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Peer-reviewedCC BYOpen Physics

Comparative analysis of dual (wall-offset) and parallel jets: flow dynamics and vortex shedding characteristics

  • Mondal Tanmoy1
  • Hnaien Nidhal2
  • Neffati Syrine3
  • Abdennaji Tarek Salem4
  • Ghachem Kaouther5
  • Kolsi Lioua6
6 affiliations
  1. 1Department of Mechanical Engineering, National Institute of Technology Patna, Patna, India
  2. 2Department of Energy Engineering, College of Engineering, University of Monastir, Monastir, Tunisia
  3. 3College of Computer Sciences and Software Engineering, University of Ha’il, Ha’il, Saudi Arabia
  4. 4Department of Civil Engineering, College of Engineering, Northern Border University, Arar73222, Saudi Arabia
  5. 5Department of Industrial and Systems Engineering, College of Engineering, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia
  6. 6Department of Mechanical Engineering, College of Engineering, University of Ha’il, Ha’il81451, Saudi Arabia
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Abstract

In the current investigation, comparison between a flow which combines a wall jet and an offset jet, named dual jets (DJ), and two free parallel jets (PJ) is performed considering the same jet’s spacing to jet width ratio d/w = 1. The number of Reynolds (Re) calculated based on the jet width w is considered equal to 10,000. Two-dimensional (2D) unsteady RANS equations have been adopted to simulate both the flow configurations. As clearly depicted from the mean flow finding in the current investigation, far away from the nozzle plate (x = 0), the two jets in PJ configuration merge into a single free jet, while in DJ configuration, they combine to form a single classical wall jet. For the two configurations, the time-dependent computation results show a periodic vortex shedding (PVS) phenomenon near the ejection plate. This phenomenon is like what would be observed behind the flow over 2D bluff body. The dimensionless Strouhal number (St) representing the frequency of vortex shedding in the case of PJ (St = 0.24) is noted to be higher than that for the DJ (St = 0.22).

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Cite

BibTeXRIS
BibTeX
@article{tanmoy2026comparative,
  title = {{Comparative analysis of dual (wall-offset) and parallel jets: flow dynamics and vortex shedding characteristics}},
  author = {Mondal Tanmoy and Hnaien Nidhal and Neffati Syrine and Abdennaji Tarek Salem and Ghachem Kaouther and Kolsi Lioua},
  journal = {Open Physics},
  year = {2026},
  month = oct,
  doi = {10.1515/phys-2025-0323},
  url = {https://doi.org/10.1515/phys-2025-0323},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Comparative analysis of dual (wall-offset) and parallel jets: flow dynamics and vortex shedding characteristics
AU  - Mondal Tanmoy
AU  - Hnaien Nidhal
AU  - Neffati Syrine
AU  - Abdennaji Tarek Salem
AU  - Ghachem Kaouther
AU  - Kolsi Lioua
PY  - 2026
DA  - 2026/10/26
JO  - Open Physics
DO  - 10.1515/phys-2025-0323
UR  - https://doi.org/10.1515/phys-2025-0323
AB  - In the current investigation, comparison between a flow which combines a wall jet and an offset jet, named dual jets (DJ), and two free parallel jets (PJ) is performed considering the same jet’s spacing to jet width ratio d/w = 1. The number of Reynolds (Re) calculated based on the jet width w is considered equal to 10,000. Two-dimensional (2D) unsteady RANS equations have been adopted to simulate both the flow configurations. As clearly depicted from the mean flow finding in the current investigation, far away from the nozzle plate (x = 0), the two jets in PJ configuration merge into a single free jet, while in DJ configuration, they combine to form a single classical wall jet. For the two configurations, the time-dependent computation results show a periodic vortex shedding (PVS) phenomenon near the ejection plate. This phenomenon is like what would be observed behind the flow over 2D bluff body. The dimensionless Strouhal number (St) representing the frequency of vortex shedding in the case of PJ (St = 0.24) is noted to be higher than that for the DJ (St = 0.22).
SN  - 2391-5471
ER  -