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Surface Layer Diagnostics from Quantitative Flow Visualization

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Aerodynamics plays a paramount role in air, maritime and ground transport, as well as for renewable energy. “Lighter, larger and smarter” designs are prone to unsteady and aeroelastic behaviour, requiring fundamental understanding of the flow phenomena.
Citing JD Anderson “The only mechanisms Nature has for communicating a force to a body moving through a fluid are pressure and shear stress on the body surface”. Thus, accessing the surface flow properties unveils how the airflow exerts the forces causing motions and deformations of the object immersed in it.
Quantifying the global distribution of pressure and shear stress is the objective of AEROSQIN, with the goal of transforming flow visualization into a holistic instrument that captures aerodynamic loads and forces alongside describing the flow patterns for phenomenological analysis.

To date, flow measurements techniques capture the outer region but the scales and processes in the surface layer remain elusive, especially for moving or flexible objects or in-flight, where methods for surface and load analysis become unsuited.

In recent years, I pushed the boundaries of quantitative flow visualisation introducing neutrally buoyant tracers for aerodynamics, advanced 3D velocimetry and data assimilation for PIV, opening opportunities for:
I) Design of non-conventional scalable tracers with opto-mechanical properties to match experimental scaling.
II) Omnidirectional optical framework for simultaneous, global surface detection and flow analysis.
III) Data assimilation and modelling theories to extract unresolved surface flow stresses from raw data.

Experiments on unsteady, three-dimensional flows will focus on the two major players: surface pressure and flow shear. Up to the metre for flow-visualization and below the millimetre at the skin, the results pave the way to holistic visualizations in aerodynamic experiments of flutter, airfoil buffeting, and extrapolation to in-flight studies.

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TECHNISCHE UNIVERSITEIT DELFT
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€ 2 246 250,00
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