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#############################################################
## ##
## Copyright (c) 2003-2017 by The University of Queensland ##
## Centre for Geoscience Computing ##
## http://earth.uq.edu.au/centre-geoscience-computing ##
## ##
## Primary Business: Brisbane, Queensland, Australia ##
## Licensed under the Open Software License version 3.0 ##
## http://www.apache.org/licenses/LICENSE-2.0 ##
## ##
#############################################################
"""
Module for running a suite of gravity benchmark simulations.
Defines L{GravitySim} class whose instances can be used to run a
single simple gravitational simulation.
"""
from __future__ import division
from esys.lsm import *
from esys.lsm.util import *
from esys.lsm.geometry import *
from esys.lsm.benchmarks import Util
from time import time
import math
import sys
class GravitySim(Util.BenchSim):
def __init__(
self,
numTimeSteps=10000,
numParticles=1000,
spawnExe = "",
spawnArgList = None
):
Util.BenchSim.__init__(
self,
numTimeSteps,
numParticles,
spawnExe,
spawnArgList
)
#
# Set the time step size so that particles don't
# move further than the verletDist.
# This is so the sim doesn't need to update neighbour
# lists.
#
self.gravAcceleration = Vec3(0,0,-9.8)
self.logger.info("Initialising model")
displDist = 2.0
a = self.gravAcceleration.norm()
timeStepSize = math.sqrt(displDist/a)/(2.0*numTimeSteps)
self.initVerletModel(
particleType = "NRotSphere",
gridSpacing = 4.0,
verletDist = displDist
)
self.setTimeStepSize(dt = timeStepSize)
def getSimTime(self):
return self.getNumTimeSteps()*self.getTimeStepSize()
def createParticles(self):
"""
Creates a regularly packed block of particles within
the model.
"""
#
# Create a block of regular packed particles.
#
blk = Util.getSimpleBlock(self.numParticles, radius=1.0)
#
# Now determine how far particles will displace under
# gravitational acceleration and set the rectangular
# simulation domain accordingly.
#
blkBox = blk.getParticleBBox()
maxDisplacement = \
self.gravAcceleration*self.getSimTime()*self.getSimTime()
self.logger.info("Max displacement = {0:f}".format(maxDisplacement.norm()))
absDisplacement = Vec3([abs(maxDisplacement[i]) for i in range(0,3)])
domainBox = \
BoundingBox(
blkBox.getMinPt() - absDisplacement,
blkBox.getMaxPt() + absDisplacement
)
self.logger.info("Setting spatial domain.")
self.setSpatialDomain(domainBox)
#
# Finally create the model particles.
#
self.logger.info("Creating model particles.")
LsmMpi.createParticles(self,blk)
def createGravity(self):
"""
Creates the gravitational body-force within the model.
"""
self.logger.info("Creating gravity interaction group.")
self.createInteractionGroup(
GravityPrms(
name="9.8m/s",
acceleration = self.gravAcceleration
)
)
def runSimulation(self):
self.createParticles()
self.createGravity()
self.doTimedRun()
def runSimulations(
numTimeSteps,
numParticlesList,
outputFileName,
spawnCmdLineList,
verboseLsm
):
suite = Util.SimSuite(GravitySim)
suite.createSims(
numTimeSteps,
numParticlesList,
outputFileName,
spawnCmdLineList,
verboseLsm
)
suite.runSimulations()
if (__name__ == "__main__"):
parser = Util.getOptionParser()
(options, argList) = parser.parse_args()
runSimulations(
options.numTimeSteps,
options.numParticlesList,
options.outputFileName,
options.spawnCmdLineList,
options.verboseLsm
)
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