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Numerical Modelling of the Effects of Biofouling on Ship Resistance and Propulsion Characteristics

Biofouling is the accumulation of microorganisms, plants, algae, or animals on wetted surfaces and it represents a growing problem from both economic and environmental point of view. Even though it occurs in many different fields, shipping industry is the most affected by the settlement and the growth of biofouling organisms. Ship hull roughness is increased because of presence of biofouling organisms and consequently, hydrodynamic performance of a ship is reduced, which results in increased fuel consumption, reduction of the ship speed and increased emission of harmful gases. Presently, there is no comprehensive procedure which could reliably predict the effect of biofouling on the ship hydrodynamic characteristics. The importance of the assessment of these effects was recognized by the International Towing Tank Conference (ITTC), which highlighted the importance of a development of a new formulae or methods based on the experimental data for evaluation of these effects. Within this work, numerical procedure for prediction of the effect of biofouling on the hydrodynamic characteristics of ship resistance and propulsion in calm water will be developed.

Computational Fluid Dynamics (CFD) ; biofouling ; roughness functions ; resistance characteristics ; propulsion characteristics

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