Resistance and seakeeping

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Customer: GHENOVA

Related services: HULL FORM OPTIMIZATION, SEAKEEPING

Scope of work:

  • Setting up the numerical model for two initial hull forms:

o   Hydroconic hull
o   Faired hull

  • Initial analysis with potential code
  • Running a viscous code simulation in the desired condition
  • Analysis of ship resistance for both configurations
  • Propulsion configuration analysis for both cases (Pulling vs Pushing thrusters)
  • Optimization of the best performing solution:

o   Third hull geometry proposed

  • Seakeeping calculation for the three hulls

o   Natural frequencies detection (RAOs)
o   Movements, velocities and accelerations under same wave spectrum

Results:

This set of calculations helped in the decision between two different concepts of vessel for the same operation.

Loading condition and speed were considered equal for the two initial geometries; both pulling and pushing thrusters were considered for each hull.

Differences over 20% were found between the needed effective power, reaching 32% power savings when comparing best and worst propulsion combination.

A third geometry was performed, including improvements derived from the reduction of shoulders, modified bulbous bow, a finer entry angle… that reduced hull resistance.

Response Amplitude Operators (RAOs) were calculated for each of the three geometries, in order to compare natural frequencies among them.

A Pierson-Moskowitz wave spectrum was simulated in order to compare movements and accelerations.

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