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Related Experiment Video

Updated: May 17, 2026

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods

Experimental Investigation of the Flow Structure over a Delta Wing Via Flow Visualization Methods

Published on: April 23, 2018

Fluid-structure interaction simulation of an avian flight model.

Sebastian Ruck¹, Herbert Oertel

¹Institute for Fluid Mechanics, Karlsruhe Institute of Technology, Germany. sebastian.ruck@kit.edu

The Journal of Experimental Biology

|November 30, 2010

Summary

This study models avian flight aerodynamics using fluid-structure interaction. It reveals how flapping wing vortex dynamics change with reduced frequency, transitioning from discrete to continuous vortex gaits.

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Area of Science:

Aerospace Engineering
Biomechanics
Computational Fluid Dynamics

Background:

Understanding avian flight aerodynamics is crucial for bio-inspired engineering.
Previous models often simplify wing kinematics and fluid-structure interactions.

Purpose of the Study:

To investigate unsteady aerodynamic performance of flapping wings.
To analyze vortex dynamics across various reduced frequencies and Reynolds numbers.

Main Methods:

Developed a 3D numerical avian model with elastic membrane wings.
Employed fluid-structure interaction (FSI) and Reynolds-averaged Navier-Stokes (RANS) simulations.
Approximated flight kinematics using sinusoidal wing rotation.

Main Results:

Characterized macroscopic flow configurations including starting, stopping, trailing, and bound vortices.
Observed a transition from discrete vortex rings to a chain of elliptical vortex rings at higher reduced frequencies (k > 0.67).
Identified a shift to a continuous vortex gait at lower reduced frequencies, with increased upstroke activity and spanwise vortex shedding.

Conclusions:

The study provides insights into the complex vortex shedding mechanisms in avian flight.
Results indicate a frequency-dependent transition in wake structure.
The model accurately captures key aerodynamic features of flapping wing flight.