Grigorios Hatzissawidis

Cloud cavitation dynamics with varying incidence


voorkant	achterkant

ISBN:

978-3-8191-0747-4

Reeks:

Forschungsberichte zur Fluidsystemtechnik
Uitgever: Prof. Dr.-Ing. Peter F. Pelz
Darmstadt

Volume:

Trefwoorden:

Cavitation; multiphase flow; shockwaves; coherent structures; data-driven modal decomposition

Soort publicatie:

Dissertatie

Taal:

Engels

Pagina's:

196 pagina's

Gewicht:

266 g

Formaat:

21 x 14,8 cm

Bindung:

Softcover

Prijs:

58,80 € / 73,60 SFr

Verschijningsdatum:

Juni 2026

Kopen:

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Samenvatting

This doctoral thesis investigates the complex dynamics of cloud cavitation about a NACA 0015 hydrofoil as the incidence is varied. Varying the incidence reveals a range of cloud cavitation phenomena and underlying mechanisms. The main drivers of cloud cavitation are re-entrant flow and condensation shockwaves, which also interact in a complex manner. This study contributes to the understanding of cloud cavitation in pumps, ship propellers and heart valves, where cavitation remains a limiting factor in the operation of fluid systems. The experiments were conducted in the closed, recirculating, variable-pressure water tunnel at the Cavitation Research Laboratory, University of Tasmania, using synchronised high-speed photography and a six-component force balance. Modal decomposition methods, including spectral proper orthogonal decomposition (SPOD), were applied to the high-speed photographs to identify coherent structures. Transient behaviour was analysed using wavelet transform, revealing different shedding modes occurring simultaneously and/or intermittently, which were then examined in detail using space-time diagrams. This thesis provides a basis for the understanding and controlling of cloud cavitation as it occurs in technical systems.