Hydrodynamic aspects of the Air Lifted Vessel (ALV)

1. Hydrodynamic aspects of the Air Lifted Vessel (ALV) Presenter: Nan Xie Supervisor: Prof. Dracos Vassalos SSRC, NA-ME

2. 1 The Project - EFFISES • 5th Framework Program of EU • 13 partners from 9 EU-countries • Super high speed marine transportation • Objectives: • Passenger ship: E40, 70kn • Cargo ship: E125,50kn • Efficient – less power, 25% • Environment friendly – less emission & wash • Safe

4. SSRC’s task • Development of methods & tools • Wash Wave • Stability

5. 2 Prediction of Wash Wave of ALV • Features: • Over 80% of vessel weight are supported by air-cushion • Pressure patch distribution over cushion • Linear potential theory • New numerical scheme

6. Results:

8. 3 Stability study • Features: • Air compressibility in cushion • Non-linear equations of motions • Time domain simulation • Impulse response function & memory effects • Case study

9. Results – Free surface elevation

10. Results - Impulse response function

11. Results- Porpoising

12. 4 Outcomes: • Project deliverables • Paper for ISOPE’04 • Paper for PRADS’04

13. 5 Future Works • Wash wake assessment of ALV • Refinement of mathematic model of stability • 6 DOF • Stability in manoeuvring motion • CFD – dynamic force derivates • Design & operational guideline, safety assessment

14. Acknowledgments