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annotate src/SbpOperators/boundaryops/normal_derivative.jl @ 1100:157a78959e5d refactor/sbpoperators/inflation

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Bring up to date
author Jonatan Werpers <jonatan@werpers.com>
date Tue, 10 May 2022 20:34:20 +0200
parents 05a25a5063bb 7fc8df5157a7
children c0ab81e4c39c
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1 """
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2 normal_derivative(grid, closure_stencil::Stencil, boundary)
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4 Creates the normal derivative boundary operator `d` as a `LazyTensor`
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5
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6 `d` computes the normal derivative of a grid function on `boundary` a `Stencil` `closure_stencil`.
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7 `d'` is the prolongation of the normal derivative of a grid function to the whole grid using the same `closure_stencil`.
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8 On a one-dimensional `grid`, `d` is a `BoundaryOperator`. On a multi-dimensional `grid`, `d` is the inflation of
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9 a `BoundaryOperator`.
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11 See also: [`boundary_operator`](@ref).
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12 """
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13 function normal_derivative(grid, closure_stencil, boundary)
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14 direction = dim(boundary)
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15 h_inv = inverse_spacing(grid)[direction]
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17 op = BoundaryOperator(restrict(grid, dim(boundary)), scale(closure_stencil,h_inv), region(boundary))
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18 return LazyTensors.inflate(op, size(grid), dim(boundary))
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19 end
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21 """
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22 normal_derivative(grid, stencil_set, boundary)
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24 Creates a `normal_derivative` operator on `grid` given a `stencil_set`.
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25 """
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26 normal_derivative(grid, stencil_set::StencilSet, boundary) = normal_derivative(grid, parse_stencil(stencil_set["d1"]["closure"]), boundary)