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Statements

Subject Item
n2:RIV%2F00216305%3A26210%2F01%3APU24185%21RIV11-MSM-26210___
rdf:type
skos:Concept n16:Vysledek
dcterms:description
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. 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.
dcterms:title
Unsteady Flow in the Draft Tube with Elbow Part B - Numerical Investigation Unsteady Flow in the Draft Tube with Elbow Part B - Numerical Investigation
skos:prefLabel
Unsteady Flow in the Draft Tube with Elbow Part B - Numerical Investigation Unsteady Flow in the Draft Tube with Elbow Part B - Numerical Investigation
skos:notation
RIV/00216305:26210/01:PU24185!RIV11-MSM-26210___
n3:aktivita
n10:V n10:Z n10:N
n3:aktivity
N, V, Z(MSM 262100001)
n3:dodaniDat
n7:2011
n3:domaciTvurceVysledku
n20:8024197
n3:druhVysledku
n19:D
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
699624
n3:idVysledku
RIV/00216305:26210/01:PU24185
n3:jazykVysledku
n17:eng
n3:klicovaSlova
draft tube, unsteady, vortex, turbulence modeling, helicity
n3:klicoveSlovo
n6:draft%20tube n6:vortex n6:turbulence%20modeling n6:unsteady n6:helicity
n3:kontrolniKodProRIV
[115871945B24]
n3:mistoKonaniAkce
Trondheim
n3:mistoVydani
Trondheim
n3:nazevZdroje
Proceedings of IAHR Workgroup Meeting
n3:obor
n14:BK
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
1
n3:rokUplatneniVysledku
n7:2001
n3:tvurceVysledku
Rudolf, Pavel
n3:typAkce
n9:WRD
n3:zahajeniAkce
2001-06-26+02:00
n3:zamer
n4:MSM%20262100001
s:numberOfPages
155
n18:hasPublisher
NTNU Trondheim
n12:organizacniJednotka
26210