Wave drift forces on two floating bodies arranged side by side

Abstract

An innovative hydrodynamic theory and numerical model were developed to help improve the efficiency, accuracy, and convergence of the numerical prediction of wave drift forces on two side-by-side deepwater floating bodies. The wave drift forces were expressed by the double integration of source strength and the corresponding Green function on the body surface, which is consistent with the far field formula based on momentum conservation and sharing the advantage of near field calculations providing the drift force on each body. Numerical results were validated through comparing the general far field model and pressure integral model, as well as the middle field model developed using the software HydroStar.

Keywords

wave drift forces / floating body / side by side / panel method

References

[1] Chen XB (2004). Hydrodynamics in offshore and Naval Applications. Keynote lecture at the 6th International Conference on Hydrodynamics, Perth.

[2] Dai Y.S. Potential flow theory of ship motions in waves in frequency and time domain, 1998, Beijing: The National Defense Industries Press

[3] Dai Y.S., Duan W.Y. Potential flow theory of ship motions in waves, 2008, Beijing: The National Defense Industries Press

[4] Duan W.Y., Dai J., Zhao B.B. Wave drift forces on two ships arranged side by side in waves. The 4th International Workshop on Applied Offshore Hydrodynamics, 2009, Brazil: Rio

[5] Fang MC, Chen GR (2002). On there-dimensional solutions of drift force and moments between two ships in waves. J. Ship Res., 46, No.4

[6] Kashiwagi W. Wave drift forces and moments on two ship arranged side by side in waves. Ocean Engineering, 2005, 32: 529-555

[7] Maruo H. The drift of a body floating on waves. J. Ship Res., 1960, 4: 1-10

[8] Pinkster J.A., Van Ortmerssen G. Computation of the first and second order wave forces on bodies oscillating in regular waves. Second International Conference on Numerical Ship Hydrodynamics, 1977, Berkeley: University of California

[9] Wang RS (1992). Numerical approach for three dimensional free surface Green function and its derivatives. Journal of Hydrodynamics, Ser.A, 7(3). (in Chinese)