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A PHYSICAL-MATHEMATICAL MODEL OF HYDRODYNAMIC FORCES AND MOMENT ACTING ON A HULL DURING LARGE DRIFTING AND TURNING MOTION UNDER THE CONDITIONS OF SLOW SPEED

Keiichi Karasuno, Kazuei Igarashi

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Abstract

A mathematical model of hydrodynamic forces occurring during ship turning motions while drifting, has been derived from the improved physical-mathematical model for oblique motion, derived by the author (Karasuno et al 1990). The hydrodynamic forces in the model consist of six elementary forces of fluids. They are as follows: ideal forces, viscous lift due to viscosity, induced drag, cross flow drag, cross flow lift due to the asymmetry of cross flow fore and aft, and frictional drag etc in longitudinal direction. The viscous lift, induced drag, and cross flow lift are assumed to occur mainly along the trailing and leading edges of the ship's hull, and to connect with drifting angles at both edges. Experimental data generated from a turning ship model of a pure car carrier, were incorporated within the mathematical model and resulted in good agreements.

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A mathematical model of hydrodynamic forces occurring during ship turning motions while drifting, has been derived from the improved physical-mathematical model for oblique motion, derived by the author (Karasuno et al 1990). The hydrodynamic forces in the model consist of six elementary forces of fluids. They are as follows: ideal forces, viscous lift due to viscosity, induced drag, cross flow drag, cross flow lift due to the asymmetry of cross flow fore and aft, and frictional drag etc in longitudinal direction. The viscous lift, induced drag, and cross flow lift are assumed to occur mainly along the trailing and leading edges of the ship's hull, and to connect with drifting angles at both edges. Experimental data generated from a turning ship model of a pure car carrier, were incorporated within the mathematical model and resulted in good agreements.

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Available abstract

A mathematical model of hydrodynamic forces occurring during ship turning motions while drifting, has been derived from the improved physical-mathematical model for oblique motion, derived by the author (Karasuno et al 1990). The hydrodynamic forces in the model consist of six elementary forces of fluids. They are as follows: ideal forces, viscous lift due to viscosity, induced drag, cross flow drag, cross flow lift due to the asymmetry of cross flow fore and aft, and frictional drag etc in longitudinal direction. The viscous lift, induced drag, and cross flow lift are assumed to occur mainly along the trailing and leading edges of the ship's hull, and to connect with drifting angles at both edges. Experimental data generated from a turning ship model of a pure car carrier, were incorporated within the mathematical model and resulted in good agreements.

Key concepts: Drag, Mechanics, Lift (data mining), Hull, Classical mechanics, Lift-to-drag ratio, Physics, Drag equation

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A PHYSICAL-MATHEMATICAL MODEL OF HYDRODYNAMIC FORCES AND MOMENT ACTING ON A HULL DURING LARGE DRIFTING AND TURNING MOTION UNDER THE CONDITIONS OF SLOW SPEED — Research Paper | ScholarLens