dismech-python

Straight contortion of 3D discrete rod.	Hex parachute falling with drag.
Energy-conserving Newmark-beta ($\gamma=0.5$ $\beta=0.25$) integration.	Energy-conserving implicit midpoint integration.

A discrete differential geometry deformable structure simulator based on Dismech.

Setup

To install this Python library within a new virtual environment execute the following bash commands. If you wish to use your own package manager (conda), only execute the commands after the comment.

python -m venv .venv
source .venv/bin/activate           #.venv/Script/activate for Windows

# after virtual environment setup
pip install -r requirements.txt
pip install -e .                    # Editable installation for development

UV Setup

This Python library has been updated to work with uv.

uv pip install -e . # automatically creates .venv

Features

• 3D discrete elastic rod stretching, bending and twisting.
• 3D discrete elastic shell hinge and mid-edge bending.
• Pytest numerical validation suite (compared against Dismech Matlab).
• Dismech Matlab compatabile input format.
• Implicit integration schemes (Euler and Newmark-beta).
• Dense and sparse (PyPardiso) solvers.
• Significant speedup for dynamic simulations.

Experiments

To run example experiments, please run the python notebooks located in experiments. They rely on local paths to tests/resources, so they will break if moved.

TODO

• IMC rod contact and friction modeling.
• Shell contact and friction modeling.
• Sphinx documentation.
• Slinky NN demonstration.