I want to create a 3D cubic model with an internal inclined surface using a Python script in CUBIT software, apply CPML (Perfectly Matched Layer) boundary conditions to all boundaries, and generate all-hexahedral meshes. However, after running the code, the file free_or_absorbing_surface_file_zmax in the exported mesh files is empty. How can I modify the code to ensure all boundaries are correctly configured with CPML conditions?
The original code is as follows:
#!/usr/bin/env python
from __future__ import print_function
import cubit
cubit.init([""])
try:
from geocubitlib import boundary_definition
from geocubitlib import cubit2specfem3d
except:
import boundary_definition
import cubit2specfem3d
import os
import sys
cubit.cmd('reset')
# -------------------- Reset Cubit environment -------------------- #
# -------------------- Basic settings start -------------------- #
# cubit.cmd('view journal')
cubit.cmd('Timer Start')
cubit.cmd('clear')
cubit.cmd('Color Background white')
cubit.cmd('Color Axis Labels red')
cubit.cmd('graphics perspective off')
cubit.cmd('graphics parallel scale 303.79899')
cubit.cmd('from -2209.0335 -2399.8038 840.56353')
cubit.cmd('at 0 0 0')
cubit.cmd('up 0.15018128 0.20082845 0.96804624')
cubit.cmd('set duplicate block elements on')
# cubit.cmd('view right')
# cubit.cmd('up 0 0 1')
# cubit.cmd('view top')
# cubit.cmd('view bottom')
# cubit.cmd('view front')
cubit.cmd('view iso')
cubit.cmd('up 0 0 1')
# -------------------- Basic settings end -------------------- #
# -------------------- Mesh size & folder setup -------------------- #
elementsize = 4.0
path_folder = 'model_files_3D_20250803'
# -------------------- Define 3D geometry start -------------------- #
cubit.cmd('brick x 340 y 340 z 300')
cubit.cmd('move vol 1 x 170 y 170 z -150')
cubit.cmd('create planar surface zplane')
cubit.cmd('rotate volume 2 about Y angle -15.000000')
cubit.cmd('move volume 2 x 170 y 170 z -180')
cubit.cmd('webcut volume 1 with sheet extended from surface 7')
cubit.cmd('delete volume 2')
# -------------------- Define 3D geometry end -------------------- #
cubit.cmd('view iso')
cubit.cmd('up 0 0 1')
# -------------------- Set colors -------------------- #
cubit.cmd('color vol 1 id 4')
cubit.cmd('color vol 3 id 60')
# -------------------- Merge & mesh start -------------------- #
cubit.cmd('merge vol all')
cubit.cmd('imprint vol all')
cubit.cmd('volume all size ' + str(elementsize))
cubit.cmd('mesh volume all')
cubit.cmd('draw volume all')
# -------------------- Merge & mesh end -------------------- #
# -------------------- Define boundaries start -------------------- #
# cubit.cmd('block 1001 face in surface 1 68 69 70 72')
# # cubit.cmd('block 1001 face in surface 1')
# cubit.cmd('block 1001 name "face_topo"')
cubit.cmd('block 1002 face in surface 2')
cubit.cmd('block 1002 name "face_bottom"')
cubit.cmd('block 1003 face in surface 10 17')
cubit.cmd('block 1003 name "face_abs_xmin"')
cubit.cmd('block 1004 face in surface 11 16')
cubit.cmd('block 1004 name "face_abs_ymin"')
cubit.cmd('block 1005 face in surface 12 15')
cubit.cmd('block 1005 name "face_abs_xmax"')
cubit.cmd('block 1006 face in surface 9 14')
cubit.cmd('block 1006 name "face_abs_ymax"')
# -------------------- Define boundaries end -------------------- #
# -------------------- Block properties start -------------------- #
cubit.cmd('block 1 hex in volume 1 ')
cubit.cmd('block 1 name "elastic 1 " ')
cubit.cmd('block 1 attribute count 7')
cubit.cmd('block 1 attribute index 1 1 ')
cubit.cmd('block 1 attribute index 2 1800 ')
cubit.cmd('block 1 attribute index 3 800 ')
cubit.cmd('block 1 attribute index 4 2000 ')
cubit.cmd('block 1 attribute index 5 9999.0 ')
cubit.cmd('block 1 attribute index 6 9999.0 ')
cubit.cmd('block 1 attribute index 7 0 ')
cubit.cmd('block 2 hex in volume 3')
cubit.cmd('block 2 name "elastic 2" ')
cubit.cmd('block 2 attribute count 7')
cubit.cmd('block 2 attribute index 1 2 ')
cubit.cmd('block 2 attribute index 2 2500 ')
cubit.cmd('block 2 attribute index 3 1500 ')
cubit.cmd('block 2 attribute index 4 2200 ')
cubit.cmd('block 2 attribute index 5 9999.0 ')
cubit.cmd('block 2 attribute index 6 9999.0 ')
cubit.cmd('block 2 attribute index 7 0 ')
# -------------------- Block properties end -------------------- #
# -------------------- Import modules -------------------- #
from geocubitlib import boundary_definition
from geocubitlib import cubit2specfem3d
# -------------------- Export files start -------------------- #
os.system('mkdir ' + path_folder)
cubit.cmd('export mesh "' + path_folder + '/top.e" dimension 3 overwrite')
cubit.cmd('save as "' + path_folder + '/meshing.cub" overwrite')
cubit.cmd('save as "' + path_folder + '/top.cub" overwrite')
cubit2specfem3d.export2SPECFEM3D(path_folder, cpml = True, cpml_size = 20, top_absorbing = True)
# -------------------- Export files end -------------------- #