Data Driven Approaches for Unsteady Flow Control Over Dynamically Stalling Wings
Abstract
This project is aiming at two subjects for investigating the passive flapping motion of wings at low Reynolds numbers and for computational method on dynamic mode decomposition for unsteady flow over flapping wings. For the passive flapping motion, PI proposed a fluid-structure interaction (FSI) model that couples two elastic wing-hinge dynamics and unsteady flapping aerodynamics to explore passive flapping and pitching mechanisms in a fruit-fly model. A fruit fly wing in hover with prescribed flapping and passive pitching was performed to validate the proposed two elastic wing-hinge model. A passive flapping and pitching wing simulation was performed based on the validated model. The computational results of the passive pitching motion are in good agreements over a phase of fifty degree. For unsteady flow over flapping wings, dynamic mode decomposition (DMD) has attracted growing interest in the research community due to recent advancements in generating large experimental and numerical data sets. An in-house code based on the immersed boundary-lattice Boltzmann method (IB-LBM) was used for the flow simulations on dynamically oscillating wings. An in-house MATLAB code of DMD was successfully used to analyze the wake and the unsteady separation of boundary layers at the leading edge. This method can provide snapshots of the flow field and computes the modes that govern the dynamics. Good agreement of results between current computations and published data was observed, suggesting the present FSI solver can accurately compute the flow over flapping wing systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 23, 2024
- Accession Number
- AD1229683
Entities
People
- Fangbao Tian
- John Young
- Sridhar Ravi
- Sunetra Sarkar
Organizations
- University of New South Wales