Optimisation of the Resistance and Seakeeping of the Planing Hull for the High-Speed Vessel Using ANSYS FLUENT

Poh, Ye Pin (2021) Optimisation of the Resistance and Seakeeping of the Planing Hull for the High-Speed Vessel Using ANSYS FLUENT. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Planing vessels are commonly used for military, recreational, racing and transportation purposes. It is a marine vessel whose weight is mostly supported by hydrodynamics pressures at high-speed forward motion. In the last few decades, hull is determined using experimentations with scale model in tow tank system. This method is extremely time consuming and expensive due to the tools equipment has a lot. However, there are many researchers start to use Computational Fluid Dynamics (CFD) in recent years. The purpose of this study is to optimize the resistance and seakeeping of the main geometry features of planing hull by using ANSYS FLUENT. Solidworks and ANSYS FLUENT are utilized for the hulls models construction and simulation purpose respectively. Hull 1 is a bare hull while Hull 2 is added with features such as keel line, spray rails, chines and bow shape. In the simulations, the geometries include hull, body of influence 1 (BOI 1) and body of influence 2 (BOI 2). The numerical setup for the simulations are standard k-omega turbulence model, and volume of fluid in multiphase models. Effects of the design parameters such as deadrise angle, length of keel line and chine angle on the hydrodynamic performance of the hull are investigated. Deadrise angles make the hull to reduce the resistance when travelling due to the hull rise up. In Hull 2, the deadrise angles are designed at three different locations which are at the aft perpendicular, midship and forward perpendicular. However, Hull 1 has only one deadrise angle, which is from the aft perpendicular until the bow. Spray rails in Hull 2 helps the hull rise up when travelling and reduce the contact with water as well as resistance.