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Conference Proceedings Vol. I, II, III

 事業名 海事シミュレーションと船舶操縦に関する国際会議の開催
 団体名 日本船舶海洋工学会 注目度注目度5


4.3 Oblique motion with propeller
 
 Fig. 13 presents an example of computed flow around a ship with rudder and propeller in a oblique motion, β =10.0deg., δ=10deg condition. The effect of propeller is applied CFD simulation by using the infinitely bladed propeller model.
 
Fig. 13 
An example of computed flow around a ship with propeller in a oblique motion.
 
 Fig.14 shows the comparison of calculated wake distribution of propeller acting in oblique motion. It is shown that a propeller accelerated flow of the rudder circumference is shortened by oblique motion and by taking a rudder angle.
 
Fig.14 
Comparison of calculated wake distribution at A.P. section in oblique motion
 
a) β=0.0deg., δ=0deg., with propeller
 
b) β=10.0deg., δ=0deg., with propeller
 
c) β=15.0deg., δ=0deg., with propeller
 
d) β=10.0deg., δ=-10deg., with propeller
 
5. CONCLUSION
 In this study, the authors applied CFD simulation techniques, expected to yield a variety of applications in the field of maneuverability predictions for ships, from view point of the flow around rudder behind hull and propeller during oblique motion. CFD simulations were used to calculate the interactive force from the rudder acting on the hull and the rudder normal force characteristics behind the ship. The simulation results were compared to observations from scale model tests. CFD simulations were found to predict with accuracy changes in rudder normal force behind the ship generated during oblique motion.
 A number of areas require further investigation. For example, we need to ascertain whether CFD simulations are suitable for evaluating the impact on the rudder force by factors such as the turning motion of the ship's hull and hull design.
 
REFERENCES
[1]Ishiguro T., Tanaka S. and Yoshimura Y."A Study on the Accuracy of the Recent Prediction Technique of Ship's Manoeuvrability at Early Design Stage", Proceedings of the International Conference MARSIM '96, Copenhagen, 1996
[2]Matsumoto N. and Yumuro A. "Interference Effects of Hydrodynamics between Hull, Rudder and Propeller", Prediction of Ship Manoeuvrability and its Applications, 4th Marine dynamics symposium, The Society of Naval Architects of Japan, 1987
[3]Yasukawa H. and Ohmori T. "CFD Analysis of Hydrodynamic Forces Acting on Manoeuvring Ships", Current Researches on Standards for Manoeuvrability, Load Line and Stability of Ships, Japan Towing Tank Committee Symposium, The Society of Naval Architects of Japan,2000
[4]Miyazaki H., Nonaka K., Nimura T. and Ueno M. "Study of Interaction between Ship Hull and Rudder by Computation", Journal of the Society of Naval Architects of Japan, vol 189,2001
[5]Izumi K., Sato T. and Miyata H. "CFD Simulation of Maneuvering Motion for Blunt Ships", Journal of the Society of Naval Architects of Japan,vol 184, 1998
[6]Sato T., Izumi, K. and Miyata H."Numerical Simulation of Manoeuvring Motion", 22nd Symposium on Naval Hydrodynamics, Washington D.C., 1998
[7]Ogawa A. and Hamamoto M. "Mathematical Models of Manoeuvring Motions", Proceedings of The 3rd Symposium on Ship Manoeuvrability, The Society of Naval Architects of Japan, 1981
[8]lnoue S., Hirano M., Kijima K. and Takashina J. " A Practical Calculation Method of Ship Manoeuvring Motion", Int. Shipbuilding Progress,vol 28, 1981
[9]Kodama, Y.:"Scope of CFD for Computing Ship Flows", Proc. 3rd Osaka Colloquium on Advanced CFD Applications to Ship Flow and Hull Form Design, 1998







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