Seastead Simulation Software Comparison

Executive Summary

For your specific seastead design with angled cylindrical legs, pivot points, and cables in waves, DualSPHysics offers the best combination of accuracy, GPU acceleration for your hardware, and visualization capabilities. Project Chrono with Chrono::FSI-SPH is also excellent if you're already familiar with it, as it avoids BEM limitations. Blender with Ocean + Rigid Body Physics could work for visualization but lacks engineering accuracy for cable tension analysis.

Key Consideration: Your design requires accurate simulation of partially submerged bodies, cable slack/snap loads, and non-linear wave interactions. SPH (Smoothed Particle Hydrodynamics) methods are particularly well-suited for this as they handle complex free-surface flows and large motions without meshing difficulties.

Detailed Comparison Table

Software	Method	Accuracy for Seastead	Time to First Simulation (with Claude Code)	GPU Utilization	Cable/Snap Load Analysis	Visualization Quality	Model Reusability
DualSPHysics	SPH (Meshless)	High Excellent for complex free-surface flows, partially submerged bodies, and violent motions	3-7 days Steep learning curve but well-documented. Claude Code can help with SPH setup and Lua scripting for controls.	Excellent Native CUDA support, perfect for your A6000	Medium Can export forces; needs custom post-processing for cable tension analysis	High Direct ParaView integration for stunning visualizations	Medium XML-based input files; parameterization requires scripting
Project Chrono + Chrono::FSI-SPH	SPH + Multibody Dynamics	High Excellent for cable dynamics and rigid body interactions with SPH fluid	2-5 days You already have experience. Claude Code can help with the FSI-SPH module setup.	High Supports GPU acceleration for SPH	High Excellent cable/connector modeling with snap load detection	Medium OpenGL-based; can export to ParaView	High C++ API and Python bindings allow easy model changes
OpenFOAM + waves2Foam	CFD (Volume of Fluid)	High Most accurate for fluid dynamics but computationally expensive	2-4 weeks Steep learning curve. Claude Code can help with case setup but requires CFD knowledge.	Medium Some GPU-accelerated solvers available	Medium Can compute forces; needs custom routines for cable analysis	High Excellent with ParaView	Medium Script-based with Python/FoamDict
Capytaine + MoorDyn	BEM + Lumped Mass	Low BEM assumes linear waves and small motions - inadequate for your partially submerged angled legs	1-3 days Python-based, easy to start. Claude Code can help with integration.	Low CPU-based, no GPU acceleration	Medium MoorDyn handles cables well but coupled with BEM limitations	Medium Matplotlib/Plotly for visualization	High Python scripts, easy to modify
Blender + Ocean + Rigid Body	Visual Effects Physics	Low Not engineered for accuracy - visual approximation only	2-4 days Easy visual setup. Claude Code can help with Python scripting in Blender.	Medium Uses GPU for rendering, not physics	Low No accurate cable tension simulation	High Beautiful rendering, best for presentations	High Easy to modify objects and animations
WEC-Sim + MoorDyn	BEM + Multibody	Medium Good for WECs but still BEM-based with limitations for your geometry	1-2 weeks Requires MATLAB/Simulink license. Claude Code can help with MATLAB scripting.	Low CPU-based	High Excellent cable modeling with MoorDyn	Medium MATLAB plotting and Simulink visualization	High MATLAB scripts easy to modify

YouTube Simulation Examples

DualSPHysics: Floating Wind Turbine Simulation - Shows SPH accuracy for floating structures
Project Chrono: Your Own Design - Already demonstrates Chrono's capabilities
OpenFOAM: Wave-Structure Interaction - Shows CFD accuracy
Blender: Ocean Simulation Tutorial - Demonstrates visual quality (not engineering accuracy)
Capytaine: Wave Energy Converter BEM - Shows BEM limitations for large motions

Recommendations Based on Your Hardware

Your NVIDIA A6000 GPU with 64 cores and 750GB RAM is ideal for:

DualSPHysics - Native CUDA acceleration, perfect for your hardware
Project Chrono with GPU-accelerated SPH - Excellent utilization of your GPU
OpenFOAM with GPU solvers - Can leverage your GPU for some solvers

For Cable Slack/Snap Load Analysis:

Both DualSPHysics and Project Chrono can export time-series forces on bodies. You would need to:

Run simulation with your seastead model
Export force/moment data at cable attachment points
Post-process in Python (Claude Code can help) to calculate cable tensions
Identify when tensions approach zero (slack) or exceed thresholds (snap load)

Model Reusability for Different Designs

Once you have a working simulation template:

DualSPHysics: Modify XML case files (dimensions, positions, properties). Claude Code can help parameterize these.
Project Chrono: Modify C++/Python scripts. Very flexible for changing configurations.
OpenFOAM: Modify dictionaries and scripts. More complex but powerful.
Blender: Easiest - just move/resize objects in the GUI or via Python scripts.

Estimated time to adapt to new design: 1-3 days for SPH/CFD methods once you have the initial template.

Step-by-Step Implementation Roadmap

Week 1: Start with Project Chrono + Chrono::FSI-SPH since you have experience. Claude Code can help set up the SPH fluid and cable connections.
Week 2: If Chrono doesn't meet accuracy needs, try DualSPHysics. Start with a simple cylinder in waves, then add cables and pivots.
Week 3: Develop Python post-processing scripts (with Claude Code) to analyze cable tensions and identify slack/snap conditions.
Week 4: Create visualization templates in ParaView for consistent comparison across wave heights.