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	tadd twist test - slidergrid - grid of elastic sliders on a frictional surface
	git clone git://src.adamsgaard.dk/slidergrid
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	---
	commit 476c2046fbb6ac2eef3d7a24403db6918e665dde
	parent 399bec23e552877fa5063f68fed06706d4d109eb
	Author: Anders Damsgaard Christensen <[email protected]>
	Date: Tue, 19 Apr 2016 16:08:17 -0700

	add twist test

	Diffstat:
	A tests/elasticity/twist.c \| 48 +++++++++++++++++++++++++++++…

	1 file changed, 48 insertions(+), 0 deletions(-)
	---
	diff --git a/tests/elasticity/twist.c b/tests/elasticity/twist.c
	t@@ -0,0 +1,48 @@
	+#include "../../slidergrid/simulation.h"
	+#include "../../slidergrid/grid.h"
	+#include "../../slidergrid/slider.h"
	+
	+#include <stdio.h>
	+
	+// test a regular, 2d, orthogonal grid of sliders
	+simulation setup_simulation()
	+{
	+ // create empty simulation structure with default values
	+ simulation sim = create_simulation();
	+ sim.id = "twist";
	+
	+ // initialize grid of sliders
	+ //int nx = 20;
	+ int nx = 2;
	+ int ny = 1;
	+ int nz = 1;
	+ sim.N = nxnynz;
	+ sim.sliders = create_regular_slider_grid(nx, ny, nz, 1.0, 1.0, 1.0);
	+
	+ sim.bond_length_limit = 1.5;
	+
	+ // set slider masses and moments of inertia
	+ int i;
	+ for (i=0; i<sim.N; i++) {
	+
	+ // set default values
	+ initialize_slider_values(&sim.sliders[i]);
	+
	+ // set custom values for certain parameters
	+ sim.sliders[i].mass = 10.0;
	+ sim.sliders[i].moment_of_inertia = 1.0e3;
	+ sim.sliders[i].bond_parallel_kv_stiffness = 1.0e4;
	+ sim.sliders[i].bond_shear_kv_stiffness = 1.0e5;
	+ sim.sliders[i].bond_twist_kv_stiffness = 1.0e5;
	+ }
	+
	+ sim.sliders[0].angvel.x = 1.0e1;
	+
	+ // set temporal parameters
	+ //sim.time_end = 100.0;
	+ //sim.file_interval = 1.0;
	+ sim.time_end = 1.0;
	+ sim.file_interval = 1.0e-3;
	+
	+ return sim;
	+}