#
##
## This file is part of pyFormex 2.0 (Mon Sep 14 12:29:05 CEST 2020)
## pyFormex is a tool for generating, manipulating and transforming 3D
## geometrical models by sequences of mathematical operations.
## Home page: http://pyformex.org
## Project page: http://savannah.nongnu.org/projects/pyformex/
## Copyright 2004-2020 (C) Benedict Verhegghe (benedict.verhegghe@ugent.be)
## Distributed under the GNU General Public License version 3 or later.
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see http://www.gnu.org/licenses/.
##
"""
Interface with flavia FE result files.
(C) 2010 Benedict Verhegghe.
"""
import shlex
import numpy as np
import pyformex.arraytools as at
from pyformex.plugins.fe import Model
from pyformex.plugins.fe_post import FeResult
element_type_translation = {
'quadrilateral': {
4: 'quad4',
8: 'quad8',
9: 'quad9',
},
}
element_results_count = {
'vector': {
2: 2,
3: 3,
},
'matrix': {
2: 3,
3: 6,
},
}
######################### functions #############################
[docs]def readMesh(fn):
"""Read a flavia mesh file.
Returns a list of Meshes if successful.
"""
fil = open(fn, 'r')
meshes = []
for line in fil:
if line.startswith('#'):
continue
elif line.startswith('Mesh'):
s = shlex.split(line.lower())
s = dict(zip(s[0::2], s[1::2]))
print(s)
ndim = int(s['dimension'])
nplex = int(s['nnode'])
eltype = element_type_translation[s['elemtype']][nplex]
print("eltype = %s, ndim = %s" % (eltype, ndim))
elif line.startswith('Coordinates'):
coords = readCoords(fil, ndim)
print("Coords %s" % str(coords.shape))
elif line.startswith('Elements'):
elems, props = readElems(fil, nplex)
print("Elements %s %s" % (elems.shape, props.shape))
meshes.append((elems, props))
else:
print(line)
elems, props = [m[0] for m in meshes], [m[1] for m in meshes]
maxnod = max([e.max() for e in elems])
coords = coords[:maxnod+1]
return coords, elems, props, ndim
[docs]def readCoords(fil, ndim):
"""Read a set of coordinates from a flavia file"""
ncoords = 100
coords = np.zeros((ncoords, 3), dtype=at.Float)
for line in fil:
if line.startswith('End Coordinates'):
break
else:
s = line.split()
i = int(s[0])
x = [float(v) for v in s[1:]]
while i >= ncoords:
coords = at.growAxis(coords, ncoords, axis=0, fill=0.0)
ncoords = coords.shape[0]
coords[i-1, :ndim] = x
return coords
[docs]def readElems(fil, nplex):
"""Read a set of coordinates from a flavia file"""
nelems = 100
elems = np.zeros((nelems, nplex), dtype=at.Int)
props = np.zeros((nelems), dtype=at.Int)
for line in fil:
if line.startswith('End Elements'):
break
else:
s = line.split()
i = int(s[0])
e = [int(v) for v in s[1:nplex+1]]
p = int(s[nplex+1])
while i >= nelems:
elems = at.growAxis(elems, nelems, axis=0, fill=0)
props = at.growAxis(props, nelems, axis=0, fill=0)
nelems = elems.shape[0]
elems[i-1] = e
props[i-1] = p
defined = elems.sum(axis=1) > 0
return elems[defined]-1, props[defined]
[docs]def readResults(fn, nnodes, ndim):
"""Read a flavia results file for an ndim mesh.
"""
fil = open(fn, 'r')
results = {}
for line in fil:
if line.startswith('#'):
continue
elif line.startswith('Result'):
s = shlex.split(line.lower())
name = s[1]
restype = s[4]
domain = s[5]
print(domain)
if domain != 'onnodes':
print("Currently only results on nodes can be read")
print("Skipping %s %s" % (name, domain))
nres = 0
continue
nres = element_results_count[restype][ndim]
elif line.startswith('Values'):
if nres > 0:
result = readResult(fil, nnodes, nres)
print(name)
results[name] = result
else:
print(line)
return results
[docs]def readResult(fil, nvalues, nres):
"""Read a set of results from a flavia file"""
values = np.zeros((nvalues, nres), dtype=at.Float)
for line in fil:
if line.startswith('End Values'):
break
else:
s = line.split()
i = int(s[0])
x = [float(v) for v in s[1:]]
values[i-1] = x
return values
[docs]def createFeResult(model, results):
"""Create an FeResult from meshes and results"""
DB = FeResult()
DB.nodes = model.coords
DB.nnodes = model.coords.shape[0]
DB.nodid = np.arange(DB.nnodes)
DB.elems = dict(enumerate(model.elems))
DB.nelems = model.celems[-1]
DB.Finalize()
ndisp = results['displacement'].shape[1]
nstrs = results['stress'].shape[1]
DB.datasize['U'] = ndisp
DB.datasize['S'] = nstrs
for lc in range(1): # currently only 1 step
DB.Increment(lc, 0)
DB.R['U'] = results['displacement']
DB.R['S'] = results['stress']
return DB
[docs]def readFlavia(meshfile, resfile):
"""Read flavia results files
Currently we only read matching pairs of meshfile,resfile files.
"""
if meshfile:
coords, elems, props, ndim = readMesh(meshfile)
if resfile:
R = readResults(resfile, coords.shape[0], ndim)
M = Model(coords, elems)
DB = createFeResult(M, R)
DB.printSteps()
return DB
if __name__ == '__draw__':
from pyformex.gui.draw import chdir, Path, draw
chdir('/home/bene/prj/pyformex')
name = 'FeResult-001'
meshfile = Path(name+'.flavia.msh')
resfile = meshfile.with_suffix('.res')
M = readMesh(meshfile)
print(M.coords.shape, M.elems.shape)
print(M.coords, M.elems)
draw(M)
R = readResults(resfile, M)
DB = createFeResult(M, R)
DB.printSteps()
print(DB.R)
print(DB.datasize)
DB1 = FeResult()
print(DB1.datasize)
for key in ['U0', 'U1', 'U2', 'U3']:
v = DB.getres(key)
if v is not None:
print("%s: %s" % (key, v.shape))
# End
