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3D numerical modeling of wave forces on tandem fixed cylinders using the BEM

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Abstract

In this paper a 3D numerical model was developed to study the complicated interaction between waves and a set of tandem fixed cylinders. The fluid was considered to be inviscid and irrotational. Therefore, the Helmholtz equation was used as a governing equation. The boundary element method (BEM) was adopted to discretize the relevant equations. Open boundaries were used in far fields of the study domain. Linear waves were generated and propagated towards tandem fixed cylinders to estimate the forces applied on them. Special attention was paid to consideration of the effect on varying non-dimensional cylinder radius and distance between cylinders, ka and kd on forces and trapped modes. The middle cylinder wave forces and trapped modes in a set of nine tandem cylinders were validated utilizing analytical data. The comparisons confirm the accuracy of the model. The results of the inline wave force estimation on n tandem cylinders show that the critical cylinder in the row is the middle one for odd numbers of cylinders. Furthermore the results show that the critical trapped mode effect occurs for normalized cylinder radiuses close to 0.5 and 1.0. Finally the force estimation for n tandem cylinders confirms that force amplitude of the middle cylinder versus normalized separation distance fluctuates about that of a single cylinder.

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Authors and Affiliations

  1. Faculty of Marine Technology, Amirkabir University of Technology, Tehran, 15875-4413, Iran

    Mohammad Javad Ketabdari & Mohammad Mahdi Abaiee

  2. Department of Mechanics, Sharif University of Technology, Tehran, 145888-9694, Iran

    Ali Ahmadi

Authors
  1. Mohammad Javad Ketabdari
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  2. Mohammad Mahdi Abaiee
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  3. Ali Ahmadi
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Correspondence to Mohammad Javad Ketabdari.

Additional information

Mohammad Javad Ketabdari was born in 1964. He is currently the associate Professor of the Faculty of Marine Technology, Amirkabir University of Technology (Tehran Polytechnic). He obtained his B.Sc. degree from Isfahan University of Technology in 1986, M.Sc. degree from Engineering Faculty of Tehran University in 1992 and his PhD degree from the University of Birmingham in UK in 1999. He has published in a wide range of conferences and journals more than 200 papers addressing theoretical aspects as well as practical applications in Offshore structures, Coastal structures and marine hydraulics. He supervised BSc, MSc and PhD students in their final projects and is currently teaching Nonlinear Wave Theory and Hydrodynamics of offshore platforms for PhD students

Mohammad Mahdi Abaiee was burned in 1988. He obtained his B.Sc. degree in ship architect and received his M.Sc. degree from Amirkabir University of Technology (Tehran Polytechnic) in Naval Architect in 2012. His main field of interest is hydrodynamics of offshore structure and FSI. His knowledge in BEM referred to his M.Sc. thesis on hydrodynamics of Seastar TLP structures.

Ali Ahmadi was burned in 1987. He obtained his B.Sc. degree in ship architect and received his M.Sc. degree from Sharif University of Technology of Tehran in Naval Architect in 2012. His main field of interest is hydrodynamics of offshore structure and CFD. Ali was developed his BEM knowledge during his M.Sc. program on numerical modeling of TLP structures.

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Ketabdari, M.J., Abaiee, M.M. & Ahmadi, A. 3D numerical modeling of wave forces on tandem fixed cylinders using the BEM. J. Marine. Sci. Appl. 12, 279–285 (2013). https://doi.org/10.1007/s11804-013-1202-1

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  • DOI: https://doi.org/10.1007/s11804-013-1202-1

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