Journal of Marine Science and Engineering, Volume 8, Issue 4
April 2020 - 70 articles
Cover Story: Ducted propellers are an unconventional propulsion system usually adopted for ship propulsion. Their functioning has been addressed using medium fidelity (i.e., BEM) approaches with promising results. Despite providing good predictions of forces and moments, these methods are not able to provide accurate insights into the flow peculiarities of such complex systems. On the other hand, modern high-fidelity CFD codes like RANSE could provide a better description of these features. Toward this aim, forces and the wake field around two ducted propellers (one of accelerating and one of decelerating type) are analyzed using RANSE calculations combined with an adaptive mesh refinement process. These predictions are compared to experimental results, including the usual thrust and torque curves as well as LDV measurements to demonstrate the reliability of this method, which is particularly useful for lesser-studied decelerating ducts.
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