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Proper orthogonal decomposition analysis of the large-scale dynamics of a round turbulent jet in counterflow
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0001-6842-7543
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0002-6326-4084
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0001-5886-415X
2021 (English)In: Physical Review Fluids, E-ISSN 2469-990X, Vol. 6, no 1, article id 014701Article in journal (Refereed) Published
Abstract [en]

Although the mean flow features of the turbulent jet in counterflow have been studied in the past, the large-scale dynamics of this flow configuration remain unexplored. The present work presents the modal analysis, through proper orthogonal decomposition (POD), of large eddy simulations (LESs) of counterflowing jets at different jet-to-counterflow velocity ratios (α=2.2,3.4,5.1) reported in detail by Rovira, Engvall, and Duwig [Phys. Fluids 32, 045102 (2000)PHFLE61070-663110.1063/5.0003239]. In the present study, a qualitative investigation of the three-dimensional (3D) turbulent structure of this jet configuration is performed by vortex identification. Additionally, a simplified description of the origin and development of these coherent structures is presented. Planar two-dimensional (2D) POD results for the case with α=3.4 are directly compared and found to be in close agreement with the results available literature. In this case, over an equal time interval, temporal and spatial resolutions are observed to have a minor effect on mode energy content. All three cases are also analyzed with 3D POD and the evolution of the peak mode frequency with α is studied. Additionally, by employing a wavelet transform, the intermittent behavior of the fundamental mode dynamics is evidenced for the first time. Finally, the jet in counterflow case with α=5.1 is analyzed with a 3D spectral POD. Varying jet penetration, precession, and a stretching and contracting motion are found to be the most dominant modes. 

Place, publisher, year, edition, pages
American Physical Society (APS) , 2021. Vol. 6, no 1, article id 014701
Keywords [en]
Large eddy simulation, Modal analysis, Plasma theory, Vorticity, Intermittent behaviors, Large-scale dynamics, Proper orthogonal decompositions, Temporal and spatial, Threedimensional (3-d), Turbulent structures, Two Dimensional (2 D), Vortex identifications, Wavelet transforms
National Category
Fluid Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-304648DOI: 10.1103/PhysRevFluids.6.014701ISI: 000606325100001Scopus ID: 2-s2.0-85100090099OAI: oai:DiVA.org:kth-304648DiVA, id: diva2:1611551
Note

QC 20220520

Available from: 2021-11-15 Created: 2021-11-15 Last updated: 2025-02-09Bibliographically approved
In thesis
1. In pursuit of clean air through numerical simulations of no-waste pollutant removal
Open this publication in new window or tab >>In pursuit of clean air through numerical simulations of no-waste pollutant removal
2022 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

As epidemiological evidence continues to mount, it has become undeniable that exposure to high levels of airborne pollutants such as SOx and NOx are detrimental to human health. In recent years, millions of premature deaths by stroke, coronary heart disease, and lung cancer worldwide have been linked to poor outdoor air quality.

Unfortunately, not all polluting industries have faced the same stringent regulations. For instance, restrictions on harmful pollutant emissions from road vehicles have remained higher than those from marine transport. This discrepancy between sectors is expected to shrink as an increasing number of industries come into the spotlight of regulators. In this rapidly changing landscape, the demand for effective and innovative pollution abatement solutions is rising.

In the present work, our focus is on investigating the viability of a novel airborne pollutant removal concept. In this no-waste design, SOx and NOx are trapped into ammonium salt particles that can be then sold as an agricultural fertilizer. The gaseous pollutants are first oxidized by ozone, which is then mixed with ammonia in humid air to allow the ammonium particles to form and grow.

The study of this system requires analyzing the interplay between chemical reactions and the turbulent fluid dynamics that enables them through efficient mixing. To this end, numerical simulations are an invaluable tool that facilitates uncovering detailed knowledge where experimental studies may be intractable. Here, we leverage the use of high-fidelity large-eddy simulations to study reactive and non-reactive flow conditions relevant to this multi-pollutant removal solution. These investigations are supplemented by reactor modeling approaches to analyze specific key chemical processes. Finally, we implement and employ state-of-the-art data-driven methods that provide enhanced insight into our numerical datasets. For this purpose, we apply proper orthogonal decomposition, a machine-learning workflow for automated region identification, and global sensitivity analysis.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2022. p. 309
Series
TRITA-SCI-FOU ; 2022:11
Keywords
Air quality, SOx and NOx removal, Ozone oxidation, Aerosol particle formation, Large-eddy simulations, Reactive flows, Proper orthogonal decomposition, Machine learning, Sensitivity analysis
National Category
Mechanical Engineering
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-311573 (URN)978-91-8040-209-5 (ISBN)
Public defence
2022-05-23, https://kth-se.zoom.us/j/61833102899, H1, Teknikringen 33, Stockholm, 10:00 (English)
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Supervisors
Note

QC 220502

Available from: 2022-05-02 Created: 2022-04-29 Last updated: 2022-06-25Bibliographically approved

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Rovira, MarcEngvall, KlasDuwig, Christophe

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