Planar motion modeling of full-scale SUBOFF in deep and unlimited water

This paper proposes a numerical approach to predict the planar motion of a full-scale SUBOFF as well as its hydrodynamic coefficients in deep and unlimited water, where the free surface and wall effects are neglected. The Euler’s equations of motions are employed to describe the underwater motion of a body in deep submergence. Due to the geometrical features of the studied hull form, a simplified form of motion equations is obtained through ignoring minor equation terms in the case of planar motions. A linear approach is further adopted to estimate the added mass and damping coefficients of the submerged vessel, where the coefficients of main components of vessel, such as hull, sail, sail fin, stern fin, and rudder, Fig.1, are separately evaluated and then integrated into the simplified motion equations. The turbulent flow around these components are numerically calculated to predict their hydrodynamic coefficients, where a grid-independent solution is predicted via a successive grid refinement of the computational domain. The solution of the simplified motion equations is based on a time-marching scheme. An iterative method is first used to solve the simplified motion equations at a given instance and a first-order projection method is then employed to predict the position and status of the vessel at the next time step.

Subjects

Computational Fluid Dynamics (CFD)

Hydrodynamic coefficients

Ship motion modeling

SUBOFF

DDC Class

600: Technik

620: Ingenieurwissenschaften

More Funding Information

This paper is financially supported by the Ministry of Science and Technology, ROC under the Project No. MOST 106-2218-E-002-035.

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http://rightsstatements.org/vocab/InC/1.0/

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paper_0065_file_0487_Planar_Motion_Modeling_of_Full_Scale_SUBOFF_in_Deep_and_Unlimite.pdf

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Planar motion modeling of full-scale SUBOFF in deep and unlimited water