1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
\subsection{\texttt{bingle\_output.py}}\label{code:bingle_output}
\begin{verbatim}
#bingle_output.py: A two-particle collision simulation
# with ASCII data output
# Author: D. Weatherley
# Date: 15 May 2007
# Organisation: ESSCC, University of Queensland
# (C) All rights reserved, 2007.
#
#
#provide forward compatibility for Python 2 interpreters
from __future__ import print_function
#import the appropriate ESyS-Particle modules:
from esys.lsm import *
from esys.lsm.util import Vec3, BoundingBox
#instantiate a simulation object
#and initialise the neighbour search algorithm:
sim = LsmMpi(numWorkerProcesses=1, mpiDimList=[1,1,1])
sim.initNeighbourSearch(
particleType="NRotSphere",
gridSpacing=2.5,
verletDist=0.5
)
#set the number of timesteps and timestep increment:
sim.setNumTimeSteps(10000)
sim.setTimeStepSize(0.001)
#specify the spatial domain for the simulation:
domain = BoundingBox(Vec3(-20,-20,-20), Vec3(20,20,20))
sim.setSpatialDomain(domain)
#add the first particle to the domain:
particle=NRotSphere(id=0, posn=Vec3(-5,5,-5), radius=1.0, mass=1.0)
particle.setLinearVelocity(Vec3(1.0,-1.0,1.0))
sim.createParticle(particle)
#add the second particle to the domain:
particle=NRotSphere(id=1, posn=Vec3(5,5,5), radius=1.5, mass=2.0)
particle.setLinearVelocity(Vec3(-1.0,-1.0,-1.0))
sim.createParticle(particle)
#specify the type of interactions between colliding particles:
sim.createInteractionGroup(
NRotElasticPrms(
name = "elastic_repulsion",
normalK = 10000.0,
scaling = True
)
)
#compute the specified number of timesteps:
N_max = sim.getNumTimeSteps()
n=0
while (n < N_max):
#compute a single timestep:
sim.runTimeStep()
# print the particle position to stdout every 100 timesteps:
if (n%100==0):
particles = sim.getParticleList()
p1 = particles[0].getPosn()
p2 = particles[1].getPosn()
print(n,p1,p2)
# update the total number of timesteps computed (n):
n += 1
#Exit the simulation.
sim.exit()
\end{verbatim}
|
