Predicting the effect of biofouling on ship resistance using CFD

Yigit Kemal Demirel,Osman Turan,Atilla Incecik

doi:10.1016/j.apor.2016.12.003

Yigit Kemal Demirel, Osman Turan + Show 1 more

Open Access

https://doi.org/10.1016/j.apor.2016.12.003

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Journal: Applied Ocean Research	Publication Date: Dec 13, 2016
Citations: 143	License type: cc-by

Affiliation: University of Strathclyde

Abstract

This paper proposes a Computational Fluid Dynamics (CFD) based unsteady RANS model which enables the prediction of the effect of marine coatings and biofouling on ship resistance and presents CFD simulations of the roughness effects on the resistance and effective power of the full-scale 3D KRISO Container Ship (KCS) hull.Initially, a roughness function model representing a typical coating and different fouling conditions was developed by using the roughness functions given in the literature. This model then was employed in the wall-function of the CFD software and the effects of a typical as applied coating and different fouling conditions on the frictional resistance of flat plates representing the KCS were predicted for a design speed of 24 knots and a slow steaming speed of 19 knots using the proposed CFD model. The roughness effects of such conditions on the resistance components and effective power of the full-scale 3D KCS model were then predicted at the same speeds. The resulting frictional resistance values of the present study were then compared with each other and with results obtained using the similarity law analysis. The increase in the effective power of the full-scale KCS hull was predicted to be 18.1% for a deteriorated coating or light slime whereas that due to heavy slime was predicted to be 38% at a ship speed of 24 knots. In addition, it was observed that the wave resistance and wave systems are significantly affected by the hull roughness and hence viscosity.

Highlights

Shipping has been, and still is, one of the most important methods of transport, with more reliance and importance being placed on this mode of transport as a consequence of advances in shipping technology and the ability of ships to store and transport increasing capacities of goods
Systematic studies were performed using the flat plates covered with heavy slime and using the Kriso Container Ship (KCS) hull appended with a rudder with a smooth surface condition, in order to carry out a grid sensitivity study and to predict the CFD uncertainties
In order to observe the effect of cell numbers on the key variable, (CF in flat-plate case and CT in full-scale KCS hull case), the domain was discretised in three different resolutions and the simulations configuration

Summary

Introduction

Still is, one of the most important methods of transport, with more reliance and importance being placed on this mode of transport as a consequence of advances in shipping technology and the ability of ships to store and transport increasing capacities of goods These improvements bring some problems to the industry due to an increase in fuel consumption, which is detrimental to the environment and which erodes company revenues. Other forms of fuel power exist, such as wind energy and solar power, carbon-based fuel is currently the only way for ships to run effectively For this reason, minimising fuel consumption is crucial for shipping companies.

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