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Vibration mode and velocity interference mechanism of tandem cylinders at subcritical Reynolds number
https://orcid.org/0000-0002-3197-7776
https://orcid.org/0000-0003-1928-2506
Abstract Slender circular section structures with tandem arrangement will vibrate intensely in airflow. This research is conducted on the vibration modes of three tandem cylinders with various spans in the subcritical Reynolds numbers. The vibration modes at various reduced velocities are discussed, indicating that the peaks of displacement are the results of vortex induced vibration and wake induced galloping. Starting from span of 1.5D, vortex induced vibration interferes with wake induced galloping but plays major role resulting a large and typical “8”-shaped response, and at span of 2D, vortex induced vibration occurs first and wake induced galloping appears after that, and then the interference between them intensifies with a maximum displacement at span of 3D, and weakens afterwards with two emerging peaks at span of 3.5D. An interference mechanism is proposed through the adoption of vortex induced vibration and wake induced galloping critical velocity. Furthermore, four velocity interference criteria are presented to explain the vibration modes of the tandem cylinders. The calculation values from the interference mechanism correspond to the values from the numerical simulation. This mechanism, different from the conventional flow pattern, provides an original method to explain the vibration modes of tandem cylinders.
Graphical abstract Display Omitted
Highlights The vibration behavior of tandem cylinders in 1.5D~3.5D are investigated by LES computation. The present results by LES with rigid body methods agree well with published data. Four vibration modes are summarized by coupling effects of VIV and WIG. A velocity interference mechanism proposed adopts for explaining vibration of tandem cylinders.
Vibration mode and velocity interference mechanism of tandem cylinders at subcritical Reynolds number
https://orcid.org/0000-0002-3197-7776
https://orcid.org/0000-0003-1928-2506
Abstract Slender circular section structures with tandem arrangement will vibrate intensely in airflow. This research is conducted on the vibration modes of three tandem cylinders with various spans in the subcritical Reynolds numbers. The vibration modes at various reduced velocities are discussed, indicating that the peaks of displacement are the results of vortex induced vibration and wake induced galloping. Starting from span of 1.5D, vortex induced vibration interferes with wake induced galloping but plays major role resulting a large and typical “8”-shaped response, and at span of 2D, vortex induced vibration occurs first and wake induced galloping appears after that, and then the interference between them intensifies with a maximum displacement at span of 3D, and weakens afterwards with two emerging peaks at span of 3.5D. An interference mechanism is proposed through the adoption of vortex induced vibration and wake induced galloping critical velocity. Furthermore, four velocity interference criteria are presented to explain the vibration modes of the tandem cylinders. The calculation values from the interference mechanism correspond to the values from the numerical simulation. This mechanism, different from the conventional flow pattern, provides an original method to explain the vibration modes of tandem cylinders.
Graphical abstract Display Omitted
Highlights The vibration behavior of tandem cylinders in 1.5D~3.5D are investigated by LES computation. The present results by LES with rigid body methods agree well with published data. Four vibration modes are summarized by coupling effects of VIV and WIG. A velocity interference mechanism proposed adopts for explaining vibration of tandem cylinders.
Vibration mode and velocity interference mechanism of tandem cylinders at subcritical Reynolds number
https://orcid.org/0000-0002-3197-7776
https://orcid.org/0000-0003-1928-2506
Abstract Slender circular section structures with tandem arrangement will vibrate intensely in airflow. This research is conducted on the vibration modes of three tandem cylinders with various spans in the subcritical Reynolds numbers. The vibration modes at various reduced velocities are discussed, indicating that the peaks of displacement are the results of vortex induced vibration and wake induced galloping. Starting from span of 1.5D, vortex induced vibration interferes with wake induced galloping but plays major role resulting a large and typical “8”-shaped response, and at span of 2D, vortex induced vibration occurs first and wake induced galloping appears after that, and then the interference between them intensifies with a maximum displacement at span of 3D, and weakens afterwards with two emerging peaks at span of 3.5D. An interference mechanism is proposed through the adoption of vortex induced vibration and wake induced galloping critical velocity. Furthermore, four velocity interference criteria are presented to explain the vibration modes of the tandem cylinders. The calculation values from the interference mechanism correspond to the values from the numerical simulation. This mechanism, different from the conventional flow pattern, provides an original method to explain the vibration modes of tandem cylinders.
Graphical abstract Display Omitted
Highlights The vibration behavior of tandem cylinders in 1.5D~3.5D are investigated by LES computation. The present results by LES with rigid body methods agree well with published data. Four vibration modes are summarized by coupling effects of VIV and WIG. A velocity interference mechanism proposed adopts for explaining vibration of tandem cylinders.
Vibration mode and velocity interference mechanism of tandem cylinders at subcritical Reynolds number
Fan, Xiantao (author) / Guo, Kai (author) / Jia, Zhanbin (author) / Wang, Yang (author) / Tan, Wei (author)
2020-02-20
Article (Journal)
Electronic Resource
English
| British Library Conference Proceedings | 2003