Spanwise characteristics of the separated flow in a suddenly expanding duct

M. V. Ötügen, G. Papadopoulos, George Vradis, G. Muckenthaler

Research output: Contribution to journalArticle

Abstract

The secondary flow due to the growth of the streamwise vortices near the side walls serves to diminish the spanwise uniformity of the time-mean flow properties. In the region adjacent to the side walls, momentum mixing is enhanced due to the existence of the secondary flow and the separated shear layer spreads faster. There is a corresponding increase in the non-coherent turbulence in this region near the side walls. The increased spreading rates and overall turbulence in the shear layer, in turn, tend to suppress the rolling-up of the separated shear layer into organized structures. This effect is rapidly carried into the core two-dimensional flow region as the streamwise vortex grows under the influence of the adverse pressure gradient. The surface visualizations provide further evidence of the existence of secondary flows near the side walls.

Original languageEnglish (US)
Pages (from-to)213-216
Number of pages4
JournalExperiments in Fluids
Volume14
Issue number3
StatePublished - Jan 1993

Fingerprint

separated flow
Secondary flow
ducts
Ducts
secondary flow
shear layers
Vortex flow
Turbulence
turbulence
vortices
Pressure gradient
two dimensional flow
Momentum
Visualization
pressure gradients
momentum

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes
  • Computational Mechanics
  • Mechanics of Materials

Cite this

Ötügen, M. V., Papadopoulos, G., Vradis, G., & Muckenthaler, G. (1993). Spanwise characteristics of the separated flow in a suddenly expanding duct. Experiments in Fluids, 14(3), 213-216.

Spanwise characteristics of the separated flow in a suddenly expanding duct. / Ötügen, M. V.; Papadopoulos, G.; Vradis, George; Muckenthaler, G.

In: Experiments in Fluids, Vol. 14, No. 3, 01.1993, p. 213-216.

Research output: Contribution to journalArticle

Ötügen, MV, Papadopoulos, G, Vradis, G & Muckenthaler, G 1993, 'Spanwise characteristics of the separated flow in a suddenly expanding duct', Experiments in Fluids, vol. 14, no. 3, pp. 213-216.
Ötügen MV, Papadopoulos G, Vradis G, Muckenthaler G. Spanwise characteristics of the separated flow in a suddenly expanding duct. Experiments in Fluids. 1993 Jan;14(3):213-216.
Ötügen, M. V. ; Papadopoulos, G. ; Vradis, George ; Muckenthaler, G. / Spanwise characteristics of the separated flow in a suddenly expanding duct. In: Experiments in Fluids. 1993 ; Vol. 14, No. 3. pp. 213-216.
@article{d034dc7822ac480b9bf064b29a483b9c,
title = "Spanwise characteristics of the separated flow in a suddenly expanding duct",
abstract = "The secondary flow due to the growth of the streamwise vortices near the side walls serves to diminish the spanwise uniformity of the time-mean flow properties. In the region adjacent to the side walls, momentum mixing is enhanced due to the existence of the secondary flow and the separated shear layer spreads faster. There is a corresponding increase in the non-coherent turbulence in this region near the side walls. The increased spreading rates and overall turbulence in the shear layer, in turn, tend to suppress the rolling-up of the separated shear layer into organized structures. This effect is rapidly carried into the core two-dimensional flow region as the streamwise vortex grows under the influence of the adverse pressure gradient. The surface visualizations provide further evidence of the existence of secondary flows near the side walls.",
author = "{\"O}t{\"u}gen, {M. V.} and G. Papadopoulos and George Vradis and G. Muckenthaler",
year = "1993",
month = "1",
language = "English (US)",
volume = "14",
pages = "213--216",
journal = "Experiments in Fluids",
issn = "0723-4864",
publisher = "Springer Verlag",
number = "3",

}

TY - JOUR

T1 - Spanwise characteristics of the separated flow in a suddenly expanding duct

AU - Ötügen, M. V.

AU - Papadopoulos, G.

AU - Vradis, George

AU - Muckenthaler, G.

PY - 1993/1

Y1 - 1993/1

N2 - The secondary flow due to the growth of the streamwise vortices near the side walls serves to diminish the spanwise uniformity of the time-mean flow properties. In the region adjacent to the side walls, momentum mixing is enhanced due to the existence of the secondary flow and the separated shear layer spreads faster. There is a corresponding increase in the non-coherent turbulence in this region near the side walls. The increased spreading rates and overall turbulence in the shear layer, in turn, tend to suppress the rolling-up of the separated shear layer into organized structures. This effect is rapidly carried into the core two-dimensional flow region as the streamwise vortex grows under the influence of the adverse pressure gradient. The surface visualizations provide further evidence of the existence of secondary flows near the side walls.

AB - The secondary flow due to the growth of the streamwise vortices near the side walls serves to diminish the spanwise uniformity of the time-mean flow properties. In the region adjacent to the side walls, momentum mixing is enhanced due to the existence of the secondary flow and the separated shear layer spreads faster. There is a corresponding increase in the non-coherent turbulence in this region near the side walls. The increased spreading rates and overall turbulence in the shear layer, in turn, tend to suppress the rolling-up of the separated shear layer into organized structures. This effect is rapidly carried into the core two-dimensional flow region as the streamwise vortex grows under the influence of the adverse pressure gradient. The surface visualizations provide further evidence of the existence of secondary flows near the side walls.

UR - http://www.scopus.com/inward/record.url?scp=70450237752&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70450237752&partnerID=8YFLogxK

M3 - Article

VL - 14

SP - 213

EP - 216

JO - Experiments in Fluids

JF - Experiments in Fluids

SN - 0723-4864

IS - 3

ER -