Current loads
General information
One of the important mean environmental loads on offshore structures are the current loads, especially in regions with strong currents, such as the Gulf of Mexico. In high current velocities the current loads on the floater can be significant. Many floaters (such as FPSOs) only experience the surface current velocity, but for deep draft floaters (such as spars) the vertical current velocity profile also needs to be considered.

Services & Activities
The Offshore Department has a lot of expertise in the field of current loads on FPSOs, Semi-submersibles and Spars. Current loads can be measured in one of MARIN's basins, either by generating current in the basin or by towing the structure. Alternatively, the current loads can be determined by means of wind tunnel tests, carried out at the facilities of one of our regular sub-contractors. Possibilities for the calculation of current loads include the use of data base current load coefficients (using measurement results for similar vessels), semi-empirical methods (building block approach, e.g. WINDOS) and CFD calculations with e.g. our in-house viscous-flow code ReFRESCO.

Issues related to current loads include low frequency damping of floaters and Vortex Induced Motions (VIM).

The Trials & Monitoring Department can be involved in full-scale measurements and assessment of current loads.

Facilities & Tools
Current load measurements are carried out in the following MARIN facilities :

The following tools are used to study current loads :

Software Sales
Some software tools are available for commercial use outside MARIN. A complete overview of these software tools for sale can be found under Software Sales.

Experience
The list below gives a review of current loads projects carried out at MARIN:

  • LNG-carrier current load measurements (HAWAII JIP, 2006)
  • Shenzi TLP (BHP Billiton / MODEC, 2005)
  • Bonga FPSO (Shell/Samsung, 2000)
  • Ocean Confidence DP model tests (Diamond Offshore, 1998)
  • HAWAI JIP
  • Current Affairs JIP
Most recent current load papers presented by MARIN
(complete overview of papers can be found under Publications)

Optimisation of Resistance and Towed Stability of an Offshore Going Barge With CFD
Toxopeus, S.L., Stroo, K. and Muller, B., OMAE ASME 32nd International Conference on Ocean, Offshore and Arctic Engineering, Nantes, France, 2013

Investigation of water depth and basin wall effects on KVLCC2 in manoeuvring motion using viscous-flow calculations
Toxopeus, S.L., Simonsen, C.D., Guilmineau, E., Visonneau, M., Xing, T. and Stern, F., Journal of Marine Science and Technology, 2013

Viscous-Flow Calculations For KVLCC2 In Deep And Shallow Water
Toxopeus, S.L., MARINE 2011, IV International Conference on Computational Methods in Marine Engineering (Selected Papers), Computational Methods in Applied Sciences, 2013

Viscous-Flow Calculations for Model and Full-Scale Current Loads on Typical Offshore Structures
Koop, A., Klaij, C., Vaz, G., MARINE 2011, IV International Conference on Computational Methods in Marine Engineering (Selected Papers), Computational Methods in Applied Sciences, 2013

URANS Calculations For Smooth Circular Cylinder Flow In A Wide Range Of Reynolds Numbers: Solution Verification And Validation
Rosetti, G.F., Vaz, G. and Fujarra, A.L.C., Journal of Fluids Engineering, 2012

Collaborative CFD Exercise for a Submarine in a Steady Turn
Toxopeus, S.L., Atsavapranee, P., Wolf, E., Daum, S., Pattenden, R., Widjaja, R., Zhang, J.T. and Gerber, A.G., OMAE ASME 31st International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil, 2012

Workshop On Verification And Validation Of CFD For Offshore Flows
Eça, L. and Vaz, G., OMAE ASME 31st International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil, 2012

Predicting Wind Loads On Typical Offshore Vessels Using CFD
Koop, A., Rossin, B. and Vaz, G., OMAE ASME 31st International Conference on Ocean, Offshore and Arctic Engineering, Rio de Janeiro, Brazil, 2012

Most recent current load articles written for MARIN Report
(complete overview of articles can be found under Publications)

MARIN set to open its new Depressurised Wave Basin
MARIN Report, 2011

Full-scale squat measurements
Thijs Hasselaar, MARIN Report, 2011

Increasing interest in tests for Vortex Induced Motions
Arjen Koop & Jule Scharnke, MARIN Report, 2011

Pioneering purpose-built wind turbine installation vessels under test
Willemijn Pauw & Arjen Koop, MARIN Report, 2010

CFD for offshore applications
Arjan Koop & Guilherme Vaz, MARIN report, 2010

Contact
For more information on how MARIN can help your organisation with current loads, please contact :

For model test and simulation activities: Offshore Department
knowledge group manoeuvring at manoeuvring@marin.nl
knowledge group Resistance and Propulsion at powering@marin.nl
For full-scale measurements: Trials & Monitoring Department

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