A Python
script for Groups Manipulation
Purpose of the script
The script illustrates the reading of Nastran model
from BDF file, of groups from a Patran session file, and of the manipulation of
these Groups with FeResPost Python extension.
Script
from FeResPost import *
import sys
os=sys.stdout
# Reads the Groups into a Hash :
h=Post.readGroupsFromPatranSession("../../MODEL/PATRAN/groups.ses")
print(h)
# Prints Groups' data :
nbrEntitiesPerLine=8
for id,grp in h.items():
os.write("Group \"%s\":\n"%id)
nbr=grp.getNbrEntitiesByType("Element")
os.write(" Nbr Elements: %d"%nbr)
counter=0
for id in grp.iter_element():
if counter%nbrEntitiesPerLine==0:
os.write("\n ")
os.write("%8d"%id)
counter+=1
os.write("\n\n")
nbr=grp.getNbrEntitiesByType("MPC")
os.write(" Nbr MPCs: %d"%nbr)
counter=0
for id in grp.iter_mpc():
if counter%nbrEntitiesPerLine==0:
os.write("\n ")
os.write("%8d"%id)
counter+=1
os.write("\n\n")
nbr=grp.getNbrEntitiesByType("Node")
os.write(" Nbr Nodes: %d"%nbr)
counter=0
for id in grp.iter_node():
if counter%nbrEntitiesPerLine==0:
os.write("\n ")
os.write("%8d"%id)
counter+=1
os.write("\n\n")
nbr=grp.getNbrEntitiesByType("CoordSys")
os.write(" Nbr CoordSys: %d"%nbr)
counter=0
for id in grp.iter_coordsys():
if counter%nbrEntitiesPerLine==0:
os.write("\n ")
os.write("%8d"%id)
counter+=1
os.write("\n\n")
Explanation
The different steps of the Nastran FEM importation
are:
- The access to FeResPost
compiled library.
- In this example, no NastranDb
object is created. The groups are directly read into a dictionary using
``readGroupsFromPatranSession'' method of ``Post'' Module.
- The lines that follow simply
write in a text file the list of entities found in each Group (elements,
MPCs, nodes and coordinate systems).
References
More information on this example, and the manual
explaining the functions used in this example are given in FeResPost
Reference Manual.
