Mesh with Python

Overview

SALOME can save all GUI operations as a Python script. This allows you to:

• Modify geometry and mesh parameters without rebuilding from scratch
• Automate mesh generation
• Version-control your meshing workflow

Setup

mkdir -p TRUST_TUTORIALS/salome/exo5
cd TRUST_TUTORIALS/salome/exo5

Copying the Python Script

Copy the Python script from the previous exercise:

cp ../exo4/Mesh_1.py .
cp $TRUST_ROOT/docs/exercices/salome/Coupled_pb.data .

Note: If you have not completed the previous exercise:

path=$TRUST_ROOT/docs/exercices/salome
cp $path/Coupled_pb.py Mesh_1.py

Editing the Python Script

Open Mesh_1.py in a text editor and make the following changes:

• Add a mesh export command at the end of the script:

  Mesh_1.ExportMED("Mesh_1.med", 0)

• Modify the geometry parameters:
  • Change box and cylinder height: 400 → 300
  • Change cylinder radius: 40 → 70
• Modify the mesh parameters in NETGEN_3D_Parameters_1:
  • MaxSize: 48.9898 → 9.
  • MinSize: 6.97246 → 2.
• Save and close the file

Generating the New Mesh

Run the Python script in SALOME's terminal mode:

$PathToSALOME/salome -t Mesh_1.py

The file Mesh_1.med will be generated in your folder. You will notice:

• The box is smaller in the z-direction
• The cylinder is thicker
• The mesh is finer

Running the Calculation

Run TRUST with the new mesh:

trust Coupled_pb

Advantages of the Python Workflow

• Reproducibility: Scripts document your exact meshing process
• Parametric studies: Parameters can be easily modified for sensitivity analyses
• Automation: Can be integrated into larger workflows
• Version control: Scripts can be tracked with Git or other VCS tools
• Batch processing: Multiple meshes with different parameters can be generated automatically