Computation of Turbulent Free-Surface Flows Around Ships and Floating Bodies

Beschreibung

The long-term vision in numerical ship hydrodynamics is to simulate the behaviour and performance of full scale ships under real operating conditions, and in this way to get rid of tank tests and their uncertainties in the model-ship correlation and other limitations such as costs and delivery time. The numerical methods should be able to predict ship performance en route, ship manoeuvrability in open and restricted waters as well as ship behaviour in waves. For ship performance en route the required delivered power at the propeller is important. This depends on the ship resistance in the steady-state sailing condition and on the propeller-hull interaction. The task of Computational Fluid Dynamics (CFD) in this matter would be to simulate the full scale propulsion test, inc1uding all resistance components (viscous, wave, wind, etc.) and the unsteady propeller flow. Ship manoeuvring is still a more complicated task: the propeller-rudder-hull interaction has to be taken into account and the computations have to be able to handle a highly turbulent asymmetrical flow over the hull, boundary layer separation and re-attachment as well as complicated wave patterns. Ship behaviour in a seaway is important from the point of view of ship safety, as well as with regard to added resistance in waves and thus sustained speed. A big challenge in numerical ship hydrodynamics is to accurately simulate the ship manoeuvring in waves inc1uding all non-linearities and viscous effects.

Autor*in

Rodrigo Azcueta Repetto

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Fluiddynamic free surface shipbuilding

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