Two novel marine thruster concepts based on the Coanda effect

Abstract

The present work addresses the conceptual development as well as the numeric simulation of two unconventional marine thrusters that employ the Coanda effect. The first concept uses this effect to obtain the phenomenon of flow amplification, being a water-jet thruster that eliminates the need for an impeller. The second one uses the Coanda effect to direct the discharged jet of water, being able to eliminate the need for a rudder. The aim is to verify the occurrence of the Coanda effect for devices using water as working fluid and analyse the suitability of the concepts. To achieve that, first, a review of the state-of-the-art on the employment of the Coanda effect toward propulsion is carried out. The numeric model consists of the solution of the time-averaged conservation equations of mass and momentum and the turbulence closure equations by the finite volume method. Results have shown close correspondence with previous predictions from the literature. Both thruster concepts have shown to be promising for the application in manoeuvrability and propulsion marine systems, although deeper studies are still required.

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Acknowledgements

The author R. L. Lemos thanks CNPq for the scholarship. The author Y. B. El Halal thanks FAPERGS for the Scientific Initiation Scholarship. The author C. H. Marques thanks FAPERGS for the financial support for the research project ARD (process: 19/2551-0001250-0). The author E. D. dos Santos is grateful to CNPq for the research productivity grants (Process: 306024/2017-9).

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Correspondence to C. H. Marques.

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Lemos, R.L., Marques, C.H., El Halal, Y.B. et al. Two novel marine thruster concepts based on the Coanda effect. Mar Syst Ocean Technol (2021). https://doi.org/10.1007/s40868-021-00092-w

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Keywords

  • Manoeuvrability
  • Propulsion
  • HOMER nozzle
  • PMEC
  • CFD
  • Coanda effect