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ADAM4EVE workshop on Adaptive Ship Hull Forms

Learn about adaptive stern geometry for ship hull forms, including evaluation methods, results, and benefits for fuel savings and performance enhancement. Discover the structural challenges and potential for future development.

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ADAM4EVE workshop on Adaptive Ship Hull Forms

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  1. ADAM4EVE workshop on Adaptive Ship Hull Forms Adaptive Stern Geometry Thomas Stoye, Knut Frömming Flensburger Schiffbau-Gesellschaft June 4th, 2015 VTT Technical Research Centre of Finland, Espoo

  2. Table of Contents • Motivation & Objectives • Evaluation Methods • Evaluation Results • Demonstrator • Statement from class societies • Conclusion Source: CALMAC

  3. Motivation Design to specific design-point Operational profile consist of many points Adjustment of hull-form to actual operation point Stern part promising Adaptation physically feasible Source: FSG

  4. Objectives • Stern wedge change possible • Large impact on resistance • Identification of movable part • Variation of length and angle within boundaries • Change hydrodynamic body • Movable duck-tail Source: FSG

  5. Evaluation Methods • CFD-study to determine parameters of variable part • Viscous flow methods for resistance evaluation • Selection of promising parameters • Design of steel structure and piping-system • Structural evaluation by class-rules and FE-Calculations • Further evaluation of performance by model tests • Resistance, open-water propeller and self-propulsion tests

  6. Evaluation Results - CFD • Variation of length and angle within boundaries • Movable duck-tail with fixed angle selected • Resistance reduction of up to 3% for some operational points • Longer flap for larger speed • Shorter flap for slower speed

  7. Evaluation Results – Model Tests Source: ADAM4EVE-WP10 - VTT • Verification of CFD-Results for resistance by model tests • Additionally open-water propeller and self-propulsion tests • Savings for large draft and high speed up to 7% of PD • Fuel Savings for machinery arrangement and given operational profile ~3-3.5% per year • Larger Benefit when implemented in new design Source: ADAM4EVE-WP06 - FSG

  8. Model tests A new modular ship model, scale 1:16.697, was built for model tests Model propellers from FSG were used. The model scale resistance and propulsion tests were performed for the RoPax ship model with an adaptable stern geometry.

  9. Model test program Speed points: The model test speeds: 13, 14, 15, 16, 17, 18.5, 19.5 and 20.5 knots in full scale, (1.637 – 2.581 m/s in model scale). In the CFD computations the selected speed points were 14 and 19.5 knots. Measured quantities: Open water tests of the propellers. Resistance test: towing force, sinkage fore and aft. Propulsion test: towing force, number of revolutions, thrust and torque of the propellers, sinkage fore and aft. The analysis to the full scale was made using ITTC-78 method. Test program for the resistance and propulsion tests

  10. Resistance tests results T=4.8m

  11. Propulsion test results T=4.8m

  12. Resistance tests results T=4.2m

  13. Propulsion test results T=4.2m

  14. Evaluation Results – Structure • Steel structure designed in 3D • Class-Rules as basis for design • Slamming loads determined by CFD • FE-model used for direct calculations • Critical areas identified – No show-stoppers • Steel structure to be improved in next stage

  15. Demonstrator • Visualization of principle • Steel structure with actuator • Simplified 1:5 model • Production ongoing Source: ADAM4EVE-WP06

  16. Demonstrator • Installation of pneumatic actuators • Functional test • Identification of robust pneumatic system

  17. Class Societies Evaluation • No major HAZIDS identified • All risks are of controllable extend • Details of fixation, dimensioning of piping-system to be looked • Control-system and maintenance to be designed more detailed • Evaluation for each individual application to be examined Source: ADAM4EVE-WP06 FSG

  18. Conclusion Performance of idea very promising Implementation feasible and realistic Results certain due to model-tests Structural challenges can be solved No major HAZIDS identified To be developed and evaluated for each individual ship

  19. Source: VTT Thank you for your attention! The Project is funded in the Seventh Framework Program of the European Union - Contract No.: SCP2-GA-2012-314206

  20. The Project is funded in the Seventh Framework Programme of the European Union • Contract No.: SCP2-GA-2012-314206

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