Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/235759
Title: NATURAL AND VENTILATED CAVITATING FLOW OVER HIGH-SPEED UNDERWATER VEHICLE
Authors: XU CHANG
ORCID iD:   orcid.org/0000-0002-1490-9616
Keywords: CFD, multiphase flow, cavitation, ventilation, free surface, OpenFOAM
Issue Date: 1-Aug-2022
Citation: XU CHANG (2022-08-01). NATURAL AND VENTILATED CAVITATING FLOW OVER HIGH-SPEED UNDERWATER VEHICLE. ScholarBank@NUS Repository.
Abstract: Cavitation occurs around the underwater vehicle when the vehicle moves fast. We conducted the numerical calculation of natural and ventilated cavitating flow. The mechanism of the free surface and bottom wall effects on the cavity profile and stability are studied. Then we present a new passive flow control method using small protrusions as cavitators. Compared with the case without the cavitator, the supercavitating hydrofoil controlled by the cavitator shows a significant difference in the lift, while the drag changes little. Such a passive flow control method can only be applied when the cavitation number is low. At moderate cavitation number, air ventilation is needed. The ventilated cavitating flow over an axisymmetric projectile is investigated at a wide range of natural cavitation numbers, which is much more stable than the natural cloud cavitating flow. The results show that air ventilation can prevent pressure fluctuations and reduce drag significantly.
URI: https://scholarbank.nus.edu.sg/handle/10635/235759
Appears in Collections:Ph.D Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
XuC.pdf8.32 MBAdobe PDF

OPEN

NoneView/Download

Page view(s)

10
checked on Jan 26, 2023

Download(s)

4
checked on Jan 26, 2023

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.