To evaluate theinfluence of dof on manoeuvring predictions by direct CFD zig-zag simulations
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Inclou dades d'ús des de 2022
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hdl:2117/330279
Tipus de documentText en actes de congrés
Data publicació2019
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
In this paper, direct CFD zig-zag simulations of 10°/10° and 20°/20° are
performed in deep water condition under the consideration of different degrees of freedom, namely 3
DOF, 4 DOF, and 6 DOF, to evaluate their influence on manoeuvring predictions. A modern container
ship KCS with a slightly simplified semi-balanced rudder is chosen as the benchmark model.
All simulations are conducted in the numerical environment FINETM/Marine with
the ISIS-CFD code as the flow solver. It solves impressible unsteady RANS equations in
full hexahedral unstructured meshes and implicitly couples the flow field with motion equations of
a rigid body in 6 DOF. Current direct manoeuvring simulations are achieved by means of the
overlapping grid technique. To reduce the computational effort, propeller effect is
modelled by a simple prescribed body force model. Trajectories are straightforward
recorded without any further treatment to extract hydrodynamic derivatives. The prediction accuracy
is evaluated by comparing derived parameters, i.e. overshoot angles and times, peak yaw rates,
drift angles, etc. against experimental data. In conclusion, 4 DOF and 6 DOF concept present
similar results for current ship type. The tiny changes in pitch and heave motion indicate they can
be neglectable to simplify the complex mesh strategy. In addition, the large roll angle over
zig-zag manoeuvres implies that 4 DOF concept should be more reasonable for container ships to
obtain roll-motion-related data. Meanwhile, 3 DOF concept underestimates all overshoot angles
in each simulation. This also highlights the reasonability of 4 DOF concept.
CitacióGao, X.; Deng, G. To evaluate theinfluence of dof on manoeuvring predictions by direct CFD zig-zag simulations. A: MARINE VIII. "MARINE VIII : proceedings of the VIII International Conference on Computational Methods in Marine Engineering". CIMNE, 2019, p. 658-669. ISBN 978-84-949194-3-5.
ISBN978-84-949194-3-5
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