Pre/Post-Processing

Calculix uses the Abaqus .inp format for input files. The results are stored in .frd files which can be converted to .vtk format.

To convert .frd files to .vtk files:

cd FENGSim/starter/ccx/Mesh1
python3 ./../../../toolkit/MultiX/extern/Calculix/ccx2paraview/ccx2paraview.py modal.frd vtu
python3 ./../../../toolkit/MultiX/extern/Calculix/ccx2paraview/ccx2paraview.py modal.frd vtk

For more details about the ccx2paraview converter, please refer to its README.md file.

Formats

From .xml and .msh to .inp

The xml2inp.py script converts configure.xml and a mesh file (all.msh from CGX or all2.msh from Gmsh) into a single modal2.inp file. xml2inp.py removes line and face elements from the .msh file.

To convert .xml and .msh to .inp:

cd FENGSim/starter/ccx/Mesh1
python3 xml2inp.py
input .xml file: configure
.xml file is configure.xml
input .msh file: all2
.msh file is all2.msh
./../../../toolkit/MultiX/extern/Calculix/bin/ccx_2.21 modal2
python3 ./../../../toolkit/MultiX/extern/Calculix/ccx2paraview/ccx2paraview.py modal2.frd vtk
alternate text

From .xml and .msh to .inp (with boundary conditions)

Gmsh automatically assigns unique IDs to all geometric sets. Gmsh also defines physical groups for boundary conditions and materials, as shown in the figure below.

To create the model with physical groups by scripts:

cd FENGSim/starter/ccx/beam
gmsh beam
alternate text

Since boundary conditions are defined on node sets, the option “Save groups of nodes” is choosed to export .inp files, as shown in the figure below.

alternate text

To convert .xml and .msh to .inp:

cd FENGSim/starter/ccx/beam
python3 xml2inp.py
input .xml file: configure
.xml file is  configure.xml
input .msh file: all
.msh file is  all.msh
./../../../toolkit/MultiX/extern/Calculix/bin/ccx_2.21 modal
python3 ./../../../toolkit/MultiX/extern/Calculix/ccx2paraview/ccx2paraview.py modal.frd vtk
alternate text

From .xml and .dat to .inp

The dat2inp.py script converts configure.xml and oiltank.dat into a single modal.inp file.

To convert .xml and .dat to .inp:

cd FENGSim/starter/ccx/oiltank
python3 dat2inp.py
input .xml file: configure
.xml file is configure.xml
input .dat file: oiltank
.msh file is oiltank.dat
./../../../toolkit/MultiX/extern/Calculix/bin/ccx_2.21 modal
python3 ./../../../toolkit/MultiX/extern/Calculix/ccx2paraview/ccx2paraview.py modal.frd vtk
alternate text

The .dat file format is defined as follows:

  • Line 1: The number 31276 represents the total number of vertices, and 99818 represents the total number of cells.

  • Line 8: sphere_tank is the name of a cell group, and 56644 is the number of cells in this group.

  • Line 12: outer_surface_nodes is the name of a vertex group, and 9247 is the number of vertices in this group.

  • Other lines follow a similar pattern.

3 4 31276 99818
1 -8315 2.55536e-12 0
......
31276 8315 0 10850
1 59 2 1 98
......
99818 31180 31223 31222 31179
8 sphere_tank 56644
2601
.....
97218
7 outer_surface_nodes 9247
788
.....
30489
7 inner_surface_nodes 8317
862
.....
30415
7 fixed_nodes 200
1
.....
31222
8 guandao 2866
47324
.....
52495
8 support 40308
1
.....
99818
7 guandao_fixed_nodes 24
14829
.....
16488