NUMERICAL AND EXPERIMENTAL PREDICTION OF ROLL DAMPING FOR A HIGH-SPEED PLANING HULL


Creative Commons License

Yıldız B. , Kahramanoğlu E. , Çakıcı F. , Katayama T.

The 11th High Speed Marine Vehicles Symposium, Naples, Italy, 25 October 2017, pp.179-185

  • Publication Type: Conference Paper / Full Text
  • City: Naples
  • Country: Italy
  • Page Numbers: pp.179-185

Abstract

High-speed planing hulls may experience transverse instabilities due to the environmental conditions. In this regard, roll motion characteristics of planing hulls should be determined during conceptual design stage. For a better estimation of roll motion behaviors, the prediction of roll damping must be calculated with a high level of accuracy. Since the viscosity plays a dominant role for the roll motion, the existing potential methods are not sufficient to represent the real dynamics. Therefore, numerical solvers based on computational fluid dynamics (CFD) have become a powerful tool in predicting roll damping. In this study, the roll damping coefficients of a high-speed planing hull were calculated by using numerical and experimental methods. 1 DOF forced roll experiments and simulations were carried out to obtain the roll damping coefficients. The moment acting on the hull surface during forced roll oscillations was calculated to show the effect of forward speed and initial roll amplitude on roll damping. The results showed that the numerical solver is capable of predicting the roll damping coefficients in good agreement with experimental results.