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Research facilities

Three major facilities in particular are relevant for CeSOS:

  • Towing Tank
  • Ocean Basin
  • Marine Cybernetics Laboratory

Further test facilities have been specially made by CeSOS, such as the means of studying sloshing in tanks.

Towing tank


The towing tank, 260m in length and 10.5 m wide, permits complex testing in waves up to a height of 0.9 m and a period in the range 0.8 – 5.5 s. Tank depth varies between 5.6 and 10 m. The dynamometers are compatible with computerised data collection and reduction. Strain-gauge dynamometers can measure towing force and undertake open-water and propulsion tests.

Test equipment for fixed and floating structures can measure:

  • Pressure
  • Forces and moments in six degrees of freedom
  • Displacement in six degrees of freedom

The ocean basin

With a suface of 80x50 m and water depth variable to a maximum of 10 m, the ocean basin is used in ship manoevering, sea-keeping, marine offshore, floating and offshore structure tests.

Both basic and applied ship and offshore problems can be addressed. Wind, waves and currents can be simulated, to provide unique testing conditions for all models of any type of fixed or floating structure. 3-dimensional wave conditions are also possible.

Marine cybernetics laboratory

MCLab is our experimental laboratory for testing ships, rigs, underwater vehicles and propulsion systems. Since 2002 it has also been a Marie Curie Training Site.

Equipment:

  • Wave-Maker System
  • Inertial Measurement Technology
  • Towing Carriage
  • Wind and Current generators

Seakeeping tests use scale models, which can be telemetered without cables thanks to a wireless ethernet connection and a micro-PC onboard.

Dimensions:

  • 40 m long
  • 6.45 m wide,
  • 1.5 m deep
  • Length of Ship Models: 1-3 m
  • Typical Scale Ratios: 75-150

More info on laboratory sites at NTNU and MARINTEK which CeSOS is free to use for planned experiments:

Sloshing tanks


Three tanks have been designed and installed to undertake sloshing experiments in CeSOS.

  • Plexiglass tank with internal dimensions of 1.0x0.6x0.6m (see Figure). This tank contains a moveable wall, so that different inner compartment sizes can be studied. A special mesh attached to the inner roof can be let down to dampen out wave motions inside. The tank has mainly been used to study three-dimensional sloshing and high-filling sloshing, using high-speed imaging to capture the sloshing-induced impact flow.
  • Plexiglass tank 1 m x 1 m x 0.1 m. This tank has been used for particle image velocimetry (PIV) and high-speed imaging of high-filling sloshing induced impacts, and also for an isolated study of low-filling impact.
  • Stiffened steel tank 0.8 m x 1.0 m x 0.8 m, with an opening for insertion of a flexible plate. This is positioned at the top of one of the tank ends. The tank has been used to study sloshing induced impacts and the effect of hydroelasticity.

Other tanks operated by MARINTEK have also been applied.


Last revised: 28 June 2006.
  
Editor in charge: Torgeir Moan. Contact the Centre
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