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RUDOLF, P. KOZÁK, J.
Originální název
Computational modelling of cavitation in simple geometries, but complex flows
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
angličtina
Originální abstrakt
Cavitation occurs when local pressure in flowing liquid drops below saturated vapor pressure. If the resulting vapor bubbles are transported to regions of higher pressure then sudden condensation follows, which is accompanied by emission of pressure and acoustic waves. Above described process leads to cavitation erosion and consequently to shorter service time of the hydraulic machines. Cavitation can be modeled by current CFD tools with simplified cavitation models. Computational simulations revealed that proper capturing of the underlying one-phase flow field is crucial to obtain correct vorticity distribution. Clouds filled with vapor are born from regions of concentrated vorticity and shed downstream. Only advanced turbulence models (Reynolds Stress Model, Scale Adaptive Simulation) are able to predict vorticity field and development of the unsteady swirling flow. Increased vorticity generation in two-phase flows is caused by additional term in vorticity equation - baroclinic torque. Present paper dicusses relative magnitude of vorticity generation terms for cases of concentrated vortical structure and separated boundary layer over hydrofoil.
Klíčová slova
cavitation, vorticity, baroclinic torque
Autoři
RUDOLF, P.; KOZÁK, J.
Rok RIV
2014
Vydáno
3. 11. 2014
Nakladatel
FAV ZČU Plzeň
Místo
Plzeň
ISBN
978-80-261-0429-2
Kniha
Computational mechanics 2014; book of extended abstracts
Strany od
1
Strany do
2
Strany počet
BibTex
@inproceedings{BUT111327, author="Pavel {Rudolf} and Jiří {Kozák}", title="Computational modelling of cavitation in simple geometries, but complex flows", booktitle="Computational mechanics 2014; book of extended abstracts", year="2014", pages="1--2", publisher="FAV ZČU Plzeň", address="Plzeň", isbn="978-80-261-0429-2" }