CFD를 이용한 Tanker의 침로안정성 평가
Evaluation of Course Stability Performance for Tanker using CFD
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초록
The course stability performance for tankers is evaluated by computational fluid dynamics. In the present work, a Reynolds averaged Navier-Stokes (RANS) code is applied to a maneuvering problem covering the pure drift and yaw motions. The purposes of this study are to evaluate the hydrodynamic force in the bare hull (AFRAMAX) in pure drift and yaw motion and to provide information about the trends in the forces and moments when the rudder angles are varied. The flow simulation is performed by FLUENT. The CFD code is examined to find the optimistic computational condition such as size of grid, turbulence model and initial condition. The hydrodynamic derivatives in drift and pure yaw motion are estimated by the numerical simulation, and then the stability levers are calculated. It is confirmed that the computations show the superiority and inferiorityof course stability performance according to the hull forms. Finally, the CFD code is applied to the estimation of the rudder forces when the rudder angles are varied. The propeller effect expressed by the body force distribution is also included.
Abstract
The course stability performance for tankers is evaluated by computational fluid dynamics. In the present work, a Reynolds averaged Navier-Stokes (RANS) code is applied to a maneuvering problem covering the pure drift and yaw motions. The purposes of this study are to evaluate the hydrodynamic force in the bare hull (AFRAMAX) in pure drift and yaw motion and to provide information about the trends in the forces and moments when the rudder angles are varied. The flow simulation is performed by FLUENT. The CFD code is examined to find the optimistic computational condition such as size of grid, turbulence model and initial condition. The hydrodynamic derivatives in drift and pure yaw motion are estimated by the numerical simulation, and then the stability levers are calculated. It is confirmed that the computations show the superiority and inferiorityof course stability performance according to the hull forms. Finally, the CFD code is applied to the estimation of the rudder forces when the rudder angles are varied. The propeller effect expressed by the body force distribution is also included.
참고문헌 (6)
- Boo, K.T, "Simulation of Viscous Flow around Appended with the Propeller and the Rudder", Proceedings of the Annual Autumn Meeting The Society of Naval Architects of Korea, pp.527~531 (2004)
- Lee, H.S, "A Study on the Application of CFD in the Analysis of Ship Maneuverability", Proceedings of the Annual Spring Meeting The Society of Naval Architects of Korea, pp.738~743 (2004)
- Lee, S.W, "Prediction of Yaw Stability of a Towed FPSO using CFD", Proceedings of the Annual Spring Meeting The Society of Naval Architects of Korea, pp.721~725 (2004)
- Tanaka, S, "A Numerical Studyon Hydrodynamic Interaction among Obligue Ship Hull, Propeller and Rudder", Proc. Od MARSIM RC-21. (2003)
- Korea Institute of Machinery and Materials Korea Association of Naval Technology Research, "Study on Improvement of Estimation of Ship Manoeuvring Performance I,II,III" (2000), Korea Institute of Machinery and Materials Korea Association of Naval Technology Research
- Technical Report of Improvement of Ship Resistance Performance, "Korea Institute of Machinery and Materials", Korea Institute of Machinery and Materials, ~ (1998)