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First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address.Yulia R. Kareeva, candidate of technical sciences, associate professor, Kazan State University of Architecture and Engineering, Kazan, Russian Federation. E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Arslan M. Ziganshin, doctor of technical sciences, professor, Kazan State University of Architecture and Engineering, Kazan, Russian Federation E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Mariya B. Chukhlova, specialist of department IAS of scientific research, Kazan State University of Architecture and Engineering, Kazan, Russian Federation. E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Title of the articleStatement of the problem of the flow in a node consisting of an exhaust hole and a 90° elbow
Abstract.When designing ventilation systems in modern buildings, atypical schemes that include a large number of shaped elements are increasingly used. At the same time, the aerodynamic calculation is carried out using the local resistance coefficients of single elements, when their mutual influence on each other is not taken into account. The purpose of the study is to determine the influence of the settings and models of the computer complex on the adequacy of modeling the flow in a node consisting of a sequentially located exhaust hole and elbow. To achieve this goal, the following tasks are solved: determining the influence of the numerical model settings on the convergence of the iterative process; validation of the KMR values and outlines of vortex zones obtained using different combinations of turbulence models and wall functions, average velocity in the exhaust channel, for design options - “straight”, “long” and “short” channel. Results. The influence of the combination of turbulence models and near-wall functions on the adequacy of the resulting flow in a node containing an elbow and an exhaust hole at different speeds was determined, flow patterns and outlines of vortex zones were obtained for the considered node configurations, and local resistance coefficients were calculated. Conclusions. The results of the study indicate that closely spaced elements have a significant impact on the overall resistance of the node. This fact must be taken into account when performing aerodynamic calculations of ventilation and air conditioning systems.
Keywords.ventilation, exhaust opening, elbow, computational fluid dynamics, vortex zones, local drag coefficient
For citations:Kareeva Yu.R., Ziganshin A.M. , Chukhlova M.B. Statement of the problem of the flow in a node consisting of an exhaust hole and a 90° elbow // News KSUAE, 2023, № 4(66), p.346- 356, DOI: 10.52409/20731523_2023_4_346, EDN: XOQLXY


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