From CFD Simulation to 3D-Printed Reality: Designing a Wind Turbine in OpenFOAM
Excited to share the completion of my wind turbine aerodynamic design project - a journey from
theoretical calculations to high-fidelity CFD simulation to a functional physical prototype!
The Challenge: Design a 5-meter radius horizontal-axis wind turbine (HAWT), validate performance
through computational fluid dynamics, and bring it to life as a physical model.
The Digital Journey:
Applied Blade Element Momentum (BEM) theory to design optimal blade geometry - chord and twist
distributions along the 5m span
Created detailed 3D CAD models in CATIA V5 with NACA airfoil profiles
Set up and ran transient CFD simulations in OpenFOAM (k-ω SST turbulence model, ~3M cells)
Captured complex flow phenomena: helical tip vortices, wake development, and pressure distributions
on rotating blades
Achieved stable performance: Cp = 0.23, 11.12 kW power output at 10 m/s wind speed
The Transition - Digital to Physical: Here's where it got interesting: converting surface geometry
optimized for CFD meshing into solid models suitable for 3D printing required completely rethinking the
design approach.
I had to: → Rebuild the blade geometry as solid bodies (not just surfaces) → Design a functional hub
assembly with proper blade mounting → Create a spinner fairing with smooth hub-to-blade transitions
→ Engineer internal structures to support the aerodynamic loads
The Physical Result: Successfully 3D-printed and assembled a complete, scale wind turbine that:
Rotates freely under wind loadingDemonstrates proper aerodynamic behavior (pressure
differential drives rotation)Features 3d Printed Bearing allowing independent rotor/nacelle
rotation Validates the CFD predictions through real-world testing
Key Learnings: The performance gap between theoretical predictions (Cp = 0.4) and CFD results (Cp =
0.23) taught me invaluable lessons about mesh resolution, 3D flow effects, and the importance of
validation. Real engineering isn't about perfect results - it's about understanding why reality differs
from theory and knowing how to improve.
Bridging the gap between computational simulation and physical prototyping reinforced that modern
engineering requires both digital and hands-on skills. OpenFOAM gave me the virtual wind tunnel; 3D
printing gave me the tangible proof.
Tools: OpenFOAM, CATIA V5, ParaView, 3D Printing
