Detail publikačního výsledku

Unsteady Flow in the Draft Tube with Elbow Part B - Numerical Investigation

RUDOLF, P.

Originální název

Unsteady Flow in the Draft Tube with Elbow Part B - Numerical Investigation

Anglický název

Unsteady Flow in the Draft Tube with Elbow Part B - Numerical Investigation

Druh

Stať ve sborníku v databázi WoS či Scopus

Originální abstrakt

The unsteady numerical simulation of the flow in the draft tube was performed in order to find out a suitable flow model being able to predict the precessing vortex core. The CFD code FLUENT was used for this flow analysis. The investigated computational domain corresponds to the Francis turbine draft tube for a runner less operation. The radial and tangential velocities on the radial inlet are simulating the free vortex. The domain is extended to the large tank in order to avoid ill-possed outlet boundary condition. The results have confirmed that RSM turbulence model can predict the origin and behavior of the precessing vortex core in the draft tube. The vortex motion and the precessing frequency can be analyzed. The results of the numerical simulation correspond to the conclusions based on the experimental observation. Finally different definitions for vortex identification are discussed.

Anglický abstrakt

The unsteady numerical simulation of the flow in the draft tube was performed in order to find out a suitable flow model being able to predict the precessing vortex core. The CFD code FLUENT was used for this flow analysis. The investigated computational domain corresponds to the Francis turbine draft tube for a runner less operation. The radial and tangential velocities on the radial inlet are simulating the free vortex. The domain is extended to the large tank in order to avoid ill-possed outlet boundary condition. The results have confirmed that RSM turbulence model can predict the origin and behavior of the precessing vortex core in the draft tube. The vortex motion and the precessing frequency can be analyzed. The results of the numerical simulation correspond to the conclusions based on the experimental observation. Finally different definitions for vortex identification are discussed.

Klíčová slova v angličtině

draft tube, unsteady, vortex, turbulence modeling, helicity

Autoři

RUDOLF, P.

Rok RIV

2011

Vydáno

26.06.2001

Nakladatel

NTNU Trondheim

Místo

Trondheim

Kniha

Proceedings of IAHR Workgroup Meeting

Strany od

52

Strany počet

155

Plný text v Digitální knihovně

http://hdl.handle.net/

BibTex

@inproceedings{BUT3496,
  author="Pavel {Rudolf}",
  title="Unsteady Flow in the Draft Tube with Elbow Part B - Numerical Investigation",
  booktitle="Proceedings of IAHR Workgroup Meeting",
  year="2001",
  pages="155",
  publisher="NTNU Trondheim",
  address="Trondheim"
}