15th European Conference on Turbomachinery Fluid dynamics & Thermodynamics
Paper ID:
ETC2023-330
Main Topic:
Hydraulics Machine
Authors
Abstract
Cavitation is an unavoidable and tricky problem in marine propellers and propulsion, receiving considerable attention due to its severe destructive effects, such as performance loss, vibration, noise, etc. Thereinto, cloud cavitation is generally considered the highly unsteady turbulent flow, characterized by the large-scale cavity shedding and strong intensity erosion of bubble collapse. Getting inspiration from nature has been a common way to solve some modern tricky engineering problems. In the field of fluid mechanics, a passive flow control technique inspired by the humpback whale flippers has witnessed a lot of new research areas and applications. More recently, some experimental work has been done to reveal the action mechanism of these tubercles to see if they can be implemented in marine engineering devices. Therefore, this work will adopt the Computational Fluid Dynamics (CFD) methodology to investigate the effects of leading-edge protuberances on controlling the cloud cavitating flow around the NACA 0015 hydrofoil, aiming to determine the underlying physical mechanisms and evaluate its potential promotion and application relevance. Within the URANS framework, the cavitation is treated as the homogeneous flow solved by the density-corrected Shear Stress Transport (SST) $k-omega$ turbulence model and the Zwart-Gerber-Belamri cavitation model.