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annotate src/SbpOperators/volumeops/derivatives/first_derivative.jl @ 1278:4a0570f325ce refactor/grids

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Add tests for change_length
author Jonatan Werpers <jonatan@werpers.com>
date Sun, 26 Feb 2023 21:04:41 +0100
parents c0ab81e4c39c
children 356ec6a72974
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1 """
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2 first_derivative(grid::EquidistantGrid, inner_stencil, closure_stencils, direction)
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3
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4 Creates the first-derivative operator `D1` as a `LazyTensor`
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6 `D1` approximates the first-derivative d/dξ on `grid` along the coordinate dimension specified by
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7 `direction`, using the stencil `inner_stencil` in the interior and a set of stencils `closure_stencils`
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8 for the points in the closure regions.
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10 On a one-dimensional `grid`, `D1` is a `VolumeOperator`. On a multi-dimensional `grid`, `D1` is the inflation of
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11 a `VolumeOperator`.
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13 See also: [`VolumeOperator`](@ref), [`LazyTensors.inflate`](@ref).
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14 """
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15 function first_derivative(grid::EquidistantGrid, inner_stencil, closure_stencils, direction)
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16 h_inv = inverse_spacing(grid)[direction]
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18 D₁ = VolumeOperator(restrict(grid, direction), scale(inner_stencil,h_inv), scale.(closure_stencils,h_inv), odd)
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19 return LazyTensors.inflate(D₁, size(grid), direction)
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20 end
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23 """
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24 first_derivative(grid, inner_stencil, closure_stencils)
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26 Creates a `first_derivative` operator on a 1D `grid` given `inner_stencil` and `closure_stencils`.
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27 """
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28 first_derivative(grid::EquidistantGrid{1}, inner_stencil::Stencil, closure_stencils) = first_derivative(grid, inner_stencil, closure_stencils, 1)
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31 """
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32 first_derivative(grid, stencil_set::StencilSet, direction)
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34 Creates a `first_derivative` operator on `grid` along coordinate dimension `direction` given a `stencil_set`.
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35 """
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36 function first_derivative(grid::EquidistantGrid, stencil_set::StencilSet, direction)
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37 inner_stencil = parse_stencil(stencil_set["D1"]["inner_stencil"])
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38 closure_stencils = parse_stencil.(stencil_set["D1"]["closure_stencils"])
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39 first_derivative(grid,inner_stencil,closure_stencils,direction);
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40 end
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43 """
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44 first_derivative(grid, stencil_set)
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46 Creates a `first_derivative` operator on a 1D `grid` given a `stencil_set`.
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47 """
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48 first_derivative(grid::EquidistantGrid{1}, stencil_set::StencilSet) = first_derivative(grid, stencil_set, 1)