CFDShip-Iowa

CFD analysis of broaching for a model surface combatant with explicit simulation of moving rudders and rotating propellers The mechanisms of broaching in following regular waves are studied by analysis of free model computations. Simulations of the fully appended ONR Tumblehome model DTMB 5613 are performed with the ship hydrodynamics code CFDShip-Iowa v4.5 and validated against experiments of an auto-piloted, self propelled model ship. Appendages include bilge keels, skeg, shafts and struts, moving rudders to control heading, and rotating propellers for self-propulsion. Proportional and proportional-integral autopilots are used. Once validated against experimental data for the proportional controller, the flow field and forces and moments on the hull and individual appendages are analyzed in detail to identify the mechanisms leading to the broaching event. It was found that several reasons contribute to the inability of the ship to overcome the hydrostatic yaw moment caused by the approaching wave. However, it is shown that the use of a slightly better autopilot prevents broaching under identical operating conditions, presenting an opportunity to extend the safe operating envelope of the ship.


References in zbMATH (referenced in 12 articles )

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  1. Carrica, Pablo M.; Sadat-Hosseini, Hamid; Stern, Frederick: CFD analysis of broaching for a model surface combatant with explicit simulation of moving rudders and rotating propellers (2012)
  2. Wackers, J.; Koren, B.; Raven, H.C.; van der Ploeg, A.; Starke, A.R.; Deng, G.B.; Queutey, P.; Visonneau, M.; Hino, T.; Ohashi, K.: Free-surface viscous flow solution methods for ship hydrodynamics (2011)
  3. Ma, J.; Oberai, A.A.; Drew, D.A.; Lahey, R.T. jun.; Moraga, F.J.: A quantitative sub-grid air entrainment model for bubbly flows-plunging jets (2010)
  4. Yang, Jianming; Stern, Frederick: Sharp interface immersed-boundary/level-set method for wave-body interactions (2009)
  5. Moraga, F.J.; Carrica, P.M.; Drew, D.A.; Jun., R.T.Lahey: A sub-grid air entrainment model for breaking bow waves and naval surface ships (2008)
  6. Carrica, P.M.; Wilson, R.V.; Stern, F.: An unsteady single-phase level set method for viscous free surface flows (2007)
  7. Campana, Emilio F.; Peri, Daniele; Tahara, Yusuke; Stern, Frederick: Shape optimization in ship hydrodynamics using computational fluid dynamics (2006)
  8. Carrica, Pablo M.; Wilson, Robert V.; Stern, Fred: Unsteady RANS simulation of the ship forward speed diffraction problem (2006)
  9. Moraga, F.J.; Larreteguy, A.E.; Drew, D.A.; Lahey, R.T. Jun.: A center-averaged two-fluid model for wall-bounded bubbly flows (2006)
  10. Wilson, Robert V.; Carrica, Pablo M.; Stern, Fred: Unsteady RANS method for ship motions with application to roll for a surface combatant (2006)
  11. Simonsen, Claus D.; Stern, Fred: Flow pattern around an appended tanker hull form in simple maneuvering conditions (2005)
  12. Carrica, P.M.; Drew, D.; Bonetto, F.; Lahey, R.T.: A polydisperse model for bubbly two-phase flow around a surface ship (1999)