Publication detail
Decomposition of the Swirling Flow Fields
RUDOLF, P. JÍZDNÝ, M.
Czech title
Dekompozice zavířeného proudového pole
English title
Decomposition of the Swirling Flow Fields
Type
conference paper
Language
en
Original abstract
Paper presents application of the proper orthogonal decomposition method (POD) on the swirling flows. POD enables to extract the most energetic eigenmodes of pressure and velocity fields. CFD data from unsteady simulations serve as the input for POD. Presented methodology enables to study both spatial and temporal behavior of the eigenmodes, which is documented on an example of swirling flow in a draft tube. A new view of the swirling flow dynamics, complementary to current approaches, is obtained. Proper orthogonal decomposition identifies and ranks the modes according to their energy, therefore a simplified low dimensional model can be constructed and further analyzed.
Czech abstract
Článek prezentuje aplikaci vlastní ortogonální dekompozice (POD) na vírové proudění. POD umožňuje identifikovat vlastní tvary proudového pole, které mají nejvíce energie z dat získaných nestacionární CFD simulací. POD umožňuje studovat časově prostorové chování vlastních tvarů proudového pole, což je dokumentováno na případě vírového copu v sací troubě vodní turbíny. Identifikace nejdůležitějších vlastních tvarů poskytuje možnot k sestavení jednoduššího modelu proudění výrazně nižšího řádu.
English abstract
Paper presents application of the proper orthogonal decomposition method (POD) on the swirling flows. POD enables to extract the most energetic eigenmodes of pressure and velocity fields. CFD data from unsteady simulations serve as the input for POD. Presented methodology enables to study both spatial and temporal behavior of the eigenmodes, which is documented on an example of swirling flow in a draft tube. A new view of the swirling flow dynamics, complementary to current approaches, is obtained. Proper orthogonal decomposition identifies and ranks the modes according to their energy, therefore a simplified low dimensional model can be constructed and further analyzed.
Keywords in Czech
vírové proudění, dekompozice, vlastní tvar, sací trouba, vírový cop
Keywords in English
swirling flow, decomposition, eigenmode, draft tube, vortex rope
RIV year
2011
Released
26.10.2011
Publisher
Faculty of Mechanical Engineering University of Belgrade
Location
Belgrade
ISBN
978-86-7083-740-9
Book
Proceedings of the 4-th IAHR International Meeting on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems
Edition number
1
Pages from–to
131–141
Pages count
9
BIBTEX
@inproceedings{BUT75144,
author="Pavel {Rudolf} and Martin {Jízdný},
title="Decomposition of the Swirling Flow Fields",
booktitle="Proceedings of the 4-th IAHR International Meeting on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems",
year="2011",
month="October",
pages="131--141",
publisher="Faculty of Mechanical Engineering University of Belgrade",
address="Belgrade",
isbn="978-86-7083-740-9"
}