### An Investigation into the Resistance Components of Converting a Traditional Monohull Fishing Vessel into Catamaran Form

*Samuel Samuel, M. Iqbal, I.K.A.P. Utama*

**Abstract**:

Resistance or drag is one

of the most important factors in ship design, in particular in connection with

the development of more efficient and environmentally friendly vessels. The

shape of the hull under water will affect the fluid flow characteristics around

the ship, hence causing the resistance to increase or decrease. If the

resistance increases, the size of main engine and subsequently, the fuel

consumption increases accordingly and this is not often anticipated by ship

designers and operators. The use of a catamaran for passenger carriers is well

known and its application for fishing vessels has received serious attention in

the last few years, due to its advantages to produce wider deck area and

smaller size of engine at the same displacement as the monohulls. The

conversion of monohull fishing vessels in Cilacap the waters into a catamaran

hull is an interesting topic in association with the development of better

fishing vessels in this region. The resistance investigation of the conversion

vessel was carried out by Computational Fluid Dynamics (CFD) approach and this

is combined with classical slender body theory. In terms of mathematical

calculation, the results between CFD and the combination of empirical formulas

and slender body theory shows such a good agreement and the difference between

the two is less than 5%. In terms of naval architecture, the results showed

that the modification of a monohull vessel into a catamaran can increase the

payload capacity up to two times. Conversely, this causes the resistance to

increase about almost four times and this is certainly unpopular for the

fishermen.

**Keywords**: Catamaran; CFD; Monohull; Resistance; Slender body

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