This paper explores the fluid-elastic response of a cantilevered flexible sheet in the presence of uniform airflow. The leading edge of the sheet is clamped, while at the trailing edge, tension is applied to provide additional rigidity to the sheets small but finite bending stiffness. We outline a series of experiments performed in a wind tunnel with the purpose of examining fluid-elastic instabilities. In particular, we examine the role of tension induced rigidity and how it influences static divergence and convected wave instabilities. The flow is characterised by Reynolds numbers of order 105–106 and we specifically examine a sheet with an aspect ratio of L/l = 1.33. A unique aspect of this present work, is the direct measurement of sheet displacements through an optical tracking method with a grid of passive markers placed on the sheet surface. We show the evolution of the sheet surface from stability, through to divergence, and then finally into flutter. The frequency composition of the flutter event shows higher harmonic components that suggest significant nonlinearities. Tension induced rigidity plays a crucial role in the response of the sheet to the fluid in both postponing and suppressing instabilities.
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ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering
June 15–20, 2008
Estoril, Portugal
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4821-0
PROCEEDINGS PAPER
The Response of a Flexible Sheet Under Axial Tension Immersed in Parallel Flow
Michael T. Morris-Thomas,
Michael T. Morris-Thomas
Norwegian University of Science and Technology, Trondheim, Norway
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Sverre Steen
Sverre Steen
Norwegian University of Science and Technology, Trondheim, Norway
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Michael T. Morris-Thomas
Norwegian University of Science and Technology, Trondheim, Norway
Sverre Steen
Norwegian University of Science and Technology, Trondheim, Norway
Paper No:
OMAE2008-57993, pp. 737-744; 8 pages
Published Online:
July 27, 2009
Citation
Morris-Thomas, MT, & Steen, S. "The Response of a Flexible Sheet Under Axial Tension Immersed in Parallel Flow." Proceedings of the ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. Volume 4: Ocean Engineering; Offshore Renewable Energy. Estoril, Portugal. June 15–20, 2008. pp. 737-744. ASME. https://doi.org/10.1115/OMAE2008-57993
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