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Concept design and risk analysis

Goal is to not only design and numerically evaluate new ideas for newbuilt or rebuilt ships but also to perform risk analysis. Target is to ensure that these new concepts are safe to use and that they provide the performance needed. Risk analyses can be made for both seakeeping and maneuvering.

Risk analysis for seakeeping

Wave induced motion control (6DOF)

  • Roll damping with and without fin stabilizers, bilge keels, rudders, skegs and antiroll tanks

Non-linear motions

  • Events driven by GM variation
  • Sudden heel angle increasement

Wave impact loads

  • Green water collapse: slamming, bow loads, safe boats etc.
  • Aft slamming

Added resistance for determination of sea margin and speed loss

  • Impact of the motion control devices
  • Shallow and deep water resistances
  • Effect of wave and wind on ship dynamic position
  • Effect of added resistance on drift and steering
  • Propeller loading
  • Loss of thrust
  • Ventilation by propeller tip suction
  • Relative wave elevation
  • Propeller characteristics
  • Increase of hull resistance

Risk analysis for maneuvering

IMO standard maneuvers

  • Zig-zag tests with different angles
  • Rudder test with different angles
  • Turning circle test
  • Full astern stopping test

Additional maneuvers

  • Spiral test
  • Reverse spiral test
  • Pull-out maneuver
  • Very small zip-zag maneuver
  • Harbor and low speed, crabbing
  • Pole tests with thrusters


Animation of wave height behavior when ship proceeds in shallow and narrow channel. Bank effect contributes to the pressure oscillation between the ship and the bank.


Velocity at the sea surface is illustrated in the animation, when the ship is maneuvering in turning basin in Miami.


Ota yhteyttä

Contact Us

Juha Tanttari

Lead Consulting Engineer, Technology Solutions, CFD

email: juha.tanttari@elomatic.com