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Published (Version of record)CC BY-NC V4.0, Open Access
Published (Version of record)CC BY-NC V4.0, Open
Journal article
Hydrodynamic forces of a prescribed oscillating cylinder in steady currents
Physics of fluids, Vol.37(7), pp.1-16
07/2025
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Abstract
Predicting hydrodynamic forces on an obliquely oscillating riser in current poses challenges, especially as existing practices rely on a linear summation of forces induced by the current and riser motion, which overlooks crucial nonlinear interactions. The present study, using three-dimensional numerical simulations at a fixed Reynolds number of 500 and a small oscillation amplitude of 0.4 cylinder diameters, evaluates these nonlinear effects over a range of oscillation wavelengths (λ* from 1.0 to 25.0) and orientation angles (θ from
0° to90°). The results reveal significant nonlinear interactions at intermediate λ*=1.5–10, forming multiple resonant wake states that either amplify or reduce the hydrodynamic forces. For instance, time-averaged force coefficients in inline and transverse directions increase by more than 2.5 times compared to the no-oscillation case, while the root-mean-squared force coefficient in the motion direction can drop to a minimum (0.1–0.3) at λ*=4–10. Physical explanations on the influences of inclination angle on the wake dynamics and hydrodynamic force coefficients are provided. These findings indicate the inadequacy of linear summation method and propose a new framework incorporating data at 0°, 45°, and 90°, offering improved predictive capability for oblique angles.
Details
- Title
- Hydrodynamic forces of a prescribed oscillating cylinder in steady currents
- Creators
- Chengjiao Ren - South China University of TechnologyLiang Cheng - South China University of TechnologyFeifei Tong - The University of AdelaideFei He - University of Oxford
- Publication Details
- Physics of fluids, Vol.37(7), pp.1-16
- Publisher
- AIP Publishing
- Number of pages
- 15
- Grant note
- This work was supported by the Australia Research Council Discovery Grant (Project ID: DP200102804). This research was supported by computational resources provided by the National Computational Merit Allocation Scheme (NCMAS) and the Pawsey Supercomputing Centre with funding from the Australian Government and the Government of Western Australia. Australia Research Council Discovery Project No. DP200102804.
- Identifiers
- 991013296932102368
- Copyright
- © 2025 Author(s).
- Academic Unit
- Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article