eprintid: 12468 rev_number: 2 eprint_status: archive userid: 1 dir: disk0/00/01/24/68 datestamp: 2023-11-10 03:27:01 lastmod: 2023-11-10 03:27:01 status_changed: 2023-11-10 01:48:49 type: article metadata_visibility: show creators_name: Ng, C.Y. creators_name: Tuhaijan, S.N.A. creators_name: Fattah, M.Z.A. creators_name: John Kurian, V. creators_name: Mustaffa, Z. title: Experimental investigation of directional hydrodynamic coefficients and the effects on wave force due to spreading angles ispublished: pub keywords: Hydrodynamics; Least squares approximations; Offshore structures; Water waves; Wave energy conversion, Directional spreading; Hydrodynamic coefficients; Keulegan-carpenter number; Short-crested waves; Wave-structure interaction, Sailing vessels note: cited By 4 abstract: Assessment of wave forces in the design of marine structures considering real ocean properties were reported better represented by short-crested wave statistics. Henceforth, this paper aims to investigate the effect of directional spreading angles for short-crested wave on the prediction of wave forces and hydrodynamic coefficients. The wave surface elevation and forces exerted on bottom fixed vertical cylindrical models in the wave tank by waves with directional spreading angles ranging from 0 to 45 deg were measured experimentally. Based on the measured data, directional hydrodynamic coefficients as function of Keulegan-Carpenter (KC) numbers were derived numerically by the least square method and its effects were analyzed. Force reduction was found due to the directional spreading angles, whereby 1.20 percent of total wave force were reduced with every one deg of angle incremental. Overall, greater reductions are expected for bigger angles as the wave energy distribution area is expected to be increased. © 2020 Faculty of Engineering, Ain Shams University date: 2020 publisher: Ain Shams University official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85080098729&doi=10.1016%2fj.asej.2020.01.012&partnerID=40&md5=40440c698c3e52495a94eb4d23f8d740 id_number: 10.1016/j.asej.2020.01.012 full_text_status: none publication: Ain Shams Engineering Journal volume: 11 number: 4 pagerange: 1021-1034 refereed: TRUE issn: 20904479 citation: Ng, C.Y. and Tuhaijan, S.N.A. and Fattah, M.Z.A. and John Kurian, V. and Mustaffa, Z. (2020) Experimental investigation of directional hydrodynamic coefficients and the effects on wave force due to spreading angles. Ain Shams Engineering Journal, 11 (4). pp. 1021-1034. ISSN 20904479