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Statements

Subject Item
n2:RIV%2F00216305%3A26210%2F14%3APU111794%21RIV15-MSM-26210___
rdf:type
skos:Concept n16:Vysledek
dcterms:description
Swirling flow with compact coherent structures is very good candidate for proper orthogonal decomposition (POD), i.e. for decomposition into eigenmodes, which are the cornerstones of the flow field. Present paper focuses on POD of steady flows, which correspond to different operating points of Francis turbine draft tube flow. Set of eigenmodes is built using a limited number of snapshots from computational simulations. Resulting reduced order model (ROM) describes whole operating range of the draft tube. ROM enables to interpolate in between the operating points exploiting the knowledge about significance of particular eigenmodes and thus reconstruct the velocity field in any operating point within the given range. Practical example, which employs axisymmetric simulations of the draft tube flow, illustrates accuracy of ROM in regions without vortex breakdown together with need for higher resolution of the snapshot database close to location of sudden flow changes (e.g. vortex breakdown). ROM based on Swirling flow with compact coherent structures is very good candidate for proper orthogonal decomposition (POD), i.e. for decomposition into eigenmodes, which are the cornerstones of the flow field. Present paper focuses on POD of steady flows, which correspond to different operating points of Francis turbine draft tube flow. Set of eigenmodes is built using a limited number of snapshots from computational simulations. Resulting reduced order model (ROM) describes whole operating range of the draft tube. ROM enables to interpolate in between the operating points exploiting the knowledge about significance of particular eigenmodes and thus reconstruct the velocity field in any operating point within the given range. Practical example, which employs axisymmetric simulations of the draft tube flow, illustrates accuracy of ROM in regions without vortex breakdown together with need for higher resolution of the snapshot database close to location of sudden flow changes (e.g. vortex breakdown). ROM based on
dcterms:title
Reduced order model of draft tube flow Reduced order model of draft tube flow
skos:prefLabel
Reduced order model of draft tube flow Reduced order model of draft tube flow
skos:notation
RIV/00216305:26210/14:PU111794!RIV15-MSM-26210___
n3:aktivita
n11:P
n3:aktivity
P(GA13-23550S), P(LO1202)
n3:cisloPeriodika
1
n3:dodaniDat
n6:2015
n3:domaciTvurceVysledku
n5:5409594 n5:8024197
n3:druhVysledku
n12:J
n3:duvernostUdaju
n4:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
41700
n3:idVysledku
RIV/00216305:26210/14:PU111794
n3:jazykVysledku
n14:eng
n3:klicovaSlova
draft tube, proper orthogonal decomposition, POD, reduced order model, vortex rope
n3:klicoveSlovo
n8:vortex%20rope n8:proper%20orthogonal%20decomposition n8:reduced%20order%20model n8:draft%20tube n8:POD
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[71125A533083]
n3:nazevZdroje
IOP Conference Series: Earth and Environmental Science
n3:obor
n19:JE
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n10:GA13-23550S n10:LO1202
n3:rokUplatneniVysledku
n6:2014
n3:svazekPeriodika
22
n3:tvurceVysledku
Rudolf, Pavel Štefan, David
s:issn
1755-1315
s:numberOfPages
10
n7:doi
10.1088/1755-1315/22/2/022022
n17:organizacniJednotka
26210