Numerical evaluation on the effect of boss cap geometries on AUV propeller noise.

• Ano de defesa: 2021
• Autor(a) principal: Silva, Rubens Cavalcante da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Biblioteca Digitais de Teses e Dissertações da USP
• Palavras-chave em Português: AUV; Boss cap; Bosso; Computational fluid dynamics; DES; Dinâmica dos fluidos computacional; Ffowcs Williams and Hawkings acoustic model; Hidroacústica; Hydroacoustics; Modelo acústico de Ffowcs Williams-Hawkings; Propeller; Propulsão
• Link de acesso: https://www.teses.usp.br/teses/disponiveis/3/3135/tde-03022022-143042/

This study numerically analyzed the underwater noise emitted from an autonomous underwater vehicle (AUV) high-skewed propeller (Mod5), considering five different boss cap geometries (elliptical and divergent) and using a commercial CFD code. The numerical model was developed by means of the Ffowcs Williams-Hawkings (FW-H) acoustic model, as well as the Dunn-Farassat-Padula formulation to subsonic rotating blades, coupled with a Detached Eddy Simulation (DES) turbulence model. The model was validated by comparing the numerical results with acoustics data from INSEAN E779A propeller. Numerical and experimental results showed that divergent boss caps presented lower values of propeller efficiency than the elliptical geometry. On the other hand, the most divergent geometry presented a slightly reducing of noise to certain frequency bands.