Numerical and experimental investigation of tree-dimensional cavitating flow around a straight NACA2412 hydrofoil

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28645413%3A_____%2F16%3AN0000001" target="_blank" >RIV/28645413:_____/16:N0000001 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.oceaneng.2016.07.030" target="_blank" >http://dx.doi.org/10.1016/j.oceaneng.2016.07.030</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.oceaneng.2016.07.030" target="_blank" >10.1016/j.oceaneng.2016.07.030</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Numerical and experimental investigation of tree-dimensional cavitating flow around a straight NACA2412 hydrofoil

Popis výsledku v původním jazyce

This work deals with the experimental and the numerical investigation of unsteady cavitating flow around the straight NACA2412 hydrofoil at the incidence angle of 8 deg and the Reynolds number of 1.56Í106. The hydrofoil with the span/chord ratio of 1.25 corresponds to the experiments carried out in the cavitation tunnel. The numerical simulations play the main part in this study; nevertheless the experimental work is also presented as an important background for validation of the results. A comprehensive CFD analysis has been carried out with three advanced turbulence models including the SAS-SST, LES-WALE and DES models. The main attention is focused on the prediction of interactions between the re-entrant flow and cavitation structures as well as the cavitation excited pressure. The monitored pressure fluctuations during the cavity cycles as well as the intervals between the dominant pressure pulses are discussed in detail. To capture side-wall effects, the whole hydrofoil and tunnel test section have been modelled, without any symmetry or periodic boundary conditions. The numerical simulations show, that the dominant frequencies of the cavity oscillation are best predicted by the SAS-SST turbulence model and the Detached Eddy Simulation. The Large Eddy Simulation has provided the best description of vortical structures in the rear part of the hydrofoil but it underestimates the side-wall effects and overestimates the dominant frequencies of the cavity oscillation.

Název v anglickém jazyce

Numerical and experimental investigation of tree-dimensional cavitating flow around a straight NACA2412 hydrofoil

Popis výsledku anglicky

This work deals with the experimental and the numerical investigation of unsteady cavitating flow around the straight NACA2412 hydrofoil at the incidence angle of 8 deg and the Reynolds number of 1.56Í106. The hydrofoil with the span/chord ratio of 1.25 corresponds to the experiments carried out in the cavitation tunnel. The numerical simulations play the main part in this study; nevertheless the experimental work is also presented as an important background for validation of the results. A comprehensive CFD analysis has been carried out with three advanced turbulence models including the SAS-SST, LES-WALE and DES models. The main attention is focused on the prediction of interactions between the re-entrant flow and cavitation structures as well as the cavitation excited pressure. The monitored pressure fluctuations during the cavity cycles as well as the intervals between the dominant pressure pulses are discussed in detail. To capture side-wall effects, the whole hydrofoil and tunnel test section have been modelled, without any symmetry or periodic boundary conditions. The numerical simulations show, that the dominant frequencies of the cavity oscillation are best predicted by the SAS-SST turbulence model and the Detached Eddy Simulation. The Large Eddy Simulation has provided the best description of vortical structures in the rear part of the hydrofoil but it underestimates the side-wall effects and overestimates the dominant frequencies of the cavity oscillation.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Ocean Engineering

ISSN

00298018

e-ISSN

—

Svazek periodika

neuveden

Číslo periodika v rámci svazku

128

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

6

Strana od-do

357-382

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-84979282918