Birth and control of three-dimensional Lagrangian separation: Optimal control
Abstract
A combined theoretical, numerical and experimental program is proposed to develop an energy efficient control of three-dimensional flow separation around aerodynamic control surfaces and their wall junctions. The wall-bounded wing, fin, or blade represents a configuration that has impact on a broad range of technologies that are central to the mission of the Air Force. Recent findings point to a transformative and effective flow control strategy guided by an early detection and manipulation of Lagrangian fluid material dynamics near a surface, albeit in idealized two-dimensional configurations. No work has been performed based on three-dimensional Lagrangian signatures that we have also shown to be dominant close to a wall junction and many chords away from it. Based on investigation of the origins of upwelling (the birth) of the wall-bounded three-dimensional Lagrangian structures, we will design and test suitably constrained control models that are solvable, robust and likely optimal. The control strategy will be tested in both high-fidelity numerical simulations and in water channel and wind tunnel experiments. The reduced order models, simulations and experiments will show whether and how the findings can be extended to much higher Reynolds numbers applicable to real-world designs.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 21, 2022
- Source ID
- FA95502110434XX0
Entities
People
- Gustaaf B Jacobs
Organizations
- Air Force Office of Scientific Research
- Salk Institute for Biological Studies
- United States Air Force