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comparison src/SbpOperators/boundaryops/normal_derivative.jl @ 651:67639b1c99ea

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Merged feature/volume_and_boundary_operators
author Vidar Stiernström <vidar.stiernstrom@it.uu.se>
date Wed, 20 Jan 2021 17:52:55 +0100
parents bfc893d03cbf
children 1accc3e051d0
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615:52749b687a67 651:67639b1c99ea
1 """
2 NormalDerivative(grid::EquidistantGrid, closure_stencil::Stencil, boundary::CartesianBoundary)
3 NormalDerivative(grid::EquidistantGrid{1}, closure_stencil::Stencil, region::Region)
4
5 Creates the normal derivative boundary operator `d` as a `TensorMapping`
6
7 `d` is the normal derivative of a grid function at the boundary specified by `boundary` or `region` using some `closure_stencil`.
8 `d'` is the prolongation of the normal derivative of a grid function to the whole grid using the same `closure_stencil`.
9 On a one-dimensional `grid`, `d` is a `BoundaryOperator`. On a multi-dimensional `grid`, `d` is the inflation of
10 a `BoundaryOperator`. Also see the documentation of `SbpOperators.boundary_operator(...)` for more details.
11 """
12 function NormalDerivative(grid::EquidistantGrid, closure_stencil::Stencil, boundary::CartesianBoundary)
13 direction = dim(boundary)
14 h_inv = inverse_spacing(grid)[direction]
15 return SbpOperators.boundary_operator(grid, scale(closure_stencil,h_inv), boundary)
16 end
17 NormalDerivative(grid::EquidistantGrid{1}, closure_stencil::Stencil, region::Region) = NormalDerivative(grid, closure_stencil, CartesianBoundary{1,typeof(region)}())
18 export NormalDerivative