Semi-Displacement Vessel Including Applications to Calm-Water Broaching

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1 Potential-Flow Predictions of a Semi-Displacement Vessel Including pplications to Calm-Water roaching CeSOS Conference 29-May-2013 abak Ommani 29-May-2013, CeSOS Conference CeSOS Centre abak for Ships Ommani and Ocean Structures 1

2 Semi-Displacement Vessels Fn 0.4 ~ 1.2 Fn U / Lg Fabbri et al. 2009, INSEN 29-May-2013, CeSOS Conference abak Ommani 2

3 Semi-Displacement Vessels Force Submerged Volume Hydrostatic Hydrodynamic Velocity squared Conventional Semi-Displacement Planning Hydrofoil Increase in the Role of Hydrodynamic Force Comparing to Hydrostatic Dynamic instability!! 29-May-2013, CeSOS Conference abak Ommani 3

4 General types of instability Increasing Froude number roaching Non-oscillatory Cohen and lount, May-2013, CeSOS Conference abak Ommani 4

5 Calm-Water roaching Lugni et al. 2004, INSEN 29-May-2013, CeSOS Conference abak Ommani 5

6 Equations of Motion Sway acc. vel. Linear decomposition U Y Z X y z CG x Roll Yaw 18 Coeffs May-2013, CeSOS Conference abak Ommani 6

7 Overview Introduction Numerical Implementation dvancing and Oscillating Flat Plate Linear Dynamic Stability nalysis Conclusions 29-May-2013, CeSOS Conference abak Ommani 7

8 Numerical Implementation 2 Potential flow 0 Neumann-Kelvin Linearization Ux Linearized ody oundary Condition Mean body position Linearized Free-Surface oundary Condition Mean free surface Initial Condition, Radiation Condition Linearized pressure on the body p U gz t x Forces and moments F j S pn ds j 29-May-2013, CeSOS Conference abak Ommani 8

9 Numerical Implementation Rankine Panel Method G p, q C( p) p q ds nq ( ) q G p, q ds nq ( ) Collocation Method Discretization S S 29-May-2013, CeSOS Conference abak Ommani 9

10 Simplification Transfer to center plane Semi-Displacement vessel to a Flat Plate y z CG x U Y Z X L H 29-May-2013, CeSOS Conference abak Ommani 10

11 Oscillatory motion of a Plate z x VS y FS ody Conservation of Vorticity Time-domain solver Y Z X Fourth order Runge-Kutta 29-May-2013, CeSOS Conference abak Ommani 11

12 Sway Motion Fn 0.96 =H/L=0.2 L/ g Fn 0.32 =H/L=0.2 L/ g 29-May-2013, CeSOS Conference abak Ommani 12

13 Vessel Model Vessel M 29-May-2013, CeSOS Conference abak Ommani Lugni et al. 2004, INSEN 13

14 Dynamic Stability nalysis ack to the simplified model Surface piercing flat plate dvancing and oscillating Hydrodynamic coefficients Sway-yaw (8 coeffs.) Sway-yaw-roll (18 coeffs) Frequency and Froude number dependent Computed ( Fn, ) ( Fn0, 0) plane Extrapolated 29-May-2013, CeSOS Conference abak Ommani 14

15 Dynamic Stability Sway-Yaw analysis, Computational Domain ( Fn0, 0) Harmonic Motion a e st a i Stable every where Sway-Yaw Free-system response frequency 29-May-2013, CeSOS Conference abak Ommani 15

16 Dynamic Stability Sway-Roll-Yaw analysis, 22 Computational Domain ( Fn0, 0) 18 Coeffs C s C s C s C1s C0 0 * s, s s, s * Two Frequencies? Time-Domain analysis is needed 29-May-2013, CeSOS Conference abak Ommani 16

17 Dynamic Stability Sway-Roll-Yaw analysis, 22 Computational Domain ( Fn0, 0) 18 Coeffs C s C s C s C1s C0 0 * s, s s, s * Two Frequencies? Time-Domain analysis is needed Sway-Yaw Free-system response frequency 29-May-2013, CeSOS Conference abak Ommani 17

18 Dynamic Stability Sway-Roll-Yaw analysis, 22 Computational Domain Stable every where 18 Coeffs C s C s C s C1s C0 0 * s, s s, s * Two Frequencies? Time-Domain analysis is needed Sway-Yaw Free-system response frequency Roll Free-system response frequency 29-May-2013, CeSOS Conference abak Ommani 18

19 Dynamic Stability Sway-Roll-Yaw analysis, sensitivity Many uncertain parameters Hydrodynamic coefficients Due to simplification Vessel geometrical properties Due to insufficient data GM KM KG GM KM KG 29-May-2013, CeSOS Conference abak Ommani 19

20 Dynamic Stability Sway-Roll-Yaw analysis, sensitivity (1 v) 29-May-2013, CeSOS Conference abak Ommani 20

21 Dynamic Stability Sway-Roll-Yaw analysis, sensitivity Unstable roots 29-May-2013, CeSOS Conference abak Ommani 21

22 Dynamic Stability Sway-Roll-Yaw analysis, Computational Domain KG D Computational Domain 29-May-2013, CeSOS Conference abak Ommani 22

23 Dynamic Stability Sway-Roll-Yaw analysis, KG D 0.5 Computational Domain Sway-Yaw Free-system response frequency 29-May-2013, CeSOS Conference abak Ommani 23

24 Dynamic Stability Sway-Roll-Yaw analysis, KG D 0.5 Roll Free-system response frequency Computational Domain Sway-Yaw Free-system response frequency 29-May-2013, CeSOS Conference abak Ommani 24

25 Dynamic Stability Sway-Roll-Yaw analysis, KG D 0.5 Roll Free-system response frequency Unstable System a1 0 Re( s1 ) s, s * Im( s1 ) Computational Domain Sway-Yaw Free-system response frequency Recorded Instability 29-May-2013, CeSOS Conference abak Ommani 25

26 Dynamic Stability Sway-Roll-Yaw analysis, KG D 0.5 Roll Free-system response frequency Unstable System a1 0 Re( s1 ) s, s * Im( s1 ) Computational Domain Sway-Yaw Free-system response frequency 29-May-2013, CeSOS Conference abak Ommani 26

27 Conclusions simplified hydrodynamic model is used for semidisplacement vessel. Roll motion influences the dynamic stability in sway and yaw. Cross coupling hydrodynamic coefficients matter. It seemed that high stiffness in Roll can cause instability in sway-yaw!! It was not possible to capture instability induced by Loss of restoring moment in Roll Simplified hydrodynamic model may be the reason 29-May-2013, CeSOS Conference abak Ommani 27

28 Thank you! 29-May-2013, CeSOS Conference abak Ommani 28

29 References Chapman, R. (1975), Numerical solution for hydrodynamic forces on a surface-piercong plate oscillating in yaw and sway, in `Proc. 1st International Conference on Numerical Ship hydrodynamics', ethesda, MD,US, pp Fabbri, L., Di Memmo,., Palini, M. and Lugni, C. (2009), Prova di manovrabilita su uno scafo semidislocante, Technical Report rt, INSEN, Rome, Italy. Faltinsen, O.M. (2005). Hydrodynamics of High-Speed Marine Vehicles. New York: Cambridge University Press. Lugni, C., Colagrossi,., Landrini, M. and Faltinsen, O. (2004), Experimental and numerical study of semi-displacement monohull and catamaran in calm water and incident waves, in `Proc. of 25th Symposium on Naval Hydrodynamics', Canada. Ommani, abak, and O. M. Faltinsen Study on Linear 3D Rankine Panel Method for Prediction of Semi-Displacement Vessels Hydrodynamic Characteristics at High Speed. In Proceedings of the 11th International Conference on Fast Sea Transportation (FST 2011). Honolulu, HI, US. Ommani, abak, O. M. Faltinsen, and C. Lugni Hydrodynamic Forces on a Semi-Displacement Vessel on Straight Course with Drift ngle. In Proceedings of the 10th International Conference on Hydrodynamics (ICHD). St. Petersburg, Russia. Ommani, abak, O. M. Faltinsen, Linear dynamic stability analysis of a surface piercing plate advancing at high forward speed. ccepted for publication in, Proceedings of the SME nd International Conference on Ocean, Offshore and rctic Engineering(OME2013). Nantes, France. van den rug, J.., eukelman, w. and Prins, G. J. (1971), Hydrodynamic forces on a surface piercing at plate, Technical Report 325, Delft University of Technology, Ship uilding Labratory May-2013, CeSOS Conference abak Ommani 29

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