Turbulent pipe flow downstream of a 90° bend

Leo H.O. Hellström; Metodi B. Zlatinov; Guangjun Cao; Alexander J. Smits

doi:10.1017/jfm.2013.534

Turbulent pipe flow downstream of a 90° bend

Leo H.O. Hellström, Metodi B. Zlatinov, Guangjun Cao, Alexander J. Smits

Mechanical & Aerospace Engineering

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52 Scopus citations

Abstract

Time-resolved stereoscopic PIV was used to investigate the curvature-induced structures downstream of a 90° bend at Reynolds numbers between 20× 10³ and 115× 10³. Data were taken at three downstream locations to investigate the evolution of the structures. Snapshot proper orthogonal decomposition (POD) analysis shows that the most energetic structure is not the well-known Dean motion but a bimodal single cell structure with alternating direction of rotation, called the 'swirl switching' mode. The strengths of the Dean motion and the swirl-switching structures are similar, indicating that the difference in energy is related to their duration of occurrence, where the Dean motion is associated with a comparatively rapid transition between the two states in the swirl switching mode.

Original language	English (US)
Pages (from-to)	R7
Journal	Journal of Fluid Mechanics
Volume	735
DOIs	https://doi.org/10.1017/jfm.2013.534
State	Published - 2013

All Science Journal Classification (ASJC) codes

Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Applied Mathematics

Keywords

low-dimensional models
turbulent boundary layers
vortex dynamics

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10.1017/jfm.2013.534

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title = "Turbulent pipe flow downstream of a 90° bend",

abstract = "Time-resolved stereoscopic PIV was used to investigate the curvature-induced structures downstream of a 90° bend at Reynolds numbers between 20× 103 and 115× 103. Data were taken at three downstream locations to investigate the evolution of the structures. Snapshot proper orthogonal decomposition (POD) analysis shows that the most energetic structure is not the well-known Dean motion but a bimodal single cell structure with alternating direction of rotation, called the 'swirl switching' mode. The strengths of the Dean motion and the swirl-switching structures are similar, indicating that the difference in energy is related to their duration of occurrence, where the Dean motion is associated with a comparatively rapid transition between the two states in the swirl switching mode.",

keywords = "low-dimensional models, turbulent boundary layers, vortex dynamics",

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doi = "10.1017/jfm.2013.534",

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T1 - Turbulent pipe flow downstream of a 90° bend

AU - Hellström, Leo H.O.

AU - Zlatinov, Metodi B.

AU - Cao, Guangjun

AU - Smits, Alexander J.

PY - 2013

Y1 - 2013

N2 - Time-resolved stereoscopic PIV was used to investigate the curvature-induced structures downstream of a 90° bend at Reynolds numbers between 20× 103 and 115× 103. Data were taken at three downstream locations to investigate the evolution of the structures. Snapshot proper orthogonal decomposition (POD) analysis shows that the most energetic structure is not the well-known Dean motion but a bimodal single cell structure with alternating direction of rotation, called the 'swirl switching' mode. The strengths of the Dean motion and the swirl-switching structures are similar, indicating that the difference in energy is related to their duration of occurrence, where the Dean motion is associated with a comparatively rapid transition between the two states in the swirl switching mode.

AB - Time-resolved stereoscopic PIV was used to investigate the curvature-induced structures downstream of a 90° bend at Reynolds numbers between 20× 103 and 115× 103. Data were taken at three downstream locations to investigate the evolution of the structures. Snapshot proper orthogonal decomposition (POD) analysis shows that the most energetic structure is not the well-known Dean motion but a bimodal single cell structure with alternating direction of rotation, called the 'swirl switching' mode. The strengths of the Dean motion and the swirl-switching structures are similar, indicating that the difference in energy is related to their duration of occurrence, where the Dean motion is associated with a comparatively rapid transition between the two states in the swirl switching mode.

KW - low-dimensional models

KW - turbulent boundary layers

KW - vortex dynamics

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JO - Journal of Fluid Mechanics

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ER -

Turbulent pipe flow downstream of a 90° bend

Abstract

All Science Journal Classification (ASJC) codes

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