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**Harvard**

Abolfazl, S., Leer-Andersen, M., Bensow, R. och Norrby, J. (2012) *Hydrodynamics of a Displacement Air Cavity Ship *.

** BibTeX **

@conference{

Abolfazl2012,

author={Abolfazl, Shiri and Leer-Andersen, Michael and Bensow, Rickard and Norrby, Jacob},

title={Hydrodynamics of a Displacement Air Cavity Ship },

booktitle={29th Symposium on Naval Hydrodynamics, Gothenburg, Sweden, Aug. 2012},

abstract={To study the resistance reduction of an air cavity for a
displacement vessel, a simplified model of a single cavity
is tested in a cavitation tunnel. The drag force acting
on the cavity and the aft plate were measured and
the water-air interface was monitored in different conditions.
Behavioural changes to the free surface were
observed by changing the geometry and flow characteristics
like air pressure, air flow rate and water flow speed.
Computational model for different cases with the same
geometry and conditions were simulated using computational
fluid dynamics(CFD).
The length of the cavity was designed to include approximately
2.5 times the expected wavelength of the
water-air interface with Froude number based on the
ship length of 0.19 which approximately represents a
displacement ship with multi-wave air cavity at its cruising
speed.
Parameters like cavity pressure play an important role
for the wave’s shape and the stability of the free surface
inside the cavity. Both computation and experiment
show that the amplitude of the wave is sensitive to the air
pressure in the cavity and the re-attachment of the water
to the rear end of the cavity has a close correlation
to the inlet air pressure and water velocity. The ultimate
goal of this investigation is to minimize effective power
including air supply while reducing resistance in/around
the cavity, but equally important is it to gain amore basic
understanding of the air-cavity’s behaviour and possible
additional resistance components.},

year={2012},

keywords={Air Cavity Ship, CFD, Hydrodynamics, Displacement Hull, Air Lubrication},

}

** RefWorks **

RT Conference Proceedings

SR Print

ID 162795

A1 Abolfazl, Shiri

A1 Leer-Andersen, Michael

A1 Bensow, Rickard

A1 Norrby, Jacob

T1 Hydrodynamics of a Displacement Air Cavity Ship

YR 2012

T2 29th Symposium on Naval Hydrodynamics, Gothenburg, Sweden, Aug. 2012

AB To study the resistance reduction of an air cavity for a
displacement vessel, a simplified model of a single cavity
is tested in a cavitation tunnel. The drag force acting
on the cavity and the aft plate were measured and
the water-air interface was monitored in different conditions.
Behavioural changes to the free surface were
observed by changing the geometry and flow characteristics
like air pressure, air flow rate and water flow speed.
Computational model for different cases with the same
geometry and conditions were simulated using computational
fluid dynamics(CFD).
The length of the cavity was designed to include approximately
2.5 times the expected wavelength of the
water-air interface with Froude number based on the
ship length of 0.19 which approximately represents a
displacement ship with multi-wave air cavity at its cruising
speed.
Parameters like cavity pressure play an important role
for the wave’s shape and the stability of the free surface
inside the cavity. Both computation and experiment
show that the amplitude of the wave is sensitive to the air
pressure in the cavity and the re-attachment of the water
to the rear end of the cavity has a close correlation
to the inlet air pressure and water velocity. The ultimate
goal of this investigation is to minimize effective power
including air supply while reducing resistance in/around
the cavity, but equally important is it to gain amore basic
understanding of the air-cavity’s behaviour and possible
additional resistance components.

LA eng

OL 30