Journal
JOURNAL OF FLUIDS AND STRUCTURES
Volume 94, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jfluidstructs.2020.102908
Keywords
Submerged floating tunnel; Vortex-induced vibration; Response amplitude; Lift force; Torsional moment
Categories
Funding
- Norwegian Public Roads Administration
- Research Council of Norway
- Centre for Ships and Ocean Structures (CeSOS), at the Department of Marine Technology, NTNU, Trondheim, Norway
- Centre for Autonomous Marine Operations and Systems (AMOS), at the Department of Marine Technology, NTNU, Trondheim, Norway
- national Science Fund for Distinguished Young Scholars of China [51825903]
- Shanghai Science and Technology Program [19XD1402000]
- 13th Five-Year National Science and Technology Major Project of China [2016ZX05028-001]
- Ub-project of the Important National Science & Technology Specific Projects of China [2016ZX05028-002-004]
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The cross-flow vortex-induced vibration features of a submerged floating tunnel element, which is composed of two rigidly connected cylinders in a tandem configuration, were investigated via a self-oscillation model test in a steady flow. The Reynolds number ranged from 2x10(4) to 9x10(4), and the ratio of the center-to-center distance between the two cylinders and cylinder diameter varied within a range of 2-4. The vortex induced vibration responses and lift forces on the up- and downstream cylinders were studied under different spacing ratios and compared with those on a single cylinder. The results show that the spacing ratio plays an important role in VIV until the ratio reaches 4. For a small spacing ratio, a significant difference between the lift forces on the up- and downstream cylinders appears and induces a large torsional moment. For the convenience of engineering application, a torsional coefficient was proposed. The maximum torsional coefficient can reach 2.9, 1.2 and 0.98 for spacing ratios of 2, 3 and 4 at the reduced velocity of 5, respectively. Considering the vortex induced vibration responses as well as the torsional moment, a spacing ratio of 3 was recommended for tandem floating tunnel design. (C) 2020 Elsevier Ltd. All rights reserved.
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