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annotate src/SbpOperators/boundaryops/normal_derivative.jl @ 1085:d5a82a142d6a feature/scalar_times_tensor

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author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Sun, 08 May 2022 11:34:51 +0200
parents 7fc8df5157a7
children 157a78959e5d
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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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16 return SbpOperators.boundary_operator(grid, scale(closure_stencil,h_inv), boundary)
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17 end
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19 """
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20 normal_derivative(grid, stencil_set, boundary)
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22 Creates a `normal_derivative` operator on `grid` given a `stencil_set`.
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23 """
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24 normal_derivative(grid, stencil_set::StencilSet, boundary) = normal_derivative(grid, parse_stencil(stencil_set["d1"]["closure"]), boundary)