English Polish
Politechnika Morska w Szczecinie

DSpace Home

DSpace/Manakin Repository

Title
Calculating the second-order hydrodynamic force on fixed and floating tandem cylinders

ISSN printed: 1733-8670, ISSN on-line: 2392-0378
Motallebi, Mohammad1; Ghafari, Hamidreza2; Ghassemi, Hassan3; Shokouhian, Mehdi4
URI: https://repository.am.szczecin.pl/handle/123456789/2624
2020-06-29
In this paper, the second-order hydrodynamic force on fixed and floating tandem cylinders has been calculated and different parameters have been taken into consideration. An incident wave is diffracted by the fixed cylinder, and as a result low-frequency waves radiate toward the floating cylinder and cause low-frequency second-order hydrodynamic forces to act on the surface of the floating cylinder. The interactions between the fixed and floating cylinders have been investigated by changing the distance between them, as well as the draft and radius of the floating cylinder. By employing perturbation series analysis over the wetted surface, the second-order wave excitation force has been calculated. The maximum force applied on the floating cylinder becomes non-dimensional when considering it with and without the fixed cylinder. The results showed the effect that the existence of the fixed cylinder had on the increase in the second-order forces is quite evident where, for a significant parameter of the floating cylinder, the force in the heave direction was enhanced by up to 1.55 times.
  1. Abyn, H., Islam, M.R., Maimun, A., Mahmoudi, A. & Kato, J. (2016) Experimental Study of Motions of Two Floating Offshore Structures in Waves. Brodogradnja 67(2), pp. 1–13.,
  2. Ali, M.T. & Khalil, G.M. (2005) On hydrodynamic interaction between several freely floating vertical cylinders in waves. ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. June 12–17, 2005, Halkidiki, Greece. American Society of Mechanical Engineers Digital Collection, pp. 391–398.,
  3. Barltrop, N.D.P. (1998) Floating Structures: A guide for design and analysis. CMPT.,
  4. Chau, F.P. & Eatock Taylor, R. (1992) Second-order wave diffraction by a vertical cylinder. Journal of Fluid Mechanics 240, pp. 571–599.,
  5. Chua, K.H., Eatock Taylor, R. & Choo, Y.S. (2018) Hydrodynamic interaction of side-by-side floating bodies part I: Development of CFD-based numerical analysis framework and modified potential flow model. Ocean Engineering 166, pp. 404–415.,
  6. Fonseca, N., Pessoa, J., Mavrakos, S. & Le Boulluec, M. (2011) Experimental and numerical investigation of the slowly varying wave exciting drift forces on a restrained body in bi-chromatic waves. Ocean Engineering 38 (17– 18), pp. 2000–2014.,
  7. Ghafari, H. & Dardel, M. (2018) Parametric study of catenary mooring system on the dynamic response of the semi-submersible platform. Ocean Engineering 153, pp. 319–332.,
  8. Ghafari, H.R., Ketabdari, M.J., Ghassemi, H. & Homayoun, E. (2019) Numerical study on the hydrodynamic interaction between two floating platforms in Caspian Sea environmental conditions. Ocean Engineering 188, 106273.,
  9. Hu, J. & Zhou, L. (2017) Experimental and numerical study on wave drift forces on a semi-submersible platform in waves. Ships and Offshore Structures 12(1), pp. 56–65.,
  10. Huang, J.B. & Eatock Taylor, R. (1996) Semi-analytical solution for second-order wave diffraction by a truncated circular cylinder in monochromatic waves. Journal of Fluid Mechanics 319, pp. 171–196.,
  11. Jin, Y., Chai, S., Duffy, J., Chin, C. & Bose, N. (2018) URANS predictions on the hydrodynamic interaction of a conceptual FLNG-LNG offloading system in regular waves. Ocean Engineering 153, pp. 363–386.,
  12. Lim, D.-H. & Kim, Y. (2018) Design wave method for the extreme horizontal slow-drift motion of moored floating platforms. Applied Ocean Research 71, pp. 48–58.,
  13. Lupton, R.C. & Langley, R.S. (2017) Scaling of slow-drift motion with platform size and its importance for floating wind turbines. Renewable Energy 101, pp. 1013–1020.,
  14. Pegalajar-Jurado, A. & Bredmose, H. (2019) Reproduction of slow-drift motions of a floating wind turbine using second-order hydrodynamics and Operational Modal Analysis. Marine Structures 66, pp. 178–196.,
  15. Pinkster, J.A. (1980) Low frequency second order wave exciting forces on floating structures. Doctoral thesis. TU Delft.,
  16. Renaud, M., Rezende, F., Waals, O., Chen, X.-B. & van Dijk, R. (2008) Second-order wave loads on a LNG carrier in multi-directional waves. ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. June 15–20, 2008, Estoril, Portugal. American Society of Mechanical Engineers Digital Collection, pp. 363–370.,
  17. Teng, B. & Kato, S. (1999) A method for second-order diffraction potential from an axisymmetric body. Ocean Engineering 26(12), pp. 1359–1387.,
  18. Vazquez, J.H. (1995) Hydrodynamic loads on offshore structures in bichromatic bidirectional seas. Doctoral thesis. University of Houston.,
  19. Zhang, L.R., Lu, H., Yang, J., Peng, T. & Xiao, L. (2013) Low-frequency drift forces and horizontal motions of a moored FPSO in bi-directional swell and wind-sea offshore West Africa. Ships and Offshore Structures 8(5), pp. 425–440.,

Title

Calculating the second-order hydrodynamic force on fixed and floating tandem cylinders

Pages

108-115

Figures

6

Tables

2

ISSN printed

1733-8670

ISSN on-line

2392-0378

DOI

10.17402/425

Type

Journal

62 Scientific Journals of the Maritime University of Szczecin, no. 62 / 2020

Publisher

Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie

Copyright Holder

Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie

Published

2020-06-29

Recieved

2019-12-09

Accepted

2020-04-08

Funding

No data

Keywords

fixed cylinder, floating cylinder, second order hydrodynamic force, diffracted wave, potential theory

URI:

https://repository.am.szczecin.pl/handle/123456789/2624

Language

English

Authors

Motallebi, Mohammad1; Ghafari, Hamidreza2; Ghassemi, Hassan3; Shokouhian, Mehdi4

Affiliation

1 Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran, m_motallebi@aut.ac.ir
2 Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran, hamidghafari230@yahoo.com
3 Department of Maritime Engineering, Amirkabir University of Technology, Tehran, Iran, gasemi@aut.ac.ir
4 Morgan State University, Department of Civil Engineering, Baltimore, USA,

Show full item record

Files in this item

Download paper in PDF format
Name: 12-zn-am-62-134-m...
Size: 1.20 MB
Format: PDF
Licence: CC BY
Download

This item appears in the following Collection(s)

Search repository

Advanced Search

Browse

My Account

RSS Feeds

XML

Cite