TY  - JOUR
PB  - Ain Shams University
N2  - In the prediction of accurate wave force, the consideration of short-crested wave is important in representing the actual ocean condition. Owing that, nonlinear wave characteristics are expected to change the flow properties when the wave passes the structures, which showing these characteristics are crucial to be accounted. However, literature reported that the overestimation on the design of marine structures has shown a lower reliability in the wave force prediction considering long-crested wave. Further in detail, the effect of wave directionality and directional spreading angle from the actual sea conditions, i.e. the short-crested waves, have been neglected in a way. To prove the validity of this statement, an experimental investigation was conducted to quantify the effects of wave directionality on the wave forces and to propose the hydrodynamic coefficients incorporated the effect of directional spreading angles. The wave directionality in term of directional spreading angles were considered, ranging from 5 to 45°. Then, the measured wave surface elevation and wave forces were processed using least square method to compute the hydrodynamic coefficients and to evaluate the wave forces. To quantify the effect, force ratio factor was adopted. Based on the finding, short-crested waves led to 20  force reduction as compared to the long-crested. On top of that, a reduction of 1.12  of wave force has also been observed for every one-degree incremental of the directional spreading angle. As conclusion, the wave directionality was found contributing to the reduction of wave force which may provide new improvement on the accuracy of wave force formulation for the design of lean marine structures. © 2021 THE AUTHORS
VL  - 13
JF  - Ain Shams Engineering Journal
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112598455&doi=10.1016%2fj.asej.2021.07.004&partnerID=40&md5=43b5b44bda509efaa20733a0709828fd
AV  - none
TI  - Effect of directional spreading angles on the wave hydrodynamic coefficients for vertical cylinder
SN  - 20904479
ID  - scholars17064
A1  - Ng, C.Y.
A1  - Tuhaijan, S.N.A.
A1  - Kurian, V.J.
A1  - Mustaffa, Z.
A1  - Yazid, E.
A1  - Kang, H.S.
Y1  - 2022///
KW  - Cylinders (shapes); Hydrodynamics; Ocean structures; Sailing vessels
KW  -  Directional spreading; Experimental investigations; Hydrodynamic coefficients; Least square methods; Ocean conditions; Short-crested waves; Vertical cylinders; Wave hydrodynamics
KW  -  Least squares approximations
N1  - cited By 1
IS  - 2
ER  -