Vertical-Axis Turbine Wake CFD Simulation

ISEF Category: Energy: Sustainable Materials and Design

Subcategory: Wind and Water Movement Power Generation  ·  Difficulty: Advanced  ·  Setup: University Lab  ·  Time: Full Year

The Hook

A wind turbine can steal wind from the one behind it. That shadow is called a wake, and it can make nearby turbines spin less efficiently. Fish schools face a similar problem, they move through water in ways that affect the group. You can test whether a fish-inspired layout helps wind turbines work together better.

What Is It?

This project studies how vertical-axis wind turbines behave when you place them in an array, or group, instead of alone. A vertical-axis wind turbine spins around a vertical shaft, like a whisk turning upright. Because each turbine changes the airflow behind it, the next turbine sees a messy, slower stream of wind.

That messy stream is called a wake. Think of it like the swirl behind a moving boat. If you can predict how wakes overlap, you can test whether a fish-school-like pattern helps the whole array capture more energy than a simple line or grid. OpenFOAM lets you simulate those airflow patterns in 3D, and smoke visualization gives you a real-world check on the flow shape.

Why This Is a Good Topic

This is a strong science fair topic because you can change one design choice, like spacing or arrangement, and measure a clear output, like wake speed, turbulence, or power proxy. The question connects to real wind farm design, where small layout changes can affect energy output and cost. You also get to practice CFD, validation, and data analysis, which are real research skills you can build from scratch.

Research Questions

• How does turbine spacing affect wake recovery in a school-fish-inspired vertical-axis wind turbine array?
• What is the effect of array geometry on downstream flow speed and turbulence behind the turbines?
• Does a fish-inspired staggered layout reduce wake losses more than a straight-line layout?
• To what extent does changing turbine rotation direction alter wake interaction in paired vertical-axis turbines?
• Which array configuration produces the most uniform flow field behind the turbine group?
• How does turbine spacing change the difference between simulated flow patterns and smoke visualization results?

Basic Materials

• Computer with enough memory and storage to run OpenFOAM simulations.
• OpenFOAM installed on Linux or a Linux virtual machine.
• Basic 3D flow visualization setup or smoke source for demonstration, if available through a lab.
• Clear enclosure or test area for safe smoke visualization.
• Small vertical-axis turbine model or 3D-printed turbine prototype.
• Measuring tape or calipers for model spacing.
• Phone or camera for recording smoke flow.
• Spreadsheet software for organizing simulation outputs.
• Notebook for tracking design settings and results.

Advanced Materials

• University workstation or cluster access for CFD runs.
• OpenFOAM with meshing and post-processing tools.
• 3D printer or CNC access for custom turbine models.
• Wind tunnel or flow bench for validation runs.
• Smoke generator, fog machine, or tracer source approved by the lab.
• Hot-wire anemometer or pitot probe for velocity checks.
• Particle image velocimetry system, if available.
• Force balance or torque sensor for turbine performance data.
• Calibration tools for alignment and spacing checks.

Software & Tools

• OpenFOAM: Runs the CFD model and predicts how wind moves through each turbine layout.
• ParaView: Visualizes velocity, pressure, and wake structure from simulation output.
• ImageJ: Measures smoke plume shape and compares visual flow patterns across trials.
• Python: Organizes simulation results and calculates summary statistics or plots.
• Excel: Stores trial settings, organizes results, and makes quick comparison charts.

Experiment Steps

1. Define the layout variable you will test first, such as spacing, stagger, or rotation direction.
2. Build a simple baseline model that represents one turbine alone, then add nearby turbines one change at a time.
3. Plan a validation step that compares simulation flow patterns with smoke visualization so you can check whether the model behaves realistically.
4. Decide which output will serve as your main metric, such as wake length, velocity deficit, or flow uniformity behind the array.
5. Set controls for turbine size, wind speed, and boundary conditions so the comparison stays fair.
6. Choose a data analysis method that compares layouts with clear statistics, not just pictures.

Common Pitfalls

• Using a mesh that is too coarse near the blades, which hides wake structure and makes the simulation look smoother than reality.
• Comparing layouts with different boundary conditions, which makes the results unfair and hard to interpret.
• Treating smoke visuals as proof without matching them to a measurable CFD output, which weakens validation.
• Ignoring spin direction in paired turbine tests, which can change the wake pattern more than spacing does.
• Running too many layout changes at once, which makes it impossible to tell which design choice caused the result.

What Makes This Competitive

A strong version of this project goes beyond pretty flow pictures. You can compare multiple array geometries, test more than one spacing rule, and use statistics to show whether one layout truly performs better. Validation matters a lot, so matching CFD output to smoke images or other flow measurements makes your claim much stronger. The best projects also explain why the winning layout works, not just which one wins.

Project Variations

• Test whether counter-rotating turbine pairs reduce wake loss more than co-rotating pairs.
• Compare a fish-school-inspired staggered array with a straight-line array and a compact grid.
• Analyze how wake interaction changes when you switch from one turbine model shape to another vertical-axis rotor design.

Learn More

• OpenFOAM User Guide: Search the official OpenFOAM documentation for meshing, turbulence models, and post-processing tutorials.
• MIT OpenCourseWare Fluid Mechanics: Find free lecture materials for flow, wakes, and boundary layers on MIT OpenCourseWare.
• NOAA National Weather Service JetStream: Use the free learning site for basic wind and atmospheric flow concepts.
• NASA Glenn Research Center Beginner's Guide to Aerodynamics: Search NASA Glenn for free explanations of drag, lift, and airflow behavior.
• Wind Energy Explained: Check your school or local library for this textbook if you want a deeper wind energy background.