Session: 06-15-01 Unsteady Hydrodynamics, Vibrations, Acoustics and Propulsion

Paper Number: 78811

78811 - A Dynamical System for the Combined Performance of Innovative Biomimetic Thruster With Standard Propulsion System in Waves 

Dynamic wings located at the bow of the ship are investigated for wave energy extraction from ship motions, augmenting ship propulsion in waves and improving dynamic stability in waves. In the context of Seatech H2020 project (https://seatech2020.eu/) flapping-foil thrusters and Dual Fuel engine technologies are combined to provide a renewable-energy-based hybrid solution for the reduction of fuel consumption and operational cost. At first stage of analysis a simplified approximation is developed exploiting data from systematic series for modelling ship propulsion in waves including ship motions and foil loads [1]. In the present work a novel dynamical system is developed and applied to the combined performance of innovative biomimetic thruster in waves. The proposed method exploits seakeeping analysis and unsteady foil theory for the estimation of the ship-foil dynamic system coefficients and loads. The ship steadily advances in the presence of waves that are modelled by parametric spectra corresponding to specific sea states. Then appropriate time integration techniques are used for the estimation of evolution of the system responses and foil loads; see, e.g., [2]. The ship response amplitude operators and the dynamic foil loads are compared for validation and calibration purposes against experimental data and BEM and CFD calculations presented in previous works [3,4].

To examine the feasibility of the proposed propulsion innovation in short-sea shipping industry the case of a Bulk Carrier of small size is examined. Numerical results indicate that significant ship performance can be obtained under realistic operating conditions. Thus, the present method can serve as a useful tool for assessment and the preliminary design of such systems extracting energy from sea waves for the augmentation of ship propulsion.

 

References

1.Belibassakis, K., Bleuanus, S., Vermeiden, J., Townsend, N. (2021) Combined performance of innovative biomimetic ship propulsion system in waves with Dual Fuel ship engine and application to short-sea shipping. 31st International Ocean and Polar Conference (ISOPE2021), June 20-25, Rhodes, Greece.

2.Fossen T. (2011) Handbook of Marine Craft Hydrodynamics and Motion Control, Wiley.

3.Filippas, E.S., Papadakis, G.P., Belibassakis, K.A. (2020) Free-surface effects on the performance of flapping-foil thruster for augmenting ship propulsion in waves.  Journal of Marine Science and Engineering, 8, 357.

4.Belibassakis, K.A., Filippas, E.S., Papadakis, G.P., (2021) Performance of dynamic wing for augmenting sip propulsion in head and quartering seas by GPU-BEM  (in preparation).

Presenting Author: Kostas Belibassakis National Technical University of Athens

Authors:

Kostas Belibassakis National Technical University of Athens
Evangelos Filippas National Technical University of Athens (NTUA)