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importfistrAvsResults.py
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importfistrAvsResults.py
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# ***************************************************************************
# * Copyright (c) 2013 Joachim Zettler *
# * Copyright (c) 2013 Juergen Riegel <[email protected]> *
# * Copyright (c) 2016 Bernd Hahnebach <[email protected]> *
# * Copyright (c) 2020 FrontISTR Commons <https://www.frontistr.com/> *
# * *
# * This file is part of the FreeCAD CAx development system. *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * 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 Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with this program; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
__title__ = "Result import for FrontISTR Avs file format"
__author__ = "FrontISTR Commons"
__url__ = "https://www.frontistr.com/"
## @package importfistrAvsResults
# \ingroup FEM
# \brief FreeCAD FrontISTR AVS Reader for FEM workbench
import os
import FreeCAD
from FreeCAD import Console
# ********* generic FreeCAD import and export methods *********
if open.__module__ == "__builtin__":
# because we'll redefine open below (Python2)
pyopen = open
elif open.__module__ == "io":
# because we'll redefine open below (Python3)
pyopen = open
def open(filename):
"called when freecad opens a file"
docname = os.path.splitext(os.path.basename(filename))[0]
insert(filename, docname)
def insert(
filename,
docname
):
"called when freecad wants to import a file"
try:
doc = FreeCAD.getDocument(docname)
except NameError:
doc = FreeCAD.newDocument(docname)
FreeCAD.ActiveDocument = doc
importAvs(filename)
# ********* module specific methods *********
def importAvs(
filename,
analysis=None,
result_name_prefix=""
):
import ObjectsFem
from feminout import importToolsFem
TUNE=False
if TUNE:
import time
cur = time.time()
if analysis:
doc = analysis.Document
else:
doc = FreeCAD.ActiveDocument
m = read_avs_result(filename)
result_mesh_object = None
res_obj = None
if TUNE:
new = time.time(); Console.PrintMessage("dtime 1:"+'%8.3f'%(new-cur)+"\n") ; cur = new
if len(m["Nodes"]) > 0:
mesh = importToolsFem.make_femmesh(m)
if TUNE:
new = time.time(); Console.PrintMessage("dtime 2:"+'%8.3f'%(new-cur)+"\n") ; cur = new
result_mesh_object = ObjectsFem.makeMeshResult(
doc,
"ResultMesh"
)
result_mesh_object.FemMesh = mesh
res_mesh_is_compacted = False
nodenumbers_for_compacted_mesh = []
number_of_increments = len(m["Results"])
Console.PrintLog(
"Increments: " + str(number_of_increments) + "\n"
)
if TUNE:
new = time.time(); Console.PrintMessage("dtime 3:"+'%8.3f'%(new-cur)+"\n") ; cur = new
if len(m["Results"]) > 0:
for result_set in m["Results"]:
if "number" in result_set:
eigenmode_number = result_set["number"]
else:
eigenmode_number = 0
step_time = result_set["time"]
step_time = round(step_time, 2)
if eigenmode_number > 0:
results_name = (
"{}Mode{}_Results"
.format(result_name_prefix, eigenmode_number)
)
elif number_of_increments > 1:
results_name = (
"{}Time{}_Results"
.format(result_name_prefix, step_time)
)
else:
results_name = (
"{}Results"
.format(result_name_prefix)
)
if TUNE:
new = time.time(); Console.PrintMessage("dtime 4:"+'%8.3f'%(new-cur)+"\n") ; cur = new
res_obj = ObjectsFem.makeResultMechanical(doc, results_name)
res_obj.Mesh = result_mesh_object
if TUNE:
new = time.time(); Console.PrintMessage("dtime 5:"+'%8.3f'%(new-cur)+"\n") ; cur = new
res_obj = importToolsFem.fill_femresult_mechanical(res_obj, result_set)
if analysis:
# need to be here, becasause later on, the analysis objs are needed
# see fill of principal stresses
analysis.addObject(res_obj)
if TUNE:
new = time.time(); Console.PrintMessage("dtime 6:"+'%8.3f'%(new-cur)+"\n") ; cur = new
# more result object calculations
from femresult import resulttools
from femtools import femutils
if not res_obj.MassFlowRate:
if res_mesh_is_compacted is False:
# first result set, compact FemMesh and NodeNumbers
res_obj = resulttools.compact_result(res_obj)
res_mesh_is_compacted = True
nodenumbers_for_compacted_mesh = res_obj.NodeNumbers
else:
# all other result sets, do not compact FemMesh, only set NodeNumbers
res_obj.NodeNumbers = nodenumbers_for_compacted_mesh
if TUNE:
new = time.time(); Console.PrintMessage("dtime 7:"+'%8.3f'%(new-cur)+"\n") ; cur = new
# fill DisplacementLengths
res_obj = resulttools.add_disp_apps(res_obj)
if TUNE:
new = time.time(); Console.PrintMessage("dtime 8:"+'%8.3f'%(new-cur)+"\n") ; cur = new
# fill vonMises
mstress = []
for nid in res_obj.NodeNumbers:
mstress.append(result_set["mises"][nid])
res_obj.vonMises = mstress
if TUNE:
new = time.time(); Console.PrintMessage("dtime 9:"+'%8.3f'%(new-cur)+"\n") ; cur = new
# fill principal stress
prinstress1 = []; prinstress2 = []; prinstress3 = []
for nid in res_obj.NodeNumbers:
pstr = result_set["pstress"][nid]
prinstress1.append(pstr[0])
prinstress2.append(pstr[1])
prinstress3.append(pstr[2])
res_obj.PrincipalMax = prinstress1
res_obj.PrincipalMed = prinstress2
res_obj.PrincipalMin = prinstress3
# fill Stats
res_obj = resulttools.fill_femresult_stats(res_obj)
if TUNE:
new = time.time(); Console.PrintMessage("dtime10:"+'%8.3f'%(new-cur)+"\n") ; cur = new
else:
error_message = (
"Nodes, but no results found in avs file. "
"It means there only is a mesh but no results in avs file. "
"Usually this happens for: \n"
"- analysis type 'NOANALYSIS'\n"
"- if FrontISTR returned no results "
"(happens on nonpositive jacobian determinant in at least one element)\n"
"- just no avs results where requestet in input file "
"(neither 'node file' nor 'el file' in output section')\n"
)
Console.PrintWarning(error_message)
# create a result obj, even if we have no results but a result mesh in avs file
# see error message above for more information
if not res_obj:
if result_name_prefix:
results_name = ("{}_Results".format(result_name_prefix))
else:
results_name = ("Results".format(result_name_prefix))
res_obj = ObjectsFem.makeResultMechanical(doc, results_name)
res_obj.Mesh = result_mesh_object
# TODO, node numbers in result obj could be set
if analysis:
analysis.addObject(res_obj)
if FreeCAD.GuiUp:
if analysis:
import FemGui
FemGui.setActiveAnalysis(analysis)
doc.recompute()
if TUNE:
new = time.time(); Console.PrintMessage("dtime11:"+'%8.3f'%(new-cur)+"\n") ; cur = new
else:
Console.PrintError(
"Problem on avs file import. No nodes found in avs file.\n"
)
# None will be returned
# or would it be better to raise an exception if there are not even nodes in avs file?
return res_obj
def make_hash_tri(surf):
tmp = [surf[0],surf[1],surf[2]]
tmp.sort()
return str(tmp[0])+"%"+str(tmp[1])+"%"+str(tmp[2])
def extract_surface(nodes,elements_tetra10,elements_tetra4,elements_tria6,elements_tria3):
used_nid = []
# extract surface of tetra10 elements
table_tri6 = {}
for eid in elements_tetra10.keys():
ve = elements_tetra10[eid]
s = []
s.append((ve[0],ve[1],ve[2],ve[4],ve[5],ve[6]))
s.append((ve[0],ve[3],ve[1],ve[7],ve[8],ve[4]))
s.append((ve[1],ve[3],ve[2],ve[8],ve[9],ve[5]))
s.append((ve[2],ve[3],ve[0],ve[9],ve[7],ve[6]))
for i in range(4):
hash = make_hash_tri(s[i])
try:
table_tri6[hash].append(s[i])
except:
table_tri6[hash] = [s[i]]
count = 0
for k in table_tri6.keys():
if len(table_tri6[k]) == 1:
if len(table_tri6[k][0]) == 6:
count += 1
elements_tria6[count] = table_tri6[k][0]
for nid in elements_tria6[count]:
used_nid.append(nid)
# extract surface of tetra4 elements
table_tri3 = {}
for eid in elements_tetra4.keys():
ve = elements_tetra4[eid]
s = []
s.append((ve[0],ve[1],ve[2]))
s.append((ve[0],ve[3],ve[1]))
s.append((ve[1],ve[3],ve[2]))
s.append((ve[2],ve[3],ve[0]))
for i in range(4):
hash = make_hash_tri(s[i])
try:
table_tri3[hash].append(s[i])
except:
table_tri3[hash] = [s[i]]
for k in table_tri3.keys():
if len(table_tri3[k]) == 1:
count += 1
elements_tria3[count] = table_tri3[k][0]
for nid in elements_tria3[count]:
used_nid.append(nid)
used_nid = list(set(used_nid))
newnodes = {}
for nid in used_nid:
newnodes[nid] = nodes[nid]
nodes = newnodes
def renumber_nid(nodes):
Renumbered_nid = {}
count = 0
nodes_old = nodes.copy()
nodes = {}
for nid in list(nodes_old.keys()):
count += 1
Renumbered_nid[nid] = count
nodes[count] = nodes_old[nid]
return nodes, Renumbered_nid
def renumber_eid(Renumbered_nid,elements_tria6,elements_tria3):
Renumbered_eid = {}
count = 0
elements_tria6_new = {}
for eid in list(elements_tria6.keys()):
count += 1
Renumbered_eid[eid] = count
nodelist = []
for nid in elements_tria6[eid]:
nodelist.append(Renumbered_nid[nid])
elements_tria6_new[count] = nodelist
elements_tria3_new = {}
for eid in list(elements_tria3.keys()):
count += 1
Renumbered_eid[eid] = count
nodelist = []
for nid in elements_tria3[eid]:
nodelist.append(Renumbered_nid[nid])
elements_tria3_new[count] = nodelist
return elements_tria6_new, elements_tria3_new, Renumbered_eid
# read a FrontISTR result file and extract the nodes
# displacement vectors and stress values.
def read_avs_result(
avs_input
):
Console.PrintMessage(
"Read fistr results from complete avs file: {}\n"
.format(avs_input)
)
if os.path.exists(avs_input):
avs_file = pyopen(avs_input, "r")
else:
Console.PrintMessage(avs_input+" not found.")
nodes = {}
elements_hexa8 = {}
elements_penta6 = {}
elements_tetra4 = {}
elements_tetra10 = {}
elements_penta15 = {}
elements_hexa20 = {}
elements_tria3 = {}
elements_tria6 = {}
elements_quad4 = {}
elements_quad8 = {}
elements_seg2 = {}
elements_seg3 = {}
results = []
mode_results = {}
mode_results["number"] = float("NaN")
mode_results["time"] = float("NaN")
mode_disp = {}
mode_stress = {}
mode_mises = {}
mode_pstress = {}
mode_strain = {}
mode_peeq = {}
mode_temp = {}
mode_massflow = {}
mode_networkpressure = {}
dat = avs_file.readlines()
avs_file.close()
dat.reverse()
for i in range(3):
dat.pop()
n_nodes, n_elems = map(int, dat.pop().split(" "))
#read nodes
for i in range(n_nodes):
line = list(filter(None, dat.pop().split(" ")))
nid = int(line[0])
nodes_x = float(line[1])
nodes_y = float(line[2])
nodes_z = float(line[3])
nodes[nid] = FreeCAD.Vector(nodes_x, nodes_y, nodes_z)
#read elements
for i in range(n_elems):
line = list(filter(None, dat.pop().split(" ")))
eid = int(line[0])
etype = line[2]
if etype == 'tet2':
nd1 = int(line[3])
nd2 = int(line[4])
nd3 = int(line[5])
nd4 = int(line[6])
nd5 = int(line[7])
nd6 = int(line[8])
nd7 = int(line[9])
nd8 = int(line[10])
nd9 = int(line[11])
nd10 = int(line[12])
elements_tetra10[eid] = (nd2, nd1, nd4, nd3, nd5, nd7, nd10, nd8, nd6, nd9)
elif etype == 'tet':
nd1 = int(line[3])
nd2 = int(line[4])
nd3 = int(line[5])
nd4 = int(line[6])
elements_tetra4[eid] = (nd2, nd1, nd4, nd3)
# Extract surface
extract_surface(nodes,elements_tetra10,elements_tetra4,elements_tria6,elements_tria3)
elements_tetra10 = {}
elements_tetra4 = {}
# Renumber for pipeline view
nodes, Renumbered_nid = renumber_nid(nodes)
elements_tria6, elements_tria3, Renumbered_eid = renumber_eid(Renumbered_nid,elements_tria6,elements_tria3)
n_noderes, n_elemres = map(int, list(filter(None, dat.pop().split(" "))))
if n_noderes > 0 :
dofs = list(map(int, list(filter(None, dat.pop().split(" ")))))
n_dofs = dofs[0]
dofs[0] = 0
for i in range(n_dofs):
dofs[i+1] = dofs[i+1]+dofs[i]
labels = []
nresults = {}
for i in range(n_dofs):
tmp = dat.pop().split(",")[0].replace(" ","")
labels.append(tmp)
nresults[tmp] = {}
for i in range(n_nodes):
line = list(filter(None, dat.pop().split(" ")))
nid = int(line[0])
linedat = list(map(float,line[1:n_noderes+1]))
for j in range(n_dofs):
nresults[labels[j]][Renumbered_nid[nid]] = linedat[dofs[j]:dofs[j+1]]
# displacement
for nid in nodes.keys():
disp = nresults['DISPLACEMENT'][nid]
mode_disp[nid] = FreeCAD.Vector(disp[0],disp[1],disp[2])
# NodalSTRESS
for nid in nodes.keys():
stress = nresults['NodalSTRESS'][nid]
mode_stress[nid] = (stress[0],stress[1],stress[2],stress[3],stress[5],stress[4])
# NodalMises
for nid in nodes.keys():
mises = nresults['NodalMISES'][nid][0]
mode_mises[nid] = mises
# NodalPrincipalSTRESS
for nid in nodes.keys():
pstr = nresults['NodalPrincipalSTRESS'][nid]
mode_pstress[nid] = pstr
n_nodes = len(nodes.keys())
n_elems = len(elements_tria3.keys())+len(elements_tria6.keys())
mode_results["disp"] = mode_disp
mode_results["stress"] = mode_stress
mode_results["mises"] = mode_mises
mode_results["pstress"] = mode_pstress
results.append(mode_results)
return {
"Nodes": nodes,
"Seg2Elem": elements_seg2,
"Seg3Elem": elements_seg3,
"Tria3Elem": elements_tria3,
"Tria6Elem": elements_tria6,
"Quad4Elem": elements_quad4,
"Quad8Elem": elements_quad8,
"Tetra4Elem": elements_tetra4,
"Tetra10Elem": elements_tetra10,
"Hexa8Elem": elements_hexa8,
"Hexa20Elem": elements_hexa20,
"Penta6Elem": elements_penta6,
"Penta15Elem": elements_penta15,
"Results": results
}