Airfoil Design for a Straight-Bladed VAWT (Re = 400,000)

Course: Aerodynamics (ME 4019)
Team: Tahmid Jawad · Sajid Sadman · Eusha Aswad · Mahmudul Hasan Nur · Naimul Hider Rimu

📄 Report: report/airfoil-design-vawt-Re400k.pdf
🗂️ XFLR5 project: xflr5/airfoil-design.xfl

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TL;DR

• Goal: Design an airfoil for a straight-bladed Darrieus VAWT operating near Re ≈ 4×10⁵, targeting high L/D, smooth stall, and practical geometry.
• Tools: XFLR5/XFOIL for viscous 2D analysis; literature checks for validation.
• Approach: Start from a baseline NACA profile, validate the toolchain, then iterate LE radius, TE thickness, and camber/thickness to maximize L/D over the operating AoA band.
• Deliverables: Final report + XFLR5 project so anyone can quickly reproduce polars.

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Quick reproduce (XFLR5)

1. Open xflr5/airfoil-design.xfl in XFLR5.
2. Polars → Define: set Viscous, Re = 400000, AoA range (e.g., −8° → 20°), and Ncrit (e.g., 9).
3. Run analyses for the candidate profile(s).
4. (Optional) Polars → Compare to examine Cl(α), Cd(α), Cm(α) and L/D trends.
5. (Optional) Export plots/CSV polars (if you later decide to publish them).

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Repository layout

airfoil-design-vawt-re400k/
├─ report/
│  └─ airfoil-design-vawt-Re400k.pdf
├─ xflr5/
│  └─ airfoil-design.xfl
└─ README.md

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License

This repository (report + XFLR5 project) is released under CC BY-NC 4.0.
See the LICENSE file for details.

• You may share and adapt with attribution.
• Non-commercial use only.

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How to cite

A citation file is provided (see CITATION.cff).

@misc{airfoil_vawt_re400k_2025,
  title        = {Airfoil Design for a Straight-Bladed VAWT (Re = 400,000)},
  author       = {Tahmid Jawad and Sajid Sadman and Eusha Aswad and Mahmudul Hasan Nur and Naimul Hider Rimu},
  year         = {2025},
  howpublished = {\url{https://github.com/sajid1721/airfoil-design-vawt-re400k}},
  note         = {Report and XFLR5 project}
}

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Contact

Sajid Sadman — GitHub: @sajid1721