Computational analysis of asymmetric water entry of wedge and ship section at constant velocity

Rahaman, Md. Mashiur; Ullah, Al Habib; Afroz, Laboni; Sharmin, Shabnam; Sarkar, Mrinmoy

doi:10.1063/1.4958391

Cited by 1 publication

(1 citation statement)

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“…On one hand, different researchers have emphasized that bow section of the ships may reenter water with heave, roll, and sway motions and have thus conducted analyses of the oblique or asymmetric water entry. [4][5][6][7][8][9][10] On the other hand, the solution of water entry problem may be helpful in modeling the steady motion of planing hulls [11][12][13][14] or their dynamics in waves [15][16][17] by applying the 2D+T theory. When the impact is considered to occur at a constant speed, the vertical motions can be determined, while in the cases of free fall motion, the transverse motion can be simulated.…”

Section: Motivationmentioning

confidence: 99%

Dynamic response of a wedge through asymmetric free fall in 2 degrees of freedom

Ghadimi

Tavakoli

Dashtimanesh

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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In this article, a mathematical model is presented for simulation of the coupled roll and heave motions of the asymmetric impact of a two-dimensional wedge body. This model is developed based on the added mass theory and momentum variation. To this end, new formulations are introduced which are related to the added mass caused by heave and roll motions of the wedge. These relations are developed by including the asymmetrical effects and roll speed. In addition, by considering the roll speed, a particular method is presented for the time derivative of half-wetted beam of an asymmetric wedge. Furthermore, two equations are derived for the roll and heave motions in which damping terms appear. Validity of the proposed method is verified by comparing the predicted results against available experimental data in two conditions of roll motion and no roll motion. Favorable agreement is observed between the predicted results and experimental data. The pressure and hydrodynamic load are computed, and the differences between the results associated with the considered conditions are explored. Subsequently, the effects of different physical parameters including deadrise angle, initial roll angle, and initial velocity on the dynamic response of a two-dimensional wedge section are investigated. Ultimately, time histories of hydrodynamic coefficients are determined in order to provide a better understanding of the derived equations.

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