NUMERICAL MODELING OF THE FLAT AIR JET PHYSICAL PROPERTIES IN A ROOM

2025;
: 11-15
https://doi.org/10.23939/jtbp2025.02.011
Received: September 03, 2025
Revised: October 10, 2025
Accepted: November 03, 2025
1
Lviv Polytechnic National University
2
Lviv Polytechnic National University, Department of Building Production
3
Lviv Polytechnic National University
4
Lviv Polytechnic National University, Department of Heat and Gas Supply and Ventilation
5
Lviv Polytechnic National University

The article presents the study results of air distribution in a room with a flat air jet. In particular, dynamic pressure, density and viscosity of air flow were considered. Aim of a paper is to numerically simulate these physical properties of a flat air jet in a room. A graphical representation of air jet parameters was obtained using package CFD Ansys FLUENT software. A hypothesis of applying Mendeleev-Clapeyron equation to moving air flow was considered. Flat air jets have been found to be effective in terms of velocity attenuation in indoor air distribution. The dependence of the tidal flat compressed air stream velocity on time and longitudinal current coordinate simultaneously is graphically presented. Their proper long-range allows for comfortable microclimate conditions using a minimum number of them. Convergence of experimental studies results and numerical modeling confirms adequacy of a theory of the experiment.

Dovhaliuk, V., & Mileikovskyi, V. (2018). New approach for refined efficiency estimation of air exchange organization. International Journal of Engineering and Technology (UAE), 7(3.2), 591-596. doi:10.14419/ijet.v7i3.2.14596.
https://doi.org/10.14419/ijet.v7i3.2.14596
Gumen, O., Dovhaliuk, V., & Mileikovskyi, V. (2019). Geometric representation of turbulent macrostructure in 3D jets. ICGG 2018, Proceedings of the 18-th International Conference on Geometry and Graphics, 739-745. doi:10.1007/978-3-319-95588-9_61.
https://doi.org/10.1007/978-3-319-95588-9_61
Mileikovskyi, V., Tkachenko, T. (2021). Precise Explicit Approximations of the Colebrook-White Equation for Engineering Systems. Lecture Notes in Civil Engineering, 100 LNCE, 303-310. https://doi.org/10.1007/978-3-030-57340-9_37.
https://doi.org/10.1007/978-3-030-57340-9_37
Myroniuk, K., Furdas, Y., Zhelykh, V., and Yurkevych, Y. (2024). Examining Wind Flow's Impact on Multi-Storey Buildings: A Quest for Quality Improvement. Production Engineering Archives, 30 (1) 57-66. DOI: 10.30657/pea.2024.30.5.
https://doi.org/10.30657/pea.2024.30.5
Myroniuk, K., Voznyak, O., Savchenko, O., Kasynets, M. (2023). Mathematical Modeling of an Air Flow Leakage with the Jets Interaction at the Variable Mode. Lecture Notes in Civil Engineering, 290 LNCE, 289-298. DOI: 10.1007/978-3-031-14141-6_29.
https://doi.org/10.1007/978-3-031-14141-6_29
Spodyniuk, N., Gulai, B., Zhelykh, V., Shapoval, S. (2019). Leveling of pressure flow of radial ventilator in mine ventilation system. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu; 6, 80-86. https://www.nvngu.in.ua .
https://doi.org/10.29202/nvngu/2019-6/12
Tkachenko, T., Mileikovskyi, V. (2021). Assessment of Light Transmission for Comfort and Energy Efficient Insolation by "Green Structures". Advances in Intelligent Systems and Computing, 1296, 139-151. https://doi.org/10.1007/978-3-030-63403-2_13.
https://doi.org/10.1007/978-3-030-63403-2_13
Vranay, F., Vranayova, Z. (2020). Influence of heat source choice on building energy certification process and CO2 emissions. Lecture Notes in Civil Engineering, 47, 541-548. https://doi.org/10.1007/978-3-030-27011-7_69 .
https://doi.org/10.1007/978-3-030-27011-7_69
Voznyak, O., Savchenko, O., Spodyniuk, N., Sukholova, I., Kasynets, M., Dovbush, O. (2022). Improving of ventilation efficiency at air distribution by the swirled air jets. Pollack Periodica, 17(1), 123 - 127. doi:https://doi.org/10.1556/606.2021.00419.
https://doi.org/10.1556/606.2021.00419
Voznyak, O., Sukholova, I., Yurkevych, Yu., & Dovbush, O. (2018). Thermal modernization of industrial  rooms air conditioning system, Theory and Building Practice, 888, 36-42.  https://science.lpnu.ua/sctp/all-volumes-and-issues/volume-888-2018/ther... (in Ukrainian).
Shapoval S, Shapoval P, Zhelykh V, Pona O, Spodyniuk N, Gulai B, Savchenko O, Myroniuk K. (2017). Ecological and energy aspects of using the combined solar collectors for low-energy houses. Chemistry & chemical technology; 11(4): 503-508. https://doi.org/10.23939/chcht11.04.503.
https://doi.org/10.23939/chcht11.04.503
Kapalo, P., Domnita, F., Bacotiu, C., & Spodyniuk, N. (2018). The impact of carbon dioxide concentration on the human health - case study, Journal of Applied Engineering Sciences, Vol. 8, no. 1, 61-66. ISSN 2284-7197, https://doi:10.2478/jaes-2018-0008.
https://doi.org/10.2478/jaes-2018-0008
Zhelykh V, Yurkevych Yu, Voznyak O, Sukholova I, Dovbush O. (2021). Enhancing of energetic and economic efficiency of air distribution by swirled-compact air jets. Production Engineering Archives; 27(3): 171-175. https://doi.org/10.30657/pea.2021.27.22.
https://doi.org/10.30657/pea.2021.27.22
Lis A, Spodyniuk N. (2019) The quality of the microclimate in educational buildings subjected to thermal modernization. 11th Conference on Interdisciplinary Problems in Environmental Protection and Engineering EKO-DOK, E3S Web of Conferences 2019; 100(1): 00048. https://doi.org/10.1051/e3sconf/201910000048.
https://doi.org/10.1051/e3sconf/201910000048
Pietrucha T. (2017) Ability to determine the quality of indoor air in classrooms without sensors. E3S Web of Conferences 2017; 17: 00073. https://doi.org/10.1051/e3sconf/20171700073.
https://doi.org/10.1051/e3sconf/20171700073
Lee Y, Kim Y. (2022) Analysis of indoor air pollutants and guidelines for space and physical activities in multi‐purpose activity space of elementary schools. Energies 2022; 15(1): 220. https://doi.org/10.3390/en15010220.
https://doi.org/10.3390/en15010220
Kapalo, P., Meciarova, L., Vilcekova, S., Burdova, E., Domnita, F., Bacotiu, & C. Peterfi, K. (2019). Investigation of CO2 production depending on physical activity of students. International Journal of Environmental Health Research. Vol. 29, Issue 1, 31-44. ISSN: 09603123. https://doi:10.1080/09603123.2018.1506570.
https://doi.org/10.1080/09603123.2018.1506570
Allmaras, S.R., Johnson, F.T., & Spalart, P.R. (2012). Modifications and clarifications for the implementation of the spalart-allmaras turbulence model ICCFD7-1902. 7th International Conference on Computational Fluid Dynamics, Hawaii. https://www.iccfd.org/iccfd7/assets/pdf/papers/ICCFD7-1902_paper.pdf.