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	tperform relaxation without dynamic walls - sphere - GPU-based 3D discrete elem…
	git clone git://src.adamsgaard.dk/sphere
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	---
	commit 5c4f97d059e56e77b8455060aafacd54f2674c03
	parent 292006e5d71f0d6cf10d53580aacf121dd0affab
	Author: Anders Damsgaard <[email protected]>
	Date: Thu, 19 Jun 2014 10:32:36 +0200

	perform relaxation without dynamic walls

	Diffstat:
	M python/shortening.py \| 17 ++++++++---------

	1 file changed, 8 insertions(+), 9 deletions(-)
	---
	diff --git a/python/shortening.py b/python/shortening.py
	t@@ -40,7 +40,7 @@ Lx = dx*nx
	Ly = dy*ny
	Lz = dz*nz

	-sim = sphere.sim('shortening', nw=1)
	+sim = sphere.sim('shortening', nw=0)

	# insert particles into each cube in 90 degree CCW rotated coordinate system
	# around y
	t@@ -67,34 +67,33 @@ print(sim.np[0])


	## Relaxation
	-# Choose the tangential contact model
	-# 1) Visco-frictional (somewhat incorrect, fast computations)
	-# 2) Elastic-viscous-frictional (more correct, slow computations in dense
	-# packings)
	-sim.contactmodel[0] = 2

	# Add gravitational acceleration
	# Flip geometry so the upper wall pushes downwards
	+sim.g[0] = 0
	sim.g[1] = -9.81
	+sim.g[2] = 0

	sim.periodicBoundariesX()
	sim.uniaxialStrainRate(wvel = 0.0)

	# Set duration of simulation, automatically determine timestep, etc.
	-sim.initTemporal(total=3.0, file_dt = 0.1)
	-
	+sim.initTemporal(total=3.0, file_dt = 0.001)
	sim.zeroKinematics()
	+
	sim.run(dry=True)
	sim.run()
	sim.writeVTKall()

	+
	## Shortening
	+sim = sphere.sim('shortening', nw=1)
	sim.readlast()
	sim.initTemporal(current=0.0, total=5.0, file_dt = 0.01)

	# push down upper wall
	compressional_strain = 0.5
	-sim.uniaxialStrainRate(wvel = compressional_strain*Lx/sim.time_total[0])
	+sim.uniaxialStrainRate(wvel = -compressional_strain*Lx/sim.time_total[0])

	sim.run(dry=True)
	sim.run()