Flexible Oscillating Duct: An approach to a novel propulsor

Hydrodynamic simulation of biological propulsion systems and application on the design of optimal marine propulsors

“…Assuming given values for 0 0 , , , , , , w B R h V ω ψ the motion of the FEOD is fully determined and equations (III.27),(III.28) and (III.29) can be used for the determination of the time dependent geometry and corresponding grid for the FEOD. In case of chord-wise flexibility the FEOD deforms in a similar manner to that discussed in Politis & Tsarsitalidis (2012).…”

“…In , there was a first attempt to systematically investigate the effect of flapping wing propulsor geometry, on its open water performance using UBEM. By further developing specialized data generation codes, the authors presented further simulations of flapping wings, , of bird flight, Politis & Tsarsitalidis (2010) and of a Flexible Oscillating Duct propulsor, Politis & Tsarsitalidis (2012), .…”

“…In , there was a first attempt to systematically investigate the effect of flapping wing propulsor geometry, on its open water performance using UBEM. By further developing specialized data generation codes, further simulations of flapping wings were presented, Politis & Tsarsitalidis (2014), of bird flight, (Politis and Tsarsitalidis 2010) and of a Flexible Oscillating Duct propulsor, Politis & Tsarsitalidis (2012), , twin wing propulsors At the same time several other teams have been working on the same problem. From the Naval Architect point of view, biomimetic propulsion as a main propulsor or as an energy saving system has been numerically investigated by (Floc'h, Phoemsapthawee et al 2012), (Eloy 2012, La Mantia and Dabnichki 2012, Lauder, Flammang et al 2012, Belibassakis and Politis 2013, Filippas and Belibassakis 2013.…”

“…In chronological order, most of cases were developed in parallel, as in most wing configurations were introduced and some preliminary results of each case were presented and thereafter developed. In Politis & Tsarsitalidis (2010), simulations of bird flight were introduced, the concept propulsor FOD (Flexible Oscillating Duct) was introduced in Politis & Tsarsitalidis (2011) and analysed in detail in Politis & Tsarsitalidis (2012). FOD was further developed into FEOD (Flexible Elliptic Oscillating Duct) in Politis, Ioannou and Tsarsitalidis (2013).…”

“…As it will be discussed in the next part and following previous experience, Politis & Tsarsitalidis (2012), the results are presented in the form of charts for the open water thrust and power loading coefficients (based on swept area) versus pitch angle: (III.5) while the 0 P C θ − charts contain additionally in parametric form the max a angle which is the maximum value of ( ) a t , relation (III.3), over one period. This last information is very useful for the designer in order to avoid maximum angles with a potential danger for separating flow (e.g.…”