Study on Hydrodynamic Coefficients and Maneuverability of a Ship by Applying CFD Method
Date Issued
2015
Date
2015
Author(s)
Chiang, Yi-Tse
Abstract
The present study focuses on the development of a CFD method to calculate the hydrodynamic coefficients of a ship running in calm water, and so its maneuverability including directional stability and turning ability can be analyzed. Firstly, maneuverability related hydrodynamic coefficients are derived via hydrodynamic modeling of horizontal planar motions, and the stability indices are derived via responsive modeling. Then the CFD software ANSYS-FLUENT is applied to simulate these maneuver motions including straight forward motion, oblique towing test, rotating arm test, constant accelerating test, and rudder force test, and to obtain the corresponding hydrodynamic forces as well as hydrodynamic coefficients. The experimental data of a tanker KVLCC1 of a series of model tests carried out by National Maritime Research Institute (NMRI) of Japan are adopted for the validation of the present CFD method. In general, tankers may have not sufficient directional stability. In the present numerical study, it is also shown that the KVLCC1 tanker is unstable in direction as expected. Besides, CFD simulations also indicate that both directional stability and turning ability are improved, and the occurrence of ruder stall delayed due to the effects of rotating propeller.
Subjects
Maneuverability
Hydrodynamic Coefficients
CFD
Type
thesis
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