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FRDParser.py
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FRDParser.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
© Lukas Bante, Sep 2017 - original code https://gitlab.lrz.de/snippets/238
© Ihor Mirzov, Jan 2020 - bugfix, refactoring and improvement
Distributed under GNU General Public License v3.0
This module contains classes for parsing CalculiX .frd files """
import os
import re
import logging
import math
# A single node object
class Node:
def __init__(self, num, coords):
self.num = num
self.coords = coords
# A single finite element object
class Element:
def __init__(self, num, etype, nodes):
self.num = num
self.type = etype
self.nodes = nodes
# Nodal Point Coordinate Block
# cgx_2.15 Manual, § 11.3
class NodalPointCoordinateBlock:
# Read nodal coordinates
def __init__(self, in_file):
line = readByteLine(in_file)
self.nodes = {} # dictionary with nodes {num:Node}
while True:
line = readByteLine(in_file)
# End of block
if line == '-3':
break
regex = '^-1(.{10})' + '(.{12})'*3
match = parseLine(regex, line)
node_number = int(match.group(1))
node_coords = [ float(match.group(2)),
float(match.group(3)),
float(match.group(4)), ]
self.nodes[node_number] = Node(node_number, node_coords)
logging.debug('Node {}: {}'.format(node_number, node_coords))
self.numnod = len(self.nodes) # number of nodes in this block
logging.info('{} nodes'.format(self.numnod)) # total number of nodes
# Element Definition Block
# cgx_2.15 Manual, § 11.4
class ElementDefinitionBlock:
# Parse elements
def __init__(self, in_file):
self.in_file = in_file
line = readByteLine(in_file)
self.elements = [] # list of Element objects
while True:
line = readByteLine(in_file)
# End of block
if line == '-3':
break
self.parseElement(line)
self.numelem = len(self.elements) # number of elements in this block
logging.info('{} cells'.format(self.numelem)) # total number of elements
# Read element composition
def parseElement(self, line):
"""
-1 1 1 0AIR
-2 1 2 3 4 5 6 7 8
-1 1 10 0 1
-2 1 2 3 4 5 6 7 8
-1 2 11 0 2
-2 9 10
-1 3 12 0 2
-2 10 12 11
"""
element_num = int(line.split()[1])
element_type = int(line.split()[2])
element_nodes = []
num_nodes = self.amount_of_nodes_in_frd_element(element_type)
for j in range(self.num_lines(element_type)):
line = readByteLine(self.in_file)
nodes = [int(n) for n in line.split()[1:]]
element_nodes.extend(nodes)
elem = Element(element_num, element_type, element_nodes)
self.elements.append(elem)
logging.debug('Element {}: {}'.format(element_num, element_nodes))
# Amount of nodes in frd element
def amount_of_nodes_in_frd_element(self, etype):
# First value is meaningless, since elements are 1-based
return (0, 8, 6, 4, 20, 15, 10, 3, 6, 4, 8, 2, 3)[etype]
# Amount of lines in element connectivity definition
def num_lines(self, etype):
# First value is meaningless, since elements are 1-based
return (0, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1)[etype]
# Nodal Results Block
# cgx_2.15 Manual, § 11.6
class NodalResultsBlock:
# Read calculated values
def __init__(self, in_file, node_block):
self.in_file = in_file
self.node_block = node_block
self.components = [] # component names
self.results = {} # dictionary with nodal result {node:data}
self.readStepInfo()
self.readVarsInfo()
self.readComponentsInfo()
results_counter = self.readNodalResults()
self.appendStresses() # append Mises and principal stresses
self.appendStrains() # append principal strains
if self.value < 1:
time_str = 'time {:.2e}, '.format(self.value)
else:
time_str = 'time {:.1f}, '.format(self.value)
logging.info('Step {}, '.format(self.numstep) +\
time_str +\
'{}, '.format(self.name) +\
'{} components, '.format(len(self.components)) +\
'{} values'.format(results_counter))
# Read step information
def readStepInfo(self):
"""
CL 101 0.36028E+01 320 3 1 1
CL 101 1.000000000 803 0 1 1
CL 101 1.000000000 32 0 1 1
CL 102 117547.9305 90 2 2MODAL 1
"""
line = readByteLine(self.in_file)[7:]
regex = '^(.{12})\s+\d+\s+\d+\s+(\d+)'
match = parseLine(regex, line)
self.value = float(match.group(1)) # could be frequency, time or any numerical value
self.numstep = int(match.group(2)) # step number
# Read variables information
def readVarsInfo(self):
"""
-4 V3DF 4 1
-4 DISP 4 1
-4 STRESS 6 1
-4 DOR1 Rx 4 1
"""
line = readByteLine(self.in_file)[4:]
regex = '^(\w+)' + '\D+(\d+)'*2
match = parseLine(regex, line)
self.ncomps = int(match.group(2)) # amount of components
# Rename result block to the name from .inp-file
inpname = {
'DISP':'U',
'NDTEMP':'NT',
'STRESS':'S',
'TOSTRAIN':'E',
'FORC':'RF',
'PE':'PEEQ',
}
self.name = match.group(1) # dataset name
if self.name in inpname:
self.name = inpname[self.name]
# Iterate over components
def readComponentsInfo(self):
"""
-5 D1 1 2 1 0
-5 D2 1 2 2 0
-5 D3 1 2 3 0
-5 ALL 1 2 0 0 1ALL
-5 DFDN 1 1 1 0
-5 DFDNFIL 1 1 2 0
-5 V1 1 2 1 0
-5 V2 1 2 2 0
-5 V3 1 2 3 0
-5 ALL 1 2 0 0 1ALL
-5 SXX 1 4 1 1
-5 SYY 1 4 2 2
-5 SZZ 1 4 3 3
-5 SXY 1 4 1 2
-5 SYZ 1 4 2 3
-5 SZX 1 4 3 1
"""
for i in range(self.ncomps):
line = readByteLine(self.in_file)[4:]
regex = '^\w+'
match = parseLine(regex, line)
# Exclude variable name from the component name: SXX->xx, EYZ->yz
component_name = match.group(0)
if component_name.startswith(self.name):
component_name = component_name[len(self.name):].lower()
if 'ALL' in component_name:
self.ncomps -= 1
else:
self.components.append(component_name)
# Iterate over nodal results
def readNodalResults(self):
"""
-1 1-7.97316E+10-3.75220E-01
-1 2-8.19094E+10-3.85469E-01
-1 1-6.93889E-18-9.95185E-01-4.66908E-34
-1 2-1.94151E-01-9.76063E-01 6.46011E-30
-1 1 1.47281E+04 1.39140E+04 2.80480E+04 5.35318E+04 6.36642E+03 1.82617E+03
-2 5.31719E+01 6.69780E+01 2.76244E+01 2.47686E+01 1.99930E+02 2.14517E+02
"""
# Fill data with zeroes - sometimes FRD result block has only non zero values
for node_num in self.node_block.nodes.keys():
self.results[node_num] = [0]*self.ncomps
# Some warnings repeat too much time - mark them
before = ''
after = None
emitted_warning_types = {'NaNInf':0, 'WrongFormat':0}
results_counter = 0 # independent results counter
while True:
line = readByteLine(self.in_file)
# End of block
if line == '-3':
break
row_comps = min(6, self.ncomps) # amount of values written in row
regex = '^-1\s+(\d+)' + '(.{12})' * row_comps
match = parseLine(regex, line)
node = int(match.group(1))
data = []
for c in range(row_comps):
m = match.group(c + 2)
try:
# NaN/Inf values will be parsed
num = float(m)
if ('NaN' in m or 'Inf' in m):
emitted_warning_types['NaNInf'] += 1
except Exception as e:
# Too big number is written without 'E'
num = float(re.sub(r'(.+).([+-])(\d{3})', r'\1e\2\3', m))
emitted_warning_types['WrongFormat'] += 1
before = m
after = num
data.append(num)
results_counter += 1
self.results[node] = data
# Result could be multiline
for j in range((self.ncomps-1)//6):
row_comps = min(6, self.ncomps-6*(j+1)) # amount of values written in row
line = readByteLine(self.in_file)
regex = '^-2\s+' + '(.{12})' * row_comps
match = parseLine(regex, line)
data = [float(match.group(c+1)) for c in range(row_comps)]
self.results[node].extend(data)
logging.debug('Node {}: {}'.format(node, self.results[node]))
if emitted_warning_types['NaNInf']:
logging.warning('NaN and Inf are not supported in Paraview ({} warnings).'\
.format(emitted_warning_types['NaNInf']))
if emitted_warning_types['WrongFormat']:
logging.warning('Wrong format, {} -> {} ({} warnings).'\
.format(before.strip(), after, emitted_warning_types['WrongFormat']))
return results_counter
# Append Mises and principal stresses
def appendStresses(self):
if self.name == 'S':
try:
# Check if numpy is installed
import numpy as np
# component_names = (
# 'Mises',
# 'Max Principal',
# 'Mid Principal',
# 'Min Principal',
# 'Tresca',
# 'Pressure',
# 'Third Invariant'
# )
component_names = (
'Mises',
'Min Principal',
'Mid Principal',
'Max Principal',
)
for i in range(len(component_names)):
# c = Component()
# c.ictype = 1; c.name = component_names[i]
self.components.append(component_names[i])
self.ncomps += 1
# Iterate over nodes
for node_num in self.node_block.nodes.keys():
data = self.results[node_num] # list with results for current node
Sxx = data[0]; Syy = data[1]; Szz = data[2]
Sxy = data[3]; Syz = data[4]; Szx = data[5]
tensor = np.array([[Sxx, Sxy, Szx], [Sxy, Syy, Syz], [Szx, Syz, Szz]])
# Calculate Mises stress for current node
mises = 1 / math.sqrt(2) *\
math.sqrt( (Sxx - Syy)**2 +\
(Syy - Szz)**2 +\
(Szz - Sxx)**2 +\
6 * Syz**2 +\
6 * Szx**2 +\
6 * Sxy**2)
self.results[node_num].append(mises)
# Calculate principal stresses for current node
for ps in np.linalg.eigvalsh(tensor).tolist():
self.results[node_num].append(ps)
except ImportError:
logging.error('Numpy is not installed.\n' +\
'Additional stresses will not be appended.')
# Append principal strains
def appendStrains(self):
if self.name == 'E':
try:
# Check if numpy is installed
import numpy as np
component_names = (
'Mises',
'Min Principal',
'Mid Principal',
'Max Principal',
)
for i in range(len(component_names)):
# c = Component()
# c.ictype = 1; c.name = component_names[i]
self.components.append(component_names[i])
self.ncomps += 1
# Iterate over nodes
for node_num in self.node_block.nodes.keys():
data = self.results[node_num] # list with results for current node
Exx = data[0]; Eyy = data[1]; Ezz = data[2]
Exy = data[3]; Eyz = data[4]; Ezx = data[5]
tensor = np.array([[Exx, Exy, Ezx], [Exy, Eyy, Eyz], [Ezx, Eyz, Ezz]])
# Calculate Mises strain for current node
mises = math.sqrt(2)/3 *\
math.sqrt( (Exx - Eyy)**2 +\
(Eyy - Ezz)**2 +\
(Ezz - Exx)**2 +\
6 * Eyz**2 +\
6 * Ezx**2 +\
6 * Exy**2)
self.results[node_num].append(mises)
# Calculate principal strains for current node
for ps in np.linalg.eigvalsh(tensor).tolist():
self.results[node_num].append(ps)
except ImportError:
logging.error('Numpy is not installed.\n' +\
'Additional strains will not be appended.')
# Main class
class Parse:
# Read contents of the .frd file
def __init__(self, file_name=None):
self.file_name = None # path to the .frd-file to be read
self.node_block = None # node block
self.elem_block = None # elements block
self.result_blocks = [] # all result blocks in order of appearance
if file_name:
self.file_name = file_name
with open(file_name, 'rb') as in_file:
key = in_file.read(5).decode().strip()
while key:
# Header
if key == '1' or key == '1P':
readByteLine(in_file)
# Nodes
elif key == '2':
block = NodalPointCoordinateBlock(in_file)
self.node_block = block
# Elements
elif key == '3':
block = ElementDefinitionBlock(in_file)
self.elem_block = block
# Results
elif key == '100':
block = NodalResultsBlock(in_file, self.node_block)
self.result_blocks.append(block)
# End
elif key == '9999':
break
key = in_file.read(5).decode().strip()
# # Exclude zero nodes added by ccx due to *TRANSFORM
# nn = sorted(set([len(b.results) for b in self.result_blocks if len(b.results)>0]))
# if len(nn) == 3:
# self.node_block.numnod = nn[1]
# elif len(nn) == 2:
# self.node_block.numnod = nn[0]
# Read byte line and decode
def readByteLine(f):
try:
byte = f.read(1).decode()
except UnicodeDecodeError:
byte = ' '
line = byte
while byte != '\n':
try:
byte = f.read(1).decode()
except UnicodeDecodeError:
byte = ' '
line += byte
return line.strip()
# Read byte line and decode: return None after EOF
# TODO Use readByteLine from ccx_cae/src/model/parsers/mesh.py
# Parse regex in line and report problems
def parseLine(regex, line):
match = re.search(regex, line)
if match:
return match
else:
logging.error('Can\'t parse line:\n{}\nwith regex:\n{}'\
.format(line, regex))
raise Exception