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test.py
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test.py
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#!/usr/bin/env python
""" Convergence study for solid elements """
import os
import multiprocessing
import matplotlib.pyplot as plt
import numpy
import shutil
# Provide access to the helper scripts
def modify_path():
scripts_dir = os.path.dirname(__file__)
while not 'Scripts' in os.listdir(scripts_dir):
scripts_dir = os.path.abspath(os.path.join(scripts_dir, '..'))
scripts_dir = os.path.join(scripts_dir, 'Scripts')
if not scripts_dir in os.environ['PATH']:
os.environ['PATH'] += os.pathsep + scripts_dir
print('\nPATH = {}\n'.format(os.environ['PATH']))
# Runs a convergence study
def shell_conv():
# Calculix solid element types with their cgx counterparts
eltyps={"S3":"tr3u",
"S4":"qu4",
"S4R":"qu4r",
"S6":"tr6u",
"S8":"qu8",
"S8R":"qu8r"}
#elsizes=[50,20,10,5]
# C3D4 mesh fails for those elsize
#elsizes=[500,250,100,50,25,10,5]
elsizes=[100,50,25,10,5]
# read the template fbd file
f = open("shell.fbd","r")
lines=f.readlines()
f.close()
# loop over element types
for elty in eltyps.keys():
# open results summary file
fdata=open(elty+".txt","w")
fdata.write("# size NoN smax umax\n")
# loop over element sizes
for elsize in elsizes:
print(elty, elsize)
# modify shell.fbd and write output to shell-auto.fbd
fout = open("shell_auto.fbd", "w")
for line in lines:
# set element type
if line.startswith("valu Etyp"):
line="valu Etyp "+eltyps[elty]+"\n"
# set element size
if line.startswith("div all auto"):
line="div all auto "+str(elsize)+"\n"
if elty.startswith("S3") or elty.startswith("S4"):
# increase the node distance for linear elements
line=line+"div all div 2\n"
elsize=elsize*2
fout.write("ulin "+elty+" "+str(elsize)+"\n")
fout.write(line)
fout.write("quit\n")
fout.close()
# run shell_auto.fbd (preprocessing, solving and postprocessing)
os.system("cgx -b shell_auto.fbd")
# get number of nodes from solid.frd
f=open("shell.frd")
for line in f:
if line.startswith(" 2C"):
nnode=int(line.split()[1])
f.close()
print("Knotenzahl ", nnode)
# get smax from smax.txt
smax=numpy.genfromtxt("smax.txt")[3]
# get umax from umax.txt
smin=numpy.genfromtxt("smin.txt")[3]
# get umax from umax.txt
umax=numpy.genfromtxt("umax.txt")[3]
# rename the stress plot
os.system("mv hcpy_1.png "+"shell_"+elty+"_"+str(elsize)+"_S.png")
# write the values to the data file
fdata.write(str(elsize)+" "+str(nnode)+" "+str((smax-smin)/2.)+" "+str(abs(umax))+"\n")
fdata.close()
# Plots the results of a convergence study
def shell_plot():
# reference values, see smath sheet
sref=1.848
wref=0.0587
# List of the element types to process (text files)
eltyps=["S3",
"S4",
"S4R",
"S6",
"S8",
"S8R"]
plt.figure(figsize=(10, 5.0), dpi=100)
plt.subplot(1,2,1)
plt.title("Stress")
# plt.hold(True) # deprecated
for elty in eltyps:
data = numpy.genfromtxt(elty+".txt")
plt.plot(data[:,1],data[:,2]/sref,"o-")
plt.xscale("log")
plt.xlabel('Number of nodes')
plt.ylabel('Max $\sigma / \sigma_{\mathrm{ref}}$')
plt.grid(True)
plt.subplot(1,2,2)
plt.title("Displacement")
# plt.hold(True) # deprecated
for elty in eltyps:
data = numpy.genfromtxt(elty+".txt")
plt.plot(data[:,1],data[:,3]/wref,"o-")
plt.xscale("log")
plt.xlabel('Number of nodes')
plt.ylabel('Max $u / u_{\mathrm{ref}}$')
plt.ylim([0,1.2])
plt.grid(True)
plt.legend(eltyps,loc="lower right")
plt.tight_layout()
plt.savefig("shell.svg",format="svg")
plt.show()
# Move new files and folders to 'Refs'
def move(old_snap):
new_snap = os.listdir(os.curdir)
if not os.path.exists('Refs'):
os.mkdir('Refs')
for f in new_snap:
if not f in old_snap:
fname = os.path.basename(f)
new_name = os.path.join(os.curdir, 'Refs', fname)
if os.path.isfile(new_name):
os.remove(new_name)
if os.path.isdir(new_name):
shutil.rmtree(new_name)
os.rename(f, new_name)
if __name__ == '__main__':
# Enable multithreading for ccx
os.environ['OMP_NUM_THREADS'] = str(multiprocessing.cpu_count())
# Explicitly move to example's directory
os.chdir(os.path.dirname(__file__))
# Run the example
modify_path()
snap = os.listdir(os.curdir)
os.system("")
shell_conv()
shell_plot()
#move(snap)