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annotate src/SbpOperators/boundaryops/normal_derivative.jl @ 777:5eb1edef8a7b refactor/sbp_operators_method_signatures

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Remove some more unneded types
author Jonatan Werpers <jonatan@werpers.com>
date Sat, 17 Jul 2021 18:13:20 +0200
parents 1accc3e051d0
children 86776d06b883
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bfc893d03cbf Add NormalDerivative as a BoundaryOperator and reintroduce tests.
Vidar Stiernström <vidar.stiernstrom@it.uu.se>
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1 """
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2 normal_derivative(grid::EquidistantGrid, closure_stencil::Stencil, boundary::CartesianBoundary)
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3 normal_derivative(grid::EquidistantGrid{1}, closure_stencil::Stencil, region::Region)
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5 Creates the normal derivative boundary operator `d` as a `TensorMapping`
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bfc893d03cbf Add NormalDerivative as a BoundaryOperator and reintroduce tests.
Vidar Stiernström <vidar.stiernstrom@it.uu.se>
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7 `d` is the normal derivative of a grid function at the boundary specified by `boundary` or `region` using some `closure_stencil`.
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8 `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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9 On a one-dimensional `grid`, `d` is a `BoundaryOperator`. On a multi-dimensional `grid`, `d` is the inflation of
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10 a `BoundaryOperator`. Also see the documentation of `SbpOperators.boundary_operator(...)` for more details.
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11 """
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12 function normal_derivative(grid::EquidistantGrid, closure_stencil, boundary::CartesianBoundary)
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13 direction = dim(boundary)
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14 h_inv = inverse_spacing(grid)[direction]
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15 return SbpOperators.boundary_operator(grid, scale(closure_stencil,h_inv), boundary)
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16 end
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17 normal_derivative(grid::EquidistantGrid{1}, closure_stencil, region::Region) = normal_derivative(grid, closure_stencil, CartesianBoundary{1,typeof(region)}())
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18 export normal_derivative