Detail publikace

POD analysis of a vortex rope with transient boundary conditions

URBAN, O. RUDOLF, P.

Anglický název

POD analysis of a vortex rope with transient boundary conditions

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

en

Originální abstrakt

The paper presents the results of a POD analysis of the flow in a swirl generator. The generator has two separate inlets – one straight axial inlet and one tangential inlet ended by a spiral case. This allows to set different operating points, which are in turn connected with different shapes of the vortex rope present in the flow field. In this case, the investigation is aimed at linearly varying flow rates at the boundaries, namely, the ratio of the tangential flow rate is increased from 40 % up to more than 80 % of the total flow rate, which is maintained constant. Substituting the POD modes into the energy equation provides additional insight into the energy fluxes between the modes and consequently into a major part of the turbulent flow energy cascade as the input data were gained from a CFD simulation using scale-resolving Stress-Blended Eddy Simulation model. The POD modes can be used to construct a simplified model of the vortex rope dynamics covering a wider operating range rather than just one point.

Anglický abstrakt

The paper presents the results of a POD analysis of the flow in a swirl generator. The generator has two separate inlets – one straight axial inlet and one tangential inlet ended by a spiral case. This allows to set different operating points, which are in turn connected with different shapes of the vortex rope present in the flow field. In this case, the investigation is aimed at linearly varying flow rates at the boundaries, namely, the ratio of the tangential flow rate is increased from 40 % up to more than 80 % of the total flow rate, which is maintained constant. Substituting the POD modes into the energy equation provides additional insight into the energy fluxes between the modes and consequently into a major part of the turbulent flow energy cascade as the input data were gained from a CFD simulation using scale-resolving Stress-Blended Eddy Simulation model. The POD modes can be used to construct a simplified model of the vortex rope dynamics covering a wider operating range rather than just one point.

Klíčová slova anglicky

Proper Orthogonal Decomposition, Vortex rope, Swirl generator

Vydáno

21.12.2019

ISSN

1755-1315

Kniha

IOP Conference Series: Earth and Environmental Science

Ročník

405

Číslo

(2019) 012034

Strany od–do

1–6

Počet stran

6

BIBTEX


@inproceedings{BUT161112,
  author="Edita {Mariánková} and Ondřej {Urban} and Pavel {Rudolf},
  title="POD analysis of a vortex rope with transient boundary conditions",
  booktitle="IOP Conference Series: Earth and Environmental Science",
  year="2019",
  volume="405",
  number="(2019) 012034",
  month="December",
  pages="1--6",
  issn="1755-1315"
}