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annotate src/SbpOperators/volumeops/volume_operator.jl @ 619:332f65c1abf3 feature/volume_and_boundary_operators

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Remove export of BoundaryOperator and VolumeOperator
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Mon, 07 Dec 2020 12:21:22 +0100
parents e71f2f81b5f8
children 9f27f451d0a0
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611
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1 """
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2 volume_operator(grid,inner_stencil,closure_stencils,parity,direction)
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3 Creates a volume operator on a `Dim`-dimensional grid acting along the
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4 specified coordinate `direction`. The action of the operator is determined by the
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5 stencils `inner_stencil` and `closure_stencils`.
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6 When `Dim=1`, the corresponding `VolumeOperator` tensor mapping is returned.
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7 When `Dim>1`, the `VolumeOperator` `op` is inflated by the outer product
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8 of `IdentityMappings` in orthogonal coordinate directions, e.g for `Dim=3`,
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9 the boundary restriction operator in the y-direction direction is `Ix⊗op⊗Iz`.
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10 """
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11 function volume_operator(grid::EquidistantGrid{Dim,T}, inner_stencil::Stencil{T}, closure_stencils::NTuple{M,Stencil{T}}, parity, direction) where {Dim,T,M}
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12 # Create 1D volume operator in along coordinate direction
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13 op = VolumeOperator(restrict(grid, direction), inner_stencil, closure_stencils, parity)
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14 # Create 1D IdentityMappings for each coordinate direction
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15 one_d_grids = restrict.(Ref(grid), Tuple(1:Dim))
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16 Is = IdentityMapping{T}.(size.(one_d_grids))
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17 # Formulate the correct outer product sequence of the identity mappings and
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18 # the volume operator
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19 parts = Base.setindex(Is, op, direction)
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20 return foldl(⊗, parts)
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21 end
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22
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23 """
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24 VolumeOperator{T,N,M,K} <: TensorOperator{T,1}
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25 Implements a one-dimensional constant coefficients volume operator
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26 """
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27 struct VolumeOperator{T,N,M,K} <: TensorMapping{T,1,1}
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28 inner_stencil::Stencil{T,N}
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29 closure_stencils::NTuple{M,Stencil{T,K}}
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30 size::NTuple{1,Int}
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31 parity::Parity
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32 end
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33
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34 function VolumeOperator(grid::EquidistantGrid{1}, inner_stencil, closure_stencils, parity)
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35 return VolumeOperator(inner_stencil, closure_stencils, size(grid), parity)
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36 end
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37
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38 closure_size(::VolumeOperator{T,N,M}) where {T,N,M} = M
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39
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40 LazyTensors.range_size(op::VolumeOperator) = op.size
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41 LazyTensors.domain_size(op::VolumeOperator) = op.size
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42
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43 function LazyTensors.apply(op::VolumeOperator{T}, v::AbstractVector{T}, i::Index{Lower}) where T
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44 return @inbounds apply_stencil(op.closure_stencils[Int(i)], v, Int(i))
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45 end
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46
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47 function LazyTensors.apply(op::VolumeOperator{T}, v::AbstractVector{T}, i::Index{Interior}) where T
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48 return apply_stencil(op.inner_stencil, v, Int(i))
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49 end
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50
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51 function LazyTensors.apply(op::VolumeOperator{T}, v::AbstractVector{T}, i::Index{Upper}) where T
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52 return @inbounds Int(op.parity)*apply_stencil_backwards(op.closure_stencils[op.size[1]-Int(i)+1], v, Int(i))
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53 end
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54
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55 function LazyTensors.apply(op::VolumeOperator{T}, v::AbstractVector{T}, i) where T
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56 r = getregion(i, closure_size(op), op.size[1])
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57 return LazyTensors.apply(op, v, Index(i, r))
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58 end