Detail publikačního výsledku

Effect of spiral vortices on the stability of vortex structures in the diffusor

POCHYLÝ, F.; FIALOVÁ, S.; ŠTEFAN, D.

Originální název

Effect of spiral vortices on the stability of vortex structures in the diffusor

Anglický název

Effect of spiral vortices on the stability of vortex structures in the diffusor

Druh

Stať ve sborníku v databázi WoS či Scopus

Originální abstrakt

It is known that the cause of the instability of stationary vortex structures are the convective terms of the Navier-Stokes equations. Here, the formation of vortex structures is fundamentally influenced by the vector product of the velocity curl and the velocity vector. Spiral vortices are contingent on the zero value of this product and are one of the causes of the formation of a non-stationary rope in a diffusor. In the paper, equations of spiral vortices are derived and the condition of the vortex stability in a diffusor is determined depending on the existence of spiral vortices. In this sense, new forms of the Navier-Stokes equations are derived. It is possible to analyze the influence of boundary conditions on the stability of vortex structures. The theoretical knowledge is applied to the analysis of the stability of the vortex rope in a diffusor. In addition, a simple method for detecting the onset of the instability of vortex structures is presented.

Anglický abstrakt

It is known that the cause of the instability of stationary vortex structures are the convective terms of the Navier-Stokes equations. Here, the formation of vortex structures is fundamentally influenced by the vector product of the velocity curl and the velocity vector. Spiral vortices are contingent on the zero value of this product and are one of the causes of the formation of a non-stationary rope in a diffusor. In the paper, equations of spiral vortices are derived and the condition of the vortex stability in a diffusor is determined depending on the existence of spiral vortices. In this sense, new forms of the Navier-Stokes equations are derived. It is possible to analyze the influence of boundary conditions on the stability of vortex structures. The theoretical knowledge is applied to the analysis of the stability of the vortex rope in a diffusor. In addition, a simple method for detecting the onset of the instability of vortex structures is presented.

Klíčová slova

spiral vortices, stability, velocity

Klíčová slova v angličtině

spiral vortices, stability, velocity

Autoři

POCHYLÝ, F.; FIALOVÁ, S.; ŠTEFAN, D.

Rok RIV

2019

Vydáno

28.03.2019

Kniha

IOP Conference Series: Earth and Environmental Science

ISSN

1755-1315

Periodikum

IOP Conference Series: Earth and Environmental Science

Svazek

240

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1

Strany do

8

Strany počet

8

URL

https://iopscience.iop.org/article/10.1088/1755-1315/240/2/022052

BibTex

@inproceedings{BUT156442,
  author="František {Pochylý} and Simona {Fialová} and David {Štefan}",
  title="Effect of spiral vortices on the stability of vortex structures in the diffusor",
  booktitle="IOP Conference Series: Earth and Environmental Science",
  year="2019",
  journal="IOP Conference Series: Earth and Environmental Science",
  volume="240",
  pages="1--8",
  doi="10.1088/1755-1315/240/2/022052",
  issn="1755-1315",
  url="https://iopscience.iop.org/article/10.1088/1755-1315/240/2/022052"
}