Numerical investigation of the seakeeping of a Flettner rotors-propelled catamaran in beam waves
Résumé
This paper deals with the seakeeping of a catamaran propelled by Flettner rotors. The
case study is a specific design of an energy ship. The prediction of the roll motion of such a ship
is of particular interest since she will mostly sail in beam seas. We used a numerical model based
on the boundary element method (BEM) to deal with the interactions of the ship with waves. It is
supplemented by a model for the aerodynamic damping effect due to the rotors and by the ITTC
correction for roll damping. In the present study, it has been assumed that the Flettner rotors can be
modelled as a distribution of elementary airfoils whose lift and drag depend on the local apparent wind
speed. Interaction effects between the rotors and between the hull and rotors have been neglected.
Regular waves have been investigated. For the considered case study, it is found that the Flettner
rotors have a small negative damping effect on the ship motion.
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