Synchronous high-speed measurements of a flexible structure under wind gust load
Publication date
2024-07-16
Document type
Forschungsartikel
Author
Neumann, Torben
Organisational unit
ISSN
Series or journal
Physics of Fluids
Periodical volume
36
Periodical issue
7
Peer-reviewed
✅
Part of the university bibliography
✅
DDC Class
000 Informatik, Information & Wissen, allgemeine Werke
500 Naturwissenschaften
600 Technik
Keyword
Wind gust
Particle-image velocimetry
Digital-image correlation
Fluid-structure interaction
Measurement
Abstract
Simultaneously measuring the fluid flow around a flexible structure and the resulting deformations during short-term yet highly dynamic flow events is the focus of this fluid-structure interaction (FSI) study. These scenarios occur when a wind gust impacts a flexible structure, leading to extreme loads and significant deflections. To mimic such gusts, a specifically designed wind gust generator is used within a wind tunnel featuring an open test section. A high-speed particle-image velocimetry system records the flow field, while the digital-image correlation technique captures the structural deformations. That allows to perform synchronized coupled fluid-structure measurements for a \mbox{T-structure} under wind gust load. The time-resolved measurements are repeated up to 104 times, allowing for phase-averaging of both the flow and the structural data, and to examine the convergence of the statistics. A comprehensive analysis of the instantaneous and phase-averaged data reveals that the flow field in the vicinity of the structure undergoes noticeable changes during the gust impact. The recirculation region behind the T-structures perceptibly increases when the gust hits the structure. A maximum deformation of about 10% of its height is observed during the highly dynamic gust event. Given (1) the availability of synchronously recorded data for both the fluid flow and the structure deformation, (2) the simplicity of the structure's geometry, and (3) the moderate Reynolds number of about 4 x 10^4, this case also serves as a well-suited benchmark test case for evaluating simulation methodologies for strongly coupled, highly dynamic FSI problems.
Cite as
Phys. Fluids 36, 075147 (2024); doi: 10.1063/5.0215724
Version
Published version
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Metadata only access