Proper orthogonal decomposition analysis of coherent motions in a turbulent annular jet

Zhang, Y.; Vanierschot, Maarten

doi:10.1007/s10483-021-2764-8

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…They utilized the POD method to analyze synthetic velocity vector fields with known characteristics and discovered that, in the case of repeatable flow patterns, only the first mode was adequate for reconstructing the physical properties of the flow. Zhang et al [33] utilized the large eddy simulation (LES) method to numerically simulate a three-dimensional incompressible flow of an annular jet at a Reynolds number of 8500. The velocity fluctuation vectors were subjected to proper orthogonal decomposition (POD) analysis to investigate the flow dynamics of the wake flow.…”

Section: Introductionmentioning

confidence: 99%

Vortex of a Symmetric Jet Structure in a Natural Gas Pipeline via Proper Orthogonal Decomposition

Li,

Lu,

Zhao

et al. 2024

Processes

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The impact of particle addition jets on the flow field in natural gas pipelines was investigated, and the structural information of the flow field at different flow velocities in a symmetric jet flow was analyzed via numerical simulation. The results of coherent structures in the high-pressure natural gas pipeline reveal vortex structures of varying sizes both upstream and downstream of the jet flow. To determine the spatial distribution of the main vortex structures in the flow field, proper orthogonal decomposition (POD) mode analysis was performed on the unsteady numerical results. Moreover, the detailed spatial characteristics of the coherent vortex structures represented by each mode were obtained. The results indicate that the large-scale vortex structures within the pipeline are balanced and stable, with their energy increasing as the jet flow velocity increases. Additionally, higher-order modes exhibit significant shedding of small-scale vortex structures downstream of the jet flow. In this research, coherent structures present in symmetric particle addition jets are provided, offering theoretical support for future investigations on the distribution of particle image velocimetry (PIV) flowmeters.

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Section: Introductionmentioning

confidence: 99%

Vortex of a Symmetric Jet Structure in a Natural Gas Pipeline via Proper Orthogonal Decomposition

Li,

Lu,

Zhao

et al. 2024

Processes

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“…Past research has predominantly focused on annular jets with a single jet. Works by Del Taglia et al [1], Danlos et al [2], Zhang and Vanierschot [3], Ryzhenkov et al [4], Vanierschot et al [5], Yang et al [6], Sadr et al [7], and Trá vnı ček and Tesař [8] serve as key examples. Conversely, studies on flows with double annular jets have been less frequent, with notable contributions made by Vucinic and Hazarika [9], Broeckhoven et al [10], and Huang and Tsai [11].…”

Section: Introductionmentioning

confidence: 99%

Numerical Prediction of a Turbulent Flow with Double Annular Jets for Different Reynolds Numbers

Ali,

Habib,

Rachid

2023

IJHT

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This research undertakes a numerical investigation of an axisymmetric double-jet semiconfined annular flow produced by a burner. The endeavor aims to thoroughly decipher the behavior of these turbulent flows within a double annular jet, with a focus on characterizing the mixing and recirculation regions. Analyses of the annular jet were conducted for three distinct Reynolds numbers (6683, 8874, and 11065). Numerical simulations were performed using a computational fluid dynamics (CFD) calculation code, employing two turbulence models-k-epsilon and SST k-ω. The governing differential equations, discretized for the flow, were solved via the finite volume method, utilizing the semi-implicit method algorithm for pressure-linked equations. Findings revealed the existence of three recirculation zones separated by the annular jets. The first, a minute zone, is situated between the two annular jets. The second, a medium-sized zone, resides just behind the nozzle near the injection axis, below the primary jet. The third, a large zone, is positioned near the upper wall of the combustion chamber. It was observed that the size of the initial small recirculation zone exhibited negligible variation with changes in the Reynolds number. However, the second medium-sized zone experienced notable alterations with the Reynolds number. The third large zone generated an extensive toroidal vortex at higher Reynolds numbers. These recirculation zones offer potential for control to optimize fuel-air mixing, aiming to achieve near-perfect combustion while minimizing pollutant emissions. The numerical simulation results generally exhibited strong agreement with experimental findings.

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“…Many experimental and numerical research works have been published on the annular jets flow, for example: Sheen et al [5], Vanierschot and Bulck [6], Patte-Rouland et al [7], Moore et al [8], Ko et al [9], Boguslawski et al [10], Zhang et al [11], Percin et al [12], Himadri Chattopadhyay [13], Yang et al [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Inner Diameter and Reynolds Number on the Recirculation Zone in Annular Jet Flow

Habib

Sahnoun

Ismail

2022

International Journal of Applied Mechanics and Engineering

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In this paper, we focus on the effect of the inner diameter and Reynolds number on the recirculation zone in an annular jet flow with numerical simulation by resolving the Reynolds-averaged Navier-Stokes equations with the first closed model of turbulence k-epsilon. The annular jet plays an essential role in stabilizing the flame in the burner which is used in many industrial applications. The annular jet is characterized by the inner and outer diameter. In this study, three different inner diameters are adopted with constant width of the annular jet. We adopted also three different values of the Reynolds number show the effect of the Reynolds number on the recirculation zone. The simulation is realized by a CFD code which uses the finite element method. The results obtained from this study are in good agreement with the experimental data. Two recirculation zones are shown; a large recirculation zone at the outlet of the flow and a small recirculation zone just near the injection generated by the annular flow and the inner diameter Di ; it is observed that the size of the recirculation zone increases when the inner diameter increases and the length of the recirculation zone depends only on the inner diameter. This recirculation zone is also affected by the Reynolds number with a very low variation of the recirculation length.

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Proper orthogonal decomposition analysis of coherent motions in a turbulent annular jet

Cited by 6 publications

References 25 publications

Vortex of a Symmetric Jet Structure in a Natural Gas Pipeline via Proper Orthogonal Decomposition

Vortex of a Symmetric Jet Structure in a Natural Gas Pipeline via Proper Orthogonal Decomposition

Numerical Prediction of a Turbulent Flow with Double Annular Jets for Different Reynolds Numbers

Effect of the Inner Diameter and Reynolds Number on the Recirculation Zone in Annular Jet Flow

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