In 1957 MARIN, then named NSMB, built the Seakeeping Basin, which was one of the first basins with the capability of generating waves from arbitrary directions with respect to the course of a free-running ship model. This rich history has culminated in a broad expertise in the areas of seakeeping of conventional and unconventional ships and ocean-going vehicles, combining both experimental and extensive numerical tools. In the year 2000 the new state-of-the-art Seakeeping and Manoeuvring Basin was opened, of which many MARIN customers recognized the unique capabilities and efficiency. An extensive experimental tool box has been developed to model many model specific details such as active fins, anti-roll tanks, dynamic positioning capability, the launch & recovery of small crafts and many others. Segmented models are used to study whipping and aft-body and bow-flare slamming.
The seakeeping tests play a role in concept development, in the engineering of specific aspects of a design and in the design verification. Not only operational aspects such as passenger comfort, added resistance and (in)voluntary speed loss are investigated, but safety issues are also studied. Several forensic studies have been performed into the possible cause of ship losses at sea. The feedback on our predictions and initial numerical assessments obtained in this way has boosted our expertise. Combined with the on-going research studies, this gives a state-of-the-art insight into the behaviour of the vessel under all conditions.
Seakeeping and its impact on safety and performance cover an area of expertise that is still under development. The fact that predictions of contemporary numerical tools are still incomplete and limited in accuracy makes tests with scale models indispensable in many assessments. The accumulated know-how and the advanced experimental techniques make MARIN an attractive partner in many Joint-Industry Projects with a focus on seakeeping. Apart from the research and tool development in Cooperative Research Ships (with a focus on wave loads, added resistance, motion control and the specific seakeeping of catamarans, SWATH ships and trimarans) and work in the Cooperative Research Navies (with a focus on stability and survivability of intact and damaged ships), research has been carried out in the areas of wave loads and motion control of high-speed ships, roll and side-shell loads of FPSO’s. The translation of seakeeping in risk and performance lead to a the development of a voyage simulation tool in the SAFETRANS JIP.
Seakeeping and its impact on safety and performance cover an area of expertise that is still under development. The fact that predictions of contemporary numerical tools are still incomplete and limited in accuracy makes tests with scale models indispensable in many assessments. The accumulated know-how and the advanced experimental techniques make MARIN an attractive partner in many Joint-Industry Projects with a focus on seakeeping. Apart from the research and tool development in Cooperative Research Ships (with a focus on wave loads, added resistance, motion control and the specific seakeeping of catamarans, SWATH ships and trimarans) and work in the Cooperative Research Navies (with a focus on stability and survivability of intact and damaged ships), research has been carried out in the areas of wave loads and motion control of high-speed ships, roll and side-shell loads of FPSO’s. The translation of seakeeping in risk and performance lead to a the development of a voyage simulation tool in the SAFETRANS JIP.
Seakeeping expertise
MARIN's seakeeping expertise embodies:
MARIN's seakeeping expertise embodies:
- Physics of seakeeping, motion control, added resistance, extreme behaviour, progressive flooding
- Short and long-term statistics, extreme value statistics
- Knowledge of the seakeeping aspects that drive prudent seamanship and performance
- Relevant aspects of wind-wave climatology
- Statistical and simulation techniques to quantify performance and risk
- Sufficient understanding of seakeeping to play a role in the optimisation of the design of conventional and unconventional ships.
Specific MARIN areas of seakeeping expertise are:
- Comfort of motor yachts, ferries and cruise ships
- Motion control by means of conventional fins, zero-speed fin stabilizers, T-foils, trim tabs and interceptors as well and anti-roll tanks as well as rudder-roll stabilisation
- Added resistance and speed loss
- Parametric roll
- Sloshing
- Safety of open top ships
- Wave loads experienced by conventional mono hulls, multi-hulls and tug-barge systems
- Slamming impacts and modelling the slamming induced whipping response in seakeeping tests
- The behaviour of high-speed monohulls, catamarans, trimarans, SWATH ships, air-cavity and SES ships and foil-assisted ships
- Special heavy load transports
Specific seakeeping tools at use in MARIN are:
- Linear codes
- The strip-theory code SHIPMO (frequency domain, transverse, 2D, wave dispersion)
- The panel code PRECAL (frequency domain, developed in the CRS, zero-speed wave dispersion)
- The panel code FATIMA (time domain, complete description of the effects of forward speed on the boundary conditions on the hull and the free surface)
- The panel code PANSHIP (time domain, complete description of the effects of forward speed on the hull boundary conditions, including lift effects)
- Non-linear codes
- FREDYN (time domain, developed in the CR Navies, covering the effects of weak non-linearities (the Froude-Krilov pressures up to the instantaneous free surface and the manoeuvring reaction forces) and water on deck on stability and progressive flooding
- PRETTI (time domain, developed in the CRS, covering the effects of weak non-linearities on wave loads)
- Operability and risk
- WASCO (statistical method)
- SAFETRANS & GULLIVER (voyage simulations)
ir. Reint P. DallingaSeakeeping Knowledge Coordinator