 | { | ||
75 | // We specify Dirichlet boundary conditions for the velocity on the left of our domain | ||
76 | 7810 | values.setDirichlet(Indices::velocityXIdx); | |
77 | 7810 | values.setDirichlet(Indices::velocityYIdx); | |
78 | } | ||
79 | 81632 | else if (isOutlet_(globalPos)) | |
80 | { | ||
81 | // We fix the pressure on the right side of the domain | ||
82 | 9348 | values.setDirichlet(Indices::pressureIdx); | |
83 | } | ||
84 | else | ||
85 | { | ||
86 | // We specify Dirichlet boundary conditions for the velocity on the remaining boundaries (lower and upper wall) | ||
87 | 31468 | values.setDirichlet(Indices::velocityXIdx); | |
88 | 31468 | values.setDirichlet(Indices::velocityYIdx); | |
89 | } | ||
90 | |||
91 | 48626 | return values; | |
92 | } | ||
93 | // [[/codeblock]] | ||
94 | |||
95 | // The following function specifies the __values on Dirichlet boundaries__. | ||
96 | // We need to define values for the primary variables (velocity and pressure). | ||
97 | // [[codeblock]] | ||
98 | PrimaryVariables dirichletAtPos(const GlobalPosition& globalPos) const | ||
99 | { | ||
100 | // Use the initial values as default Dirichlet values | ||
101 | 24370 | PrimaryVariables values = initialAtPos(globalPos); | |
102 | |||
103 | // Set a no-slip condition at the top and bottom wall of the channel | ||
104 | 48740 | if (!isInlet_(globalPos)) | |
105 | 35808 | values[Indices::velocityXIdx] = 0.0; | |
106 | |||
107 | return values; | ||
108 | } | ||
109 | // [[/codeblock]] | ||
110 | |||
111 | // The following function defines the initial conditions. | ||
112 | // [[codeblock]] | ||
113 | ✗ | PrimaryVariables initialAtPos(const GlobalPosition& globalPos) const | |
114 | { | ||
115 | 42332 | PrimaryVariables values; | |
116 | |||
117 | // Set the pressure and velocity values | ||
118 |
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755018 | values[Indices::pressureIdx] = outletPressure_; |
119 |
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755018 | values[Indices::velocityXIdx] = inletVelocity_; |
120 |
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1487154 | values[Indices::velocityYIdx] = 0.0; |
121 | |||
122 | ✗ | return values; | |
123 | } | ||
124 | // [[/codeblock]] | ||
125 | |||
126 | // The inlet is on the left side of the physical domain. | ||
127 | // [[codeblock]] | ||
128 | private: | ||
129 | ✗ | bool isInlet_(const GlobalPosition& globalPos) const | |
130 |
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143016 | { return globalPos[0] < eps_; } |
131 | // [[/codeblock]] | ||
132 | |||
133 | // The outlet is on the right side of the physical domain. | ||
134 | bool isOutlet_(const GlobalPosition& globalPos) const | ||
135 |
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204080 | { return globalPos[0] > this->gridGeometry().bBoxMax()[0] - eps_; } |
136 | |||
137 | // Finally, private variables are declared: | ||
138 | // [[codeblock]] | ||
139 | static constexpr Scalar eps_ = 1e-6; | ||
140 | Scalar inletVelocity_; | ||
141 | Scalar outletPressure_; | ||
142 | |||
143 | }; // end class definition of ChannelExampleProblem | ||
144 | } // end namespace Dumux | ||
145 | // [[/codeblock]] | ||
146 | // [[/content]] | ||
147 | #endif | ||
148 |