Wake Wash of a Fast Small Boat in Restricted Waters: Model Tests and Full-Scale Measurements

Abstract

This paper presents the model testing of an 8.23m boat with hard chine planning hull generated waves at the Kilim recreational park. Wake is considered one of the main causes of riverbank erosion due to the energy carried by waves hitting the riverbank. Initially, ship particulars were measured from actual boats to generate a hull form using MAXSURF software. A lines plan was then generated to fabricate the model using fibreglass. Experiments were conducted in the National Hydraulic Research Institute of Malaysia (NAHRIM) at various speeds at a constant operating draft. The wave patterns generated by the modelled boats at different speeds were recorded for analysis. Wave attenuation for deep water conditions was studied and it was found that the wave exponent, n ranged from -0.36 to -0.75 for all depth Froude number (Fnh) condition. Wave decay analysis was used to estimate wave height for defined water depth. For 11 people with an average mass of 65 kg on board, the produced wave height was greater than the permissible wave wake height of 75 mm. The generated energy exceeded 60 Joules/m for nearly all measured speeds. A boat speed of less than 5 knots was suggested for boats loaded with the maximum passenger limit of 11 people. Other recommendations were made to minimize the wave wake height produced by the modelled boat.

Numerical study of trimaran wave load based on time-domain Rankine method

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Influence of the canal width and depth on the resistance of 750 DWT Perintis ship using CFD simulation

“…As a result, boat drivers must avoid sailing at crucial speeds. In addition, several previous investigations on ship-generated waves [15] and maneuverability characteristics [16] in shallow water and narrow channel can be reviewed.…”

Reconstruction of Hull Form of Traditional Croatian Fishing Vessel and Prediction of Eff ective Power

“…Thus, the combination of towing tank experiments and certain extrapolation procedures is considered to be the most reliable method even though the scaling of the viscous forces represents the main issue [13]. Towing tank tests can be used for various assessments including manoeuvring [14], seakeeping [15], wave wake characteristics [16], roll damping [17], etc. Lately, a huge potential of accurate and reliable methods based on Computational Fluid Dynamics (CFD), as an alternative to towing tank experiments, has been proven for the prediction of ship resistance and eff ective power [18].…”