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annotate src/BoundaryConditions/boundary_condition.jl @ 1167:fd80e9a0ef99 feature/boundary_conditions

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Make use of discretize in sat functions
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Wed, 07 Dec 2022 21:56:00 +0100
parents d26aef8a5987
children bdcdbd4ea9cd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 # TODO: Should BoundaryData just be used for traits
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2 # of the BoundaryConditions? Seems like one then could move the
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3 # the boundary data value val directly to BoundaryCondition
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4 # Not sure how one would do this tho.
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5 """
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6 BoundaryData
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8 A type for storing boundary data, e.g. constant, space-dependent, time-dependent etc.
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9 Subtypes of `BoundaryData` should store the boundary data in a field `val`. The exception
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10 to this is ZeroBoundaryData.
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11 """
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12 abstract type BoundaryData end
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13
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14 """
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15 ConstantBoundaryData
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17 `val` is a scalar value of type T
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18 """
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19 struct ConstantBoundaryData{T<:Number} <: BoundaryData
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20 val::T
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21 end
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22
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23 """
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24 SpaceDependentBoundaryData
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26 `val` is a function of dimensionality equal to the boundary
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27 """
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28 struct SpaceDependentBoundaryData{T<:Function} <: BoundaryData
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29 val::T
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30 end
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31
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32 """
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33 TimeDependentBoundaryData
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34
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35 `val` is a scalar function val(t)
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36 """
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37 struct TimeDependentBoundaryData{T<:Function} <: BoundaryData
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38 val::T
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39 end
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41 """
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42 SpaceTimeDependentBoundaryData
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43
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44 `val` is a timedependent function returning the spacedependent
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45 boundary data at a specific time. For instance, if f(t,x)
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46 is the function describing the spacetimedependent boundary data then
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47 val(t*) returns the function g(x) = f(t*,x...)
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48 """
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49 struct SpaceTimeDependentBoundaryData{T<:Function} <: BoundaryData
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50 val::T
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51
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52 function SpaceTimeDependentBoundaryData(f::Function)
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53 val(t) = (args...) -> f(t,args...)
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54 return new{typeof(val)}(val)
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55 end
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56 end
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57
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58 """
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59 ZeroBoundaryData
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60 """
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61 struct ZeroBoundaryData <: BoundaryData end
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62
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63
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64 """
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65 discretize(::BoundaryData, boundary_grid)
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66
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67 Returns an anonymous time-dependent function f, such that f(t) is
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68 a `LazyArray` holding the `BoundaryData` discretized on `boundary_grid`.
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69 """
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70 # TODO: Is the return type of discretize really a good interface
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71 # for the boundary data?
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72 # Moreover, instead of explicitly converting to a LazyArray here
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73 # should we defer this to evalOn (and extend evalOn for scalars as well)?
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74 # I.e. if evalOn returns a LazyArray, the boundary data is lazy. Otherwise
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75 # it is preallocated.
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76
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77 function discretize(bd::ConstantBoundaryData, boundary_grid)
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78 return t -> LazyTensors.LazyConstantArray(bd.val, size(boundary_grid))
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79 end
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80
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81 function discretize(bd::TimeDependentBoundaryData, boundary_grid)
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82 return t -> LazyTensors.LazyConstantArray(bd.val(t), size(boundary_grid))
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83 end
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84
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85 function discretize(bd::SpaceDependentBoundaryData, boundary_grid)
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86 return t -> evalOn(boundary_grid, bd.val)
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87 end
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88
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89 function discretize(bd::SpaceTimeDependentBoundaryData, boundary_grid)
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90 return t -> evalOn(boundary_grid, bd.val(t))
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91 end
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92
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93 function discretize(::ZeroBoundaryData, boundary_grid)
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94 return t -> LazyTensors.LazyConstantArray(zero(eltype(boundary_grid)), size(boundary_grid))
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95 end
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96
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97 """
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98 BoundaryCondition
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99
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100 A type for implementing data needed in order to impose a boundary condition.
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101 Subtypes refer to perticular types of boundary conditions, e.g. Neumann conditions.
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102 """
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103 abstract type BoundaryCondition{T<:BoundaryData} end
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104
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105 """
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106 data(::BoundaryCondition)
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107
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108 Returns the data stored by the `BoundaryCondition`.
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109 """
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110 data(bc::BoundaryCondition) = bc.data
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111
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112
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113 struct NeumannCondition{BD<:BoundaryData} <: BoundaryCondition{BD}
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114 data::BD
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115 id::BoundaryIdentifier
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116 end
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117
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118 struct DirichletCondition{BD<:BoundaryData} <: BoundaryCondition{BD}
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119 data::BD
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120 id::BoundaryIdentifier
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121 end