NUMERICAL AND EXPERIMENTAL EVALUATION OF CALM WATER RESISTANCE AND INTERFERENCE EFFECTS FOR HYDROFOIL-ASSISTED SWATH
DOI:
https://doi.org/10.11113/jm.v49.762Keywords:
hydrofoils, multihull resistance, SWATH, Calm water resistance, interference effect, CFD OpenFOAMAbstract
The purpose of this study is to evaluate the interference factor of a conventional Small Waterplane Area Twin Hull (SWATH) vessel with and without the hydrofoils in calm water. While integrating hydrofoils into SWATH designs can reduce wetted surface area and improve hydrodynamic efficiency, it also introduces complex hydrodynamic phenomena and interference effects at the free surface. Conventional methods for calculating interference factors have proven inadequate for hydrofoil-assisted SWATH designs, necessitating a more robust analytical approach. To address this, a modified equation using the resistance coefficient was developed, specifically considering the running wetted surface area of each individual component of the vessel. The methodology involved the construction of a SWATH model featuring passive NACA 0015 hydrofoils in a tandem configuration at the forward and aft ends. Resistance tests were conducted in a towing tank across a range of Froude numbers (Fr) from 0.28 to 0.48, complemented by numerical simulations performed using OpenFOAM to analyze the flow field and wave patterns. A central aspect of this study is the implementation of a new formula for the interference factor that accounts for the dynamic change in the running wetted surface area of the demi-hulls and hydrofoils to improve calculation accuracy. Results indicated that the addition of hydrofoils increased the total resistance coefficient by average 21%. Despite this increase, the hydrofoils significantly improved pitch and heave motions by providing essential dynamic lift. Notably, numerical results identified a zone of beneficial (destructive) wave interference at Fr = 0.38, where overall wave making energy was effectively reduced. The study concludes that hydrofoil-assisted SWATH exhibits a higher interference factor than the bare hull. Furthermore, the findings demonstrate that conventional equations are unsuitable for hydrofoil-integrated multihulls, validating the necessity of the modified resistance coefficient equation introduced in this work.
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