vamseeachanta Cad Mesh Generation
When to Use This Skill
Use this skill when you need to:
- Create parametric CAD models of vessels, platforms, or structures
- Generate meshes for finite element analysis (FEA)
- Generate panel meshes for boundary element methods (BEM/hydrodynamics)
- Automate geometry creation for marine structures
- Export geometry to AQWA, WAMIT, ANSYS, or other analysis tools
- Create complex geometries programmatically with Python
- Perform mesh quality checks and refinement
Core Knowledge Areas
1. FreeCAD Python Scripting Basics
Creating geometry with FreeCAD Python API:
import sys
from pathlib import Path
from typing import List, Tuple, Optional
import numpy as np
# Try to import FreeCAD, provide fallback for development
try:
*See sub-skills for full details.*
### 2. GMSH Mesh Generation
Creating meshes with GMSH Python API:
```python
# Try to import gmsh
try:
import gmsh
GMSH_AVAILABLE = True
except ImportError:
GMSH_AVAILABLE = False
print("Warning: GMSH not available, using mock")
*See sub-skills for full details.*
### 3. Mesh Quality Assessment
Check mesh quality metrics:
```python
def analyze_mesh_quality(
mesh_file: Path,
mesh_type: str = 'surface'
) -> dict:
"""
Analyze mesh quality metrics.
*See sub-skills for full details.*
### 4. Mesh Conversion for Analysis Tools
Convert meshes to various formats:
```python
def convert_mesh_to_wamit_gdf(
mesh_file: Path,
output_file: Path,
symmetry: str = 'none'
) -> None:
"""
Convert GMSH mesh to WAMIT .gdf format.
*See sub-skills for full details.*
## Complete Examples
### Example 1: Complete Vessel Geometry and Mesh Workflow
```python
from pathlib import Path
import numpy as np
def complete_vessel_geometry_workflow(
vessel_params: dict,
mesh_params: dict,
output_dir: Path
) -> dict:
"""
*See sub-skills for full details.*
## Resources
### FreeCAD
- **Documentation**: https://wiki.freecadweb.org/
- **Python API**: https://wiki.freecadweb.org/Python_scripting_tutorial
- **Examples**: https://github.com/FreeCAD/FreeCAD/tree/master/src/Mod/Part/TestPartApp
### GMSH
- **Documentation**: https://gmsh.info/doc/texinfo/gmsh.html
- **Python API**: http://gmsh.info/doc/texinfo/gmsh.html#Gmsh-API
- **Tutorials**: https://gitlab.onelab.info/gmsh/gmsh/-/tree/master/tutorials
### Mesh Generation
- **Netgen**: https://ngsolve.org/
- **TetGen**: http://wias-berlin.de/software/tetgen/
- **Triangle**: https://www.cs.cmu.edu/~quake/triangle.html
### Marine Geometry
- **DelftShip**: Free ship hull design software
- **MAXSURF**: Professional naval architecture software
- **Rhinoceros**: Advanced 3D modeling (with Grasshopper for parametric)
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**Use this skill for:** Expert CAD geometry creation and mesh generation for marine structures with full export capabilities to analysis software.
## Sub-Skills
- [1. Parametric Design (+2)](1-parametric-design/SKILL.md)