The present paper focuses on ship’s parametric roll. In particular, a series of controlled experiments have been performed in order to obtain repeatable results both for the inception and the roll amplitude in parametric roll condition for tumblehome geometry. The tests have been carried out in the INSEAN basin n. 2, that is 220 m long, 9 m wide and 3.5 m deep and equipped with a flap-type wave maker at the basin end. The model was tested in regular head waves in 3DoF condition, being roll, pitch and heave motions free and surge, sway and yaw restrained. For the restrained motions, forces and moment were measured, in order to complete the dataset. Tests were carried out for three different metacentric heights in a range of speeds. Parametric roll excitation has been observed for different metacentric heights, wave steepness and Froude number with high repeatability. This allows us to promote the collected dataset as a reliable benchmark for both CFD codes and theoretical models. The experimental work, which is the subject of the present paper, is part of cooperative research project between the IIHR (Iowa Institute of Hydraulic Research), the University of Trieste and the Italian ship model basin (INSEAN) [1, 2], while the validation of the CFD (U-RANS) and theoretical models results will be the subject of a future work, which is at present in preparation and involves other international collaborations beyond the ones listed here.

Controlled Experiments for a Tumblehome Shaped Ship in Parametric Roll Conditions

FRANCESCUTTO, ALBERTO;
2009-01-01

Abstract

The present paper focuses on ship’s parametric roll. In particular, a series of controlled experiments have been performed in order to obtain repeatable results both for the inception and the roll amplitude in parametric roll condition for tumblehome geometry. The tests have been carried out in the INSEAN basin n. 2, that is 220 m long, 9 m wide and 3.5 m deep and equipped with a flap-type wave maker at the basin end. The model was tested in regular head waves in 3DoF condition, being roll, pitch and heave motions free and surge, sway and yaw restrained. For the restrained motions, forces and moment were measured, in order to complete the dataset. Tests were carried out for three different metacentric heights in a range of speeds. Parametric roll excitation has been observed for different metacentric heights, wave steepness and Froude number with high repeatability. This allows us to promote the collected dataset as a reliable benchmark for both CFD codes and theoretical models. The experimental work, which is the subject of the present paper, is part of cooperative research project between the IIHR (Iowa Institute of Hydraulic Research), the University of Trieste and the Italian ship model basin (INSEAN) [1, 2], while the validation of the CFD (U-RANS) and theoretical models results will be the subject of a future work, which is at present in preparation and involves other international collaborations beyond the ones listed here.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2290660
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