TY - JOUR

T1 - Experimental and numerical study of the cavitation surge passive control around a semi-circular leading-edge flat plate

AU - Kadivar, Ebrahim

AU - Timoshevskiy, Mikhail V.

AU - Pervunin, Konstantin S.

AU - Moctar, Ould el

N1 - Publisher Copyright: © 2019, The Japan Society of Naval Architects and Ocean Engineers (JASNAOE). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/12/1

Y1 - 2020/12/1

N2 - In this paper, we performed the numerical and experimental study of unsteady cavitation surge around a semi-circular leading-edge flat plate using a passive flow control method. We mounted a miniature spanwise wedge-type vortex generator on the suction side of the model close to its leading edge. To mitigate the destructive impact of this type of cavitation on the hydrofoil performance, we analyzed the effects of the passive control on the dynamics of cavitation surge. First, we investigated experimentally the unsteady cavitating flow around the semi-circular leading-edge flat plate without passive control using high-speed visualization, acoustic measurements and particle image velocimetry method. Next, we simulated numerically the dynamics of unsteady flow under the cavitation surge conditions with an open source code and validated the numerical results using the experimental data. We used a proper interaction between turbulence and cavitation model to capture a highly unsteady behavior of cavitation surge. Finally, we considered the effects of the passive control device on the mechanism of the cavitation surge instability. Our results revealed that using the passive control method, it is possible to stabilize the attached cavity on the suction side of the flat plate, to hinder the development of the spanwise instability of the attached cavity and to mitigate large-scale cavity structures. Furthermore, high-pressure pulsations in the wake region induced by unsteady cavitation surge were considerably reduced.

AB - In this paper, we performed the numerical and experimental study of unsteady cavitation surge around a semi-circular leading-edge flat plate using a passive flow control method. We mounted a miniature spanwise wedge-type vortex generator on the suction side of the model close to its leading edge. To mitigate the destructive impact of this type of cavitation on the hydrofoil performance, we analyzed the effects of the passive control on the dynamics of cavitation surge. First, we investigated experimentally the unsteady cavitating flow around the semi-circular leading-edge flat plate without passive control using high-speed visualization, acoustic measurements and particle image velocimetry method. Next, we simulated numerically the dynamics of unsteady flow under the cavitation surge conditions with an open source code and validated the numerical results using the experimental data. We used a proper interaction between turbulence and cavitation model to capture a highly unsteady behavior of cavitation surge. Finally, we considered the effects of the passive control device on the mechanism of the cavitation surge instability. Our results revealed that using the passive control method, it is possible to stabilize the attached cavity on the suction side of the flat plate, to hinder the development of the spanwise instability of the attached cavity and to mitigate large-scale cavity structures. Furthermore, high-pressure pulsations in the wake region induced by unsteady cavitation surge were considerably reduced.

KW - Cavitating-bubble generators

KW - Cavitation passive control

KW - Cavitation surge

KW - Multiphase flow

KW - Semi-circular leading-edge flat plate

KW - INSTABILITY

KW - MECHANISM

KW - WALL ROUGHNESS

KW - MODEL

KW - AVERAGED NAVIER-STOKES

KW - SIMULATION

KW - FLOW

KW - HIGH-SPEED VISUALIZATION

KW - DYNAMICS

KW - TURBULENCE

UR - http://www.scopus.com/inward/record.url?scp=85075904451&partnerID=8YFLogxK

U2 - 10.1007/s00773-019-00697-2

DO - 10.1007/s00773-019-00697-2

M3 - Article

AN - SCOPUS:85075904451

VL - 25

SP - 1010

EP - 1023

JO - Journal of Marine Science and Technology (Japan)

JF - Journal of Marine Science and Technology (Japan)

SN - 0948-4280

IS - 4

ER -