Optimization of a Chemical Tanker and Propeller with CFD
Author Van der Ploeg, A. and Foeth, E.-J.
Title Optimization of a Chemical Tanker and Propeller with CFD
Conference/Journal ECCOMAS Computational Methods in Marine Engineering V (MARINE 2013), Hamburg
Paper no. 253
Month May
Year 2013
Pages 101-112

In the 7th-Framework EU project “STREAMLINE” one work package was entirely devoted to the optimization of state-of-the-art propulsion. The hull form of a chemical tanker, referred to as the ‘Streamline tanker’, together with its propeller was optimized using CFD. In this paper we describe techniques for optimizing the lines of the aft body using the RANS-code PARNASSOS, together with an optimization of the propeller using the BEM code PROCAL.
The optimization of the lines of the ship was done for zero drift angle and free surface effects were not taken into account. Since scale effects in the wake field can be quite significant, the optimization was performed at full scale. Modifications aft of midship were allowed only and the displacement should not decrease. Further, the propeller location as well as the ship’s main dimensions were fixed. Constraints to guarantee sufficient room for machinery were also imposed.
The choice of object functions is of crucial importance in hull form optimization projects. Minimization of the resistance is not be the best way to reduce fuel consumption, since a decrease of the resistance is usually accompanied by a relatively strong decrease of the nominal wake fraction which can reduce the propulsive efficiency. Therefore, as a first object function we used an estimate of the required power. The second object function was a function that represents the quality of the full-scale wake. The latter can be of interest when noise and vibration on board ships, or the risk of damage to the propeller and rudder due to (erosive) cavitation has to be minimized.
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