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

Motallebi Mohammad, Ghafari Hamidreza, Ghassemi Hassan, Shokouhian Mehdi

Zeszyty Naukowe Akademii Morskiej w Szczecinie

2020

nr 62 (134)

108--115

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.

Potential-based boundary element method to calculate the hydrodynamic drift force on the floating cylinder

Ghafari Hamidreza, Motallebi Mohammad, Ghassemi Hassan

Journal of Applied Mathematics and Computational Mechanics

2020

Vol. 19, nr 4

69--79

This paper presents the calculation of the hydrodynamic drift force by using the potetial-based boundary element method (BEM). The potential theory and far-field wave drift forces solution will be described. The comparison of non-dimensional drift force for surge and heave motions are in good agreement between numerical and experimental data. The effect of different drafts and the radius of a cylinder on the drift forces (surge, heave and pitch) are presented and discussed.