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annotate test/SbpOperators/volumeops/derivatives/first_derivative_test.jl @ 2080:0f949681d3d3 refactor/sbp_operators/direction_check tip

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Check that direction of first/second derivative operators is within the dimension of the grid. Add 1D functions for first/second derivative operators that take a direction.
author Vidar Stiernström <vidar.stiernstrom@gmail.com>
date Fri, 20 Feb 2026 12:01:05 +0100
parents 471a948cd2b2
children
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1 using Test
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4 using Diffinitive.SbpOperators
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5 using Diffinitive.Grids
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6 using Diffinitive.LazyTensors
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8 using Diffinitive.SbpOperators: closure_size, Stencil, VolumeOperator
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9
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10 @testset "first_derivative" begin
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11 @testset "Constructors" begin
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12 stencil_set = read_stencil_set(sbp_operators_path()*"standard_diagonal.toml"; order=2)
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14 g₁ = equidistant_grid(0., 1., 11)
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15 g₂ = equidistant_grid((0.,1.), (1.,3.), 11, 14)
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17 @test first_derivative(g₁, stencil_set) isa LazyTensor{Float64,1,1}
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18 @test first_derivative(g₂, stencil_set, 2) isa LazyTensor{Float64,2,2}
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0f949681d3d3 Check that direction of first/second derivative operators is within the dimension of the grid. Add 1D functions for first/second derivative operators that take a direction.
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20 @test first_derivative(g₁, stencil_set) == first_derivative(g₁, stencil_set, 1)
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21 @test_throws DomainError(3, "Direction must be inside [0, 1].") first_derivative(g₁, stencil_set, 3)
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22
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23 interior_stencil = CenteredStencil(-1,0,1)
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24 closure_stencils = [Stencil(-1,1, center=1)]
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25
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26 @test first_derivative(g₁, interior_stencil, closure_stencils) isa LazyTensor{Float64,1,1}
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27 end
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29 @testset "Accuracy conditions" begin
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30 N = 20
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31 g = equidistant_grid(0//1, 2//1, N)
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33 monomial(x,k) = k < 0 ? zero(x) : x^k/factorial(k)
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34 @testset for order ∈ [2,4]
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35 stencil_set = read_stencil_set(sbp_operators_path()*"standard_diagonal.toml"; order)
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36 D₁ = first_derivative(g, stencil_set)
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38 @testset "boundary x^$k" for k ∈ 0:order÷2
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39 v = eval_on(g, x->monomial(x,k))
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41 @testset for i ∈ 1:closure_size(D₁)
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42 x, = g[i]
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43 @test (D₁*v)[i] == monomial(x,k-1)
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44 end
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46 @testset for i ∈ (N-closure_size(D₁)+1):N
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47 x, = g[i]
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48 @test (D₁*v)[i] == monomial(x,k-1)
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49 end
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50 end
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52 @testset "interior x^$k" for k ∈ 0:order
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53 v = eval_on(g, x->monomial(x,k))
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54
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55 x, = g[10]
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56 @test (D₁*v)[10] == monomial(x,k-1)
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57 end
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58 end
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59 end
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61 @testset "Accuracy on function" begin
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62 @testset "1D" begin
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63 g = equidistant_grid(0., 1., 30)
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64 v = eval_on(g, x->exp(x))
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65 @testset for (order, tol) ∈ [(2, 6e-3),(4, 2e-4)]
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66 stencil_set = read_stencil_set(sbp_operators_path()*"standard_diagonal.toml"; order)
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67 D₁ = first_derivative(g, stencil_set)
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69 @test D₁*v ≈ v rtol=tol
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70 end
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71 end
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73 @testset "2D" begin
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74 g = equidistant_grid((0.,0.),(1.,2.), 30, 60)
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75 v = eval_on(g, (x,y)->exp(0.8x+1.2*y))
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76 @testset for (order, tol) ∈ [(2, 6e-3),(4, 3e-4)]
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77 stencil_set = read_stencil_set(sbp_operators_path()*"standard_diagonal.toml"; order)
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78 Dx = first_derivative(g, stencil_set, 1)
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79 Dy = first_derivative(g, stencil_set, 2)
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81 @test Dx*v ≈ 0.8v rtol=tol
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82 @test Dy*v ≈ 1.2v rtol=tol
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83 end
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84 end
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85 end
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86 end
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