6DOF Simulation and Determination of Hydrodynamic Derivatives of Underwater Tow-Fish Using CFD

CFD를 이용한 수중 예인체의 유체력 미계수 결정과 6자유도 운동해석

  • Received : 2016.04.24
  • Accepted : 2016.08.10
  • Published : 2016.08.20


Techniques for determinating hydrodynamic derivatives of underwater tow-fish using CFD(Computational Fluid Dynamics) are described in this paper. Main components of hydrodynamic derivatives are added mass, linear damping and non-linear damping coefficients. In this study, linear and non-linear damping coefficients for translational velocities are settled by CFD analysis. In order to analyze the underwater tow-fish, UlsanFOAM based on open-source CFD code, namely OpenFOAM, is employed. By simulating pitch and yaw angle variation of underwater tow-fish, 6DOF(Degree-of-Freedom) forces and moments are estimated at each attitudes. In order to determinate the hydrodynamic derivatives, curves(forces and moments vs attitude) for CFD results are fitted by least square methods. To demonstrate the applicability of the current approach, two different problems(impulsive side towing and straight towing) are simulated and all results are validated.


Underwater tow-fish;Hydrodynamic derivatives;Computational Fluid Dynamics(CFD)


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