Detail publikace

Computational modelling of cavitation in simple geometries, but complex flows

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

2

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"
}