tadd elastic interaction with walls - Granular.jl - Julia package for granular dynamics simulation
(HTM) git clone git://src.adamsgaard.dk/Granular.jl
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---
(DIR) commit c480bcc2d14ba436fa4663aa46cd6d503c8ca905
(DIR) parent 6e8adb0d8a14aa77aaa516f197c72bbe242a9fbb
(HTM) Author: Anders Damsgaard <andersd@riseup.net>
Date: Wed, 15 Nov 2017 11:53:04 -0500
add elastic interaction with walls
Diffstat:
M examples/image.jl | 6 +++---
M examples/two-grains.jl | 1 +
M src/interaction.jl | 28 +++++++++++++++++-----------
M src/simulation.jl | 1 +
M src/wall.jl | 8 ++++++--
M test/wall.jl | 72 ++++++++++++++++++++++++++++---
6 files changed, 94 insertions(+), 22 deletions(-)
---
(DIR) diff --git a/examples/image.jl b/examples/image.jl
t@@ -6,7 +6,7 @@ import Colors
const verbose = true
-const img_file = "Cundall2008.png"
+const img_file = "aadcroft.png"
img = FileIO.load(img_file)
t@@ -20,10 +20,10 @@ end
const img_bw = Colors.Gray.(img)
-#const forcing = "gyres"
+const forcing = "gyres"
#const forcing = "down"
#const forcing = "convergent"
-const forcing = "sandpile"
+#const forcing = "sandpile"
const dx = 1.
const dy = dx
(DIR) diff --git a/examples/two-grains.jl b/examples/two-grains.jl
t@@ -39,3 +39,4 @@ info("Kinetic energy before: $E_kin_before J")
info("Kinetic energy after: $E_kin_after J")
+Granular.render(sim, animation=true)
(DIR) diff --git a/src/interaction.jl b/src/interaction.jl
t@@ -54,18 +54,24 @@ function interactWalls!(sim::Simulation)
# get overlap distance by projecting grain position onto wall-normal
# vector
- δ_n = dot(sim.walls[iw].normal, sim.grains[i].lin_pos) -
- sim.walls[iw].pos - sim.grains[i].contact_radius
-
- if sim.grains[i].youngs_modulus > 0.
- k_n = sim.grains[i].youngs_modulus *
- sim.grains[i].thickness
- else
- k_n = sim.grains[i].contact_stiffness_normal
+ δ_n = abs(dot(sim.walls[iw].normal, sim.grains[i].lin_pos) -
+ sim.walls[iw].pos) - sim.grains[i].contact_radius
+
+ #println(dot(sim.walls[iw].normal, sim.grains[i].lin_pos))
+ #println(sim.walls[iw].pos)
+ #println(sim.grains[i].contact_radius)
+ #println(δ_n)
+
+ if δ_n < 0.
+ if sim.grains[i].youngs_modulus > 0.
+ k_n = sim.grains[i].youngs_modulus * sim.grains[i].thickness
+ else
+ k_n = sim.grains[i].contact_stiffness_normal
+ end
+
+ sim.walls[iw].force += -k_n * δ_n
+ sim.grains[i].force += k_n * abs(δ_n) * sim.walls[iw].normal
end
-
- sim.walls[iw].force += k_n * abs(δ_n)
- sim.grains[i].force += k_n * abs(δ_n) * sim.grains[iw].normal
end
end
end
(DIR) diff --git a/src/simulation.jl b/src/simulation.jl
t@@ -161,6 +161,7 @@ function run!(simulation::Simulation;
end
interact!(simulation)
+ interactWalls!(simulation)
if typeof(simulation.ocean.input_file) != Bool
addOceanDrag!(simulation)
(DIR) diff --git a/src/wall.jl b/src/wall.jl
t@@ -98,7 +98,9 @@ function addWallLinearFrictionless!(simulation::Simulation,
for grain in simulation.grains
mass += grain.mass
end
- info("Setting wall mass to total grain mass: $mass kg")
+ if verbose
+ info("Setting wall mass to total grain mass: $mass kg")
+ end
end
# if not set, set wall thickness to equal largest grain thickness
t@@ -113,7 +115,9 @@ function addWallLinearFrictionless!(simulation::Simulation,
thickness = grain.thickness
end
end
- info("Setting wall thickness to largest grain thickness: $thickness m")
+ if verbose
+ info("Setting wall thickness to max grain thickness: $thickness m")
+ end
end
# Create wall object
(DIR) diff --git a/test/wall.jl b/test/wall.jl
t@@ -5,7 +5,7 @@
info("#### $(basename(@__FILE__)) ####")
info("Testing argument value checks")
-sim = Granular.createSimulation(id="test")
+sim = Granular.createSimulation()
Granular.addGrainCylindrical!(sim, [ 0., 0.], 10., 2., verbose=false)
@test_throws ErrorException Granular.addWallLinearFrictionless!(sim,
[.1, .1, .1],
t@@ -16,13 +16,13 @@ Granular.addGrainCylindrical!(sim, [ 0., 0.], 10., 2., verbose=false)
@test_throws ErrorException Granular.addWallLinearFrictionless!(sim,
[.1, .1, .1],
1.)
-sim = Granular.createSimulation(id="test")
+sim = Granular.createSimulation()
@test_throws ErrorException Granular.addWallLinearFrictionless!(sim, [1., 0.],
1.)
info("Check that wall mass equals total grain mass and max. thickness")
-sim = Granular.createSimulation(id="test")
+sim = Granular.createSimulation()
@test length(sim.walls) == 0
Granular.addGrainCylindrical!(sim, [ 0., 0.], 10., 2., verbose=false)
sim.grains[1].mass = 1.0
t@@ -32,12 +32,12 @@ Granular.addWallLinearFrictionless!(sim, [1., 0.], 1., verbose=true)
@test sim.walls[1].thickness ≈ 2.0
info("Test wall surface area and defined normal stress")
-sim = Granular.createSimulation(id="test")
+sim = Granular.createSimulation()
sim.ocean = Granular.createRegularOceanGrid([1, 1, 1], [10., 20., 1.0])
Granular.addGrainCylindrical!(sim, [ 0., 0.], 10., 2., verbose=false)
sim.grains[1].mass = 1.0
-Granular.addWallLinearFrictionless!(sim, [1., 0.], 1., verbose=true)
-Granular.addWallLinearFrictionless!(sim, [0., 1.], 1., verbose=true)
+Granular.addWallLinearFrictionless!(sim, [1., 0.], 1., verbose=false)
+Granular.addWallLinearFrictionless!(sim, [0., 1.], 1., verbose=false)
@test length(sim.walls) == 2
@test sim.walls[1].mass ≈ 1.0
@test sim.walls[1].thickness ≈ 2.0
t@@ -46,4 +46,64 @@ Granular.addWallLinearFrictionless!(sim, [0., 1.], 1., verbose=true)
@test Granular.getWallSurfaceArea(sim, 1) ≈ 20.0*2.0
@test Granular.getWallSurfaceArea(sim, 2) ≈ 10.0*2.0
+info("Test wall-grain interaction")
+
+info("...wall present but no contact")
+sim = Granular.createSimulation()
+sim.ocean = Granular.createRegularOceanGrid([1, 1, 1], [10., 20., 1.0])
+Granular.addGrainCylindrical!(sim, [ 0., 0.], 1., 2., verbose=false)
+Granular.addWallLinearFrictionless!(sim, [1., 0.], -1.01, verbose=false)
+Granular.interactWalls!(sim)
+@test sim.walls[1].force ≈ 0.
+@test sim.grains[1].force[1] ≈ 0.
+@test sim.grains[1].force[2] ≈ 0.
+
+info("...wall present but no contact")
+sim = Granular.createSimulation()
+sim.ocean = Granular.createRegularOceanGrid([1, 1, 1], [10., 20., 1.0])
+Granular.addGrainCylindrical!(sim, [ 0., 0.], 1., 2., verbose=false)
+Granular.addWallLinearFrictionless!(sim, [-1., 0.], +2.01, verbose=false)
+Granular.interactWalls!(sim)
+@test sim.walls[1].force ≈ 0.
+@test sim.grains[1].force[1] ≈ 0.
+@test sim.grains[1].force[2] ≈ 0.
+
+info("...wall at -x")
+sim = Granular.createSimulation()
+sim.ocean = Granular.createRegularOceanGrid([1, 1, 1], [10., 20., 1.0])
+Granular.addGrainCylindrical!(sim, [ 0., 0.], 1., 2., verbose=false)
+Granular.addWallLinearFrictionless!(sim, [1., 0.], -1. + .01, verbose=false)
+Granular.interactWalls!(sim)
+@test sim.walls[1].force > 0.
+@test sim.grains[1].force[1] > 0.
+@test sim.grains[1].force[2] ≈ 0.
+
+info("...wall at +x")
+sim = Granular.createSimulation()
+sim.ocean = Granular.createRegularOceanGrid([1, 1, 1], [10., 20., 1.0])
+Granular.addGrainCylindrical!(sim, [ 0., 0.], 1., 2., verbose=false)
+Granular.addWallLinearFrictionless!(sim, [-1., 0.], +1. - .01, verbose=false)
+Granular.interactWalls!(sim)
+@test sim.walls[1].force > 0.
+@test sim.grains[1].force[1] < 0.
+@test sim.grains[1].force[2] ≈ 0.
+info("...wall at -y")
+sim = Granular.createSimulation()
+sim.ocean = Granular.createRegularOceanGrid([1, 1, 1], [10., 20., 1.0])
+Granular.addGrainCylindrical!(sim, [ 0., 0.], 1., 2., verbose=false)
+Granular.addWallLinearFrictionless!(sim, [0., 1.], -1. + .01, verbose=false)
+Granular.interactWalls!(sim)
+@test sim.walls[1].force > 0.
+@test sim.grains[1].force[1] ≈ 0.
+@test sim.grains[1].force[2] > 0.
+
+info("...wall at +y")
+sim = Granular.createSimulation()
+sim.ocean = Granular.createRegularOceanGrid([1, 1, 1], [10., 20., 1.0])
+Granular.addGrainCylindrical!(sim, [ 0., 0.], 1., 2., verbose=false)
+Granular.addWallLinearFrictionless!(sim, [0., -1.], +1. - .01, verbose=false)
+Granular.interactWalls!(sim)
+@test sim.walls[1].force > 0.
+@test sim.grains[1].force[1] ≈ 0.
+@test sim.grains[1].force[2] < 0.