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Fix test of zero eigenmodes

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A better known example.
This commit is contained in:
Jukka Aho
2017-08-20 19:56:31 +03:00
parent f70209f17e
commit 25d5907e9c
1 changed files with 27 additions and 15 deletions
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test/test_modal_analysis_zero_eigenmodes.jl
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@@ -1,25 +1,37 @@
# This file is a part of JuliaFEM.
# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
using Base.Test
using JuliaFEM
using JuliaFEM.Preprocess
using JuliaFEM.Postprocess
using JuliaFEM.Testing
@testset "zero eigenmode model" begin
meshfile = @__DIR__() * "/testdata/primitives.med"
mesh = aster_read_mesh(meshfile, "TETRA_TET10_1")
model = Problem(mesh, Elasticity, "TET", 3)
update!(model.elements, "youngs modulus", 10.0)
update!(model.elements, "poissons ratio", 1.0/3.0)
update!(model.elements, "density", 10.0)
solver = Solver(Modal)
X = Dict(
1 => [2.0, 3.0, 4.0],
2 => [6.0, 3.0, 2.0],
3 => [2.0, 5.0, 1.0],
4 => [4.0, 3.0, 6.0])
X[5] = 1/2*(X[1] + X[2])
X[6] = 1/2*(X[2] + X[3])
X[7] = 1/2*(X[3] + X[1])
X[8] = 1/2*(X[1] + X[4])
X[9] = 1/2*(X[2] + X[4])
X[10] = 1/2*(X[3] + X[4])
element = Element(Tet10, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10])
update!(element, "youngs modulus", 480.0)
update!(element, "poissons ratio", 1/3)
update!(element, "geometry", X)
update!(element, "density", 105.0)
body = Problem(Elasticity, "TET", 3)
add_elements!(body, [element])
solver = Solver(Modal, body)
solver.properties.nev = 30
push!(solver, model)
assemble!(body, 0.0)
assemble!(body, 0.0, Val{:mass_matrix})
solver()
freqs = solver.properties.eigvals
info("freqs: $freqs")
freqs_expected = [0.0,0.0,0.0,0.0,0.0,0.0,5.05743,5.05743,7.30374,9.55885,9.55885,18.3471,18.3471,19.124,37.008,37.008,47.25,59.8844,63.0,65.3975,65.3975,88.1879,108.854,108.854,131.702,131.702,221.374,301.326,301.326]
@test isapprox(freqs, freqs_expected; atol=1.0e-3)
w2 = solver.properties.eigvals
w2_expected = [5.66054e-16, 1.08925e-15, 1.95035e-15, -2.18372e-15, -8.01069e-15, 9.26902e-15, 0.401407, 0.88248, 1.3185, 2.55833, 3.3538, 5.02371, 7.71933, 8.43733, 11.0521, 19.3262, 26.0944, 28.7033, 51.5814, 59.1422, 83.3597, 91.1507, 121.689, 126.753, 157.938, 160.344, 205.634, 324.608, 468.331]
@test isapprox(w2, w2; atol=1.0e-4)
end