Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Simulation-Based Determination of Hydrodynamic Derivatives and 6DOF Motion Analysis for Underwater Vehicle

시뮬레이션 기반 수중 운동체의 유체력 미계수 결정 및 6자유도 운동해석

  • Go, Gwangsoo (School of Naval Architecture and Ocean Engineering, University of Ulsan) ;
  • Ahn, Hyung Taek (School of Naval Architecture and Ocean Engineering, University of Ulsan) ;
  • Ahn, Jin-Hyeong (The 6th Research and Development Institute, Agency for Defense Development)
  • 고광수 (울산대학교 조선해양공학부) ;
  • 안형택 (울산대학교 조선해양공학부) ;
  • 안진형 (국방과학연구소 제 6 기술연구본부)
  • Received : 2017.08.23
  • Accepted : 2017.10.26
  • Published : 2017.10.31
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Abstract

This paper introduces a simulation-based determination method for hydrodynamic derivatives and 6DOF (degrees-offreedom) motion analysis for an underwater vehicle. Hydrodynamic derivatives were derived from second-order modulus expansion and composed of the added mass, and linear and nonlinear damping coefficients. The added mass coefficients were analytically obtained using the potential theory. All of the linear and nonlinear damping coefficients were determined using CFD simulation, which were performed for various cases based on the actual operating condition. Then, the linear and nonlinear damping coefficients were determined by fitting the CFD results, which referred to 6DOF forces and moments acting on an underwater vehicle, with the least square method. To demonstrate the applicability of the current study, 6DOF simulations for three different scenarios (L-, U-, and S-turn) were carried out, and the results were validated on the basis of physical plausibility.

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References

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