Structure identification in pipe flow using proper orthogonal decomposition

Leo H.O. Hellström; Alexander J. Smits

doi:10.1098/rsta.2016.0086

Structure identification in pipe flow using proper orthogonal decomposition

Leo H.O. Hellström, Alexander J. Smits

Mechanical & Aerospace Engineering

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29 Scopus citations

Abstract

The energetic motions in direct numerical simulations of turbulent pipe flow at Re_τ = 685 are investigated using proper orthogonal decomposition. The procedure is extended such that a pressure component is identified in addition to the three-component velocity field for each mode. The pressure component of the modes is shown to align with the streamwise velocity component associated with the large-scale motions, where positive pressure coincides with positive streamwise velocity, and vice versa. The streamwise evolution of structures is then visualized using a conditional mode, which exhibit a strong similarity to the large-scale, low-momentum motions. A low-pressure region is present in the downstream section of the structure, and a high-pressure region is present in the upstream section.

Original language	English (US)
Article number	20160086
Journal	Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume	375
Issue number	2089
DOIs	https://doi.org/10.1098/rsta.2016.0086
State	Published - Mar 13 2017

All Science Journal Classification (ASJC) codes

General Engineering
General Physics and Astronomy
General Mathematics

Keywords

Coherent structures
Turbulence
Wall bounded flow

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10.1098/rsta.2016.0086

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AB - The energetic motions in direct numerical simulations of turbulent pipe flow at Reτ = 685 are investigated using proper orthogonal decomposition. The procedure is extended such that a pressure component is identified in addition to the three-component velocity field for each mode. The pressure component of the modes is shown to align with the streamwise velocity component associated with the large-scale motions, where positive pressure coincides with positive streamwise velocity, and vice versa. The streamwise evolution of structures is then visualized using a conditional mode, which exhibit a strong similarity to the large-scale, low-momentum motions. A low-pressure region is present in the downstream section of the structure, and a high-pressure region is present in the upstream section.

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Structure identification in pipe flow using proper orthogonal decomposition

Abstract

All Science Journal Classification (ASJC) codes

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