Extraction of hydrodynamic coefficients applying planning mechanism motion maneuver using computational fluid dynamics

Authors

1 Researcher, Dept. Marine Sci. and Eng., Malek-e AshtarUnivercity of Technology., Isfahan, Iran

2 faculty of Dept. Marine Sci. and Eng., Malek-e Ashtar Uni. Tech., Isfahan, Iran

Abstract

This article describes how to extract some hydrodynamic coefficients of an underwater vehicle using computational fluid dynamics, and has been implemented on DARPA Suboff geometric model. In this article, a procedure has been provided to efficiently extract hydrodynamic coefficients, without using mesh regeneration for each maneuver. In this method by using simulation of some standard dynamic maneuvers, such as pure yaw and pure sway, a number of hydrodynamic coefficients have been obtained such as Y_v , Y_v ̇ , N_v , N_v ̇ and Y_r , Y_r ̇ , N_r, N_r ̇ . The parameters, required for numerical analysis, are geometry, center of mass and velocity of underwater vehicle. Using numerical analysis, hydrodynamic forces and moments have been ploted as functions of time. Hydrodynamic coefficients in relevant to the desired geometry is derived by investigation on the equations of motion in sinusoidal maneuver at specific points such as zero lateral velocity or zero acceleration points. The results of the present procedure have been compared with the experimental results that reported in the literature and a good agreement between analytical and experimental results has been observed.

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Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 8, Issue 1
April 2018
Pages 215-228

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