title: Ð§Ð¸ÑÐ»ÐµÐ½Ð½Ð¾Ðµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð¿ÐµÑÐµÐ¼ÐµÑÐ¸Ð²Ð°ÑÑÐµÐ¹ Ð²ÐµÐ½ÑÐ¸Ð»ÑÑÐ¸Ð¸ Ð² ÑÐµÑÑÐ¾Ð²Ð¾Ð¼ Ð¿Ð¾Ð¼ÐµÑÐµÐ½Ð¸Ð¸ Ð¿ÑÐ¸ Ð¿ÐµÑÐ¸Ð¾Ð´Ð¸ÑÐµÑÐºÐ¸ Ð¼ÐµÐ½ÑÑÑÐµÐ¼ÑÑ ÑÐ°ÑÑ Ð¾Ð´Ðµ Ð¿ÑÐ¸ÑÐ¾ÑÐ½Ð¾Ð³Ð¾ Ð²Ð¾Ð·Ð´ÑÑ Ð°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Numerical modelling of air flow in a testventilated room with ceiling supply under periodic flow rate variation
Creators: name: Ð¡ÑÑÐ¾ÐµÐ²Ð°, ÐÐ½Ð°ÑÑÐ°ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2024
Subjects: ÑÑÑÐ±ÑÐ»ÐµÐ½ÑÐ½Ð¾Ðµ ÑÐµÑÐµÐ½Ð¸Ðµ
Ð¿Ð»Ð¾ÑÐºÐ°Ñ ÑÑÑÑÑ
ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ñ Ð ÐµÐ¹Ð½Ð¾Ð»ÑÐ´ÑÐ°
Ð¿ÐµÑÐ¸Ð¾Ð´Ð¸ÑÐµÑÐºÐ°Ñ ÑÐºÐ¾ÑÐ¾ÑÑÑ Ð¿Ð¾Ð´Ð°ÑÐ¸
Ð¸ÑÑÐ¾ÑÐ½Ð¸Ðº Ð¿ÑÐ¸Ð¼ÐµÑÐµÐ¹
turbulent airflow
plain jet
Reynolds Averaged Navier-Stokes Equations
time-dependent inlet velocity
pollutant source

description: Ð ÑÐ°Ð±Ð¾ÑÐµ Ð¿ÑÐµÐ´ÑÑÐ°Ð²Ð»ÐµÐ½Ñ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÑ ÑÐ¸ÑÐ»ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ ÑÐµÑÐµÐ½Ð¸Ñ Ð²Ð¾Ð·Ð´ÑÑÐ° Ð² ÑÐµÑÑÐ¾Ð²Ð¾Ð¼ Ð²ÐµÐ½ÑÐ¸Ð»Ð¸ÑÑÐµÐ¼Ð¾Ð¼ Ð¿Ð¾Ð¼ÐµÑÐµÐ½Ð¸Ð¸ Ñ Ð¿ÑÐ¸Ð¿Ð¾ÑÐ¾Ð»Ð¾ÑÐ½Ð¾Ð¹ Ð¿Ð¾Ð´Ð°ÑÐµÐ¹ Ð¿ÑÐ¸ Ð¿ÐµÑÐ¸Ð¾Ð´Ð¸ÑÐµÑÐºÐ¾Ð¼ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸Ð¸ ÑÐ°ÑÑÐ¾Ð´Ð°. ÐÐ°Ð´Ð°ÑÐ° ÑÐµÑÐ°Ð»Ð°ÑÑ Ð² 2D Ð¿Ð¾ÑÑÐ°Ð½Ð¾Ð²ÐºÐµ Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ RANS/URANS Ð¿Ð¾Ð´ÑÐ¾Ð´Ð° Ñ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸ÐµÐ¼ k-Îµ RNG Ð¼Ð¾Ð´ÐµÐ»Ð¸ ÑÑÑÐ±ÑÐ»ÐµÐ½ÑÐ½Ð¾ÑÑÐ¸. Ð Ð°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ Ð´Ð²Ðµ ÐºÐ¾Ð½ÑÐ¸Ð³ÑÑÐ°ÑÐ¸Ð¸ ÑÐµÑÑÐ¾Ð²Ð¾Ð³Ð¾ Ð¿Ð¾Ð¼ÐµÑÐµÐ½Ð¸Ñ: Ñ Ð¾Ð´Ð½Ð¸Ð¼ Ð¸ Ð´Ð²ÑÐ¼Ñ Ð¿ÑÐ¾ÑÐ¸Ð²Ð¾Ð¿Ð¾Ð»Ð¾Ð¶Ð½Ð¾ ÑÐ°ÑÐ¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð½ÑÐ¼Ð¸ Ð¿ÑÐ¸ÑÐ¾ÑÐ½ÑÐ¼Ð¸ Ð¾ÑÐ²ÐµÑÑÑÐ¸ÑÐ¼Ð¸. ÐÐ»Ñ ÐºÐ°Ð¶Ð´Ð¾Ð³Ð¾ Ð²Ð°ÑÐ¸Ð°Ð½ÑÐ° Ð¿Ð¾ÑÑÐ°Ð²Ð»ÐµÐ½Ð° Ð¸ ÑÐµÑÐµÐ½Ð° ÑÑÐ°ÑÐ¸Ð¾Ð½Ð°ÑÐ½Ð°Ñ Ð·Ð°Ð´Ð°ÑÐ° Ñ Ð¿Ð¾ÑÑÐ¾ÑÐ½Ð½ÑÐ¼ ÑÐ°ÑÑÐ¾Ð´Ð¾Ð¼ Ð¿ÑÐ¸ÑÐ¾ÑÐ½Ð¾Ð³Ð¾ Ð²Ð¾Ð·Ð´ÑÑÐ°. Ð§Ð¸ÑÐ»ÐµÐ½Ð½Ð¾Ðµ ÑÐµÑÐµÐ½Ð¸Ðµ Ð´Ð»Ñ Ð¿Ð¾ÑÑÐ°Ð½Ð¾Ð²ÐºÐ¸ Ñ Ð¾Ð´Ð½Ð¸Ð¼ Ð²ÑÐ¾Ð´Ð½ÑÐ¼Ð¸ Ð¾ÑÐ²ÐµÑÑÑÐ¸ÐµÐ¼ ÑÐ¾Ð¿Ð¾ÑÑÐ°Ð²Ð»ÐµÐ½Ð¾ Ñ Ð»Ð¸ÑÐµÑÐ°ÑÑÑÐ½ÑÐ¼Ð¸ Ð´Ð°Ð½Ð½ÑÐ¼Ð¸ ÑÐµÑÑÐ¾Ð²Ð¾Ð³Ð¾ ÑÐºÑÐ¿ÐµÑÐ¸Ð¼ÐµÐ½ÑÐ° (Nielsen, 1990). ÐÐ»Ñ Ð¿Ð¾Ð¼ÐµÑÐµÐ½Ð¸Ñ Ñ Ð´Ð²ÑÐ¼Ñ Ð¿ÑÐ¸ÑÐ¾ÑÐ½ÑÐ¼Ð¸ ÑÑÑÑÑÐ¼Ð¸, Ð¿Ð¾Ð´Ð°Ð²Ð°ÐµÐ¼ÑÐ¼Ð¸ Ð¸Ð· Ð¿ÑÐ¾ÑÐ¸Ð²Ð¾Ð¿Ð¾Ð»Ð¾Ð¶Ð½Ð¾ ÑÐ°ÑÐ¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð½ÑÑ Ð¾ÑÐ²ÐµÑÑÑÐ¸Ð¹, Ð±ÑÐ»Ð¸ ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ Ð²Ð°ÑÐ¸Ð°Ð½ÑÑ Ñ ÑÐ¸Ð½ÑÐ°Ð·Ð½Ð¾Ð¹ Ð¸ Ð¿ÑÐ¾ÑÐ¸Ð²Ð¾ÑÐ°Ð·Ð½Ð¾Ð¹ Ð¿ÐµÑÐ¸Ð¾Ð´Ð¸ÑÐµÑÐºÐ¾Ð¹ Ð¿Ð¾Ð´Ð°ÑÐµÐ¹ Ð²Ð¾Ð·Ð´ÑÑÐ°. ÐÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ñ Ð¾ÑÐµÐ½ÐºÐ¸ ÑÐ°Ð·Ð¼ÐµÑÐ½Ð¾ÑÑÐ¸ ÑÐ°ÑÑÐµÑÐ½Ð¾Ð¹ ÑÐµÑÐºÐ¸ Ð¸ Ð²ÐµÐ»Ð¸ÑÐ¸Ð½Ñ ÑÐ°Ð³Ð° Ð¿Ð¾ Ð²ÑÐµÐ¼ÐµÐ½Ð¸, ÑÑÐµÐ±ÑÑÑÐ¸ÐµÑÑ Ð´Ð»Ñ ÐºÐ¾ÑÑÐµÐºÑÐ½Ð¾Ð³Ð¾ Ð¾Ð¿Ð¸ÑÐ°Ð½Ð¸Ñ Ð½ÐµÑÑÐ°ÑÐ¸Ð¾Ð½Ð°ÑÐ½Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ. ÐÐ¾ÐºÐ°Ð·Ð°Ð½Ð¾, ÑÑÐ¾ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸Ðµ Ð¿ÐµÑÐ¸Ð¾Ð´Ð° Ð¿Ð¾Ð´Ð°ÑÐ¸ Ð²Ð¾Ð·Ð´ÑÑÐ° ÑÐ»Ð°Ð±Ð¾ ÑÐºÐ°Ð·ÑÐ²Ð°ÐµÑÑÑ Ð½Ð° ÑÐµÑÐµÐ½Ð¸Ð¸. Ð Ð°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ð° Ð¼Ð¾Ð´ÐµÐ»ÑÐ½Ð°Ñ Ð·Ð°Ð´Ð°ÑÐ° Ð¾Ð± ÑÐ´Ð°Ð»ÐµÐ½Ð¸Ð¸ Ð¿ÑÐ¸Ð¼ÐµÑÐ¸ Ñ Ð¸ÑÑÐ¾ÑÐ½Ð¸ÐºÐ¾Ð¼, ÑÐ°Ð²Ð½Ð¾Ð¼ÐµÑÐ½Ð¾ ÑÐ°ÑÐ¿ÑÐµÐ´ÐµÐ»ÐµÐ½Ð½ÑÐ¼ Ð¿Ð¾ Ð²ÑÐµÐ¼Ñ Ð¾Ð±ÑÐµÐ¼Ñ. ÐÐ¾ÐºÐ°Ð·Ð°Ð½Ð¾, ÑÑÐ¾ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ ÑÐ´Ð°Ð»ÐµÐ½Ð¸Ñ Ð¿ÑÐ¸Ð¼ÐµÑÐµÐ¹ Ð²ÑÑÐµ Ð¿ÑÐ¸ Ð¿ÐµÑÐ¸Ð¾Ð´Ð¸ÑÐµÑÐºÐ¸ Ð¼ÐµÐ½ÑÑÑÐµÐ¼ÑÑ ÑÐ°ÑÑÐ¾Ð´Ðµ Ð²Ð¾Ð·Ð´ÑÑÐ°. ÐÑÐ¸ ÑÑÐ¾Ð¼ ÑÐ¿Ð¾ÑÐ¾Ð± Ð½ÐµÑÑÐ°ÑÐ¸Ð¾Ð½Ð°ÑÐ½Ð¾Ð¹ Ð¿Ð¾Ð´Ð°ÑÐ¸ Ð¿Ð¾ÑÑÐ¸ Ð½Ðµ ÑÐºÐ°Ð·ÑÐ²Ð°Ð»ÑÑ. ÐÐ°ÑÑÐ´Ñ Ñ ÑÐ°Ð²Ð½Ð¾Ð¼ÐµÑÐ½Ð¾ ÑÐ°ÑÐ¿ÑÐµÐ´ÐµÐ»ÐµÐ½Ð½ÑÐ¼ Ð¸ÑÑÐ¾ÑÐ½Ð¸ÐºÐ¾Ð¼ Ð±ÑÐ» ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½ Ð»Ð¾ÐºÐ°Ð»Ð¸Ð·Ð¾Ð²Ð°Ð½Ð½ÑÐ¹, ÑÐ°ÑÐ¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð½ÑÐ¹ Ð² ÑÐµÐ½ÑÑÐ°Ð»ÑÐ½Ð¾Ð¹ ÑÐ°ÑÑÐ¸ ÑÐ°ÑÑÐµÑÐ½Ð¾Ð¹ Ð¾Ð±Ð»Ð°ÑÑÐ¸. Ð£ÑÑÐ°Ð½Ð¾Ð²Ð»ÐµÐ½Ð¾, ÑÑÐ¾ Ð² Ð´Ð°Ð½Ð½Ð¾Ð¼ ÑÐ»ÑÑÐ°Ðµ ÑÑÐ°ÑÐ¸Ð¾Ð½Ð°ÑÐ½Ð°Ñ Ð¿Ð¾Ð´Ð°ÑÐ° Ð²Ð¾Ð·Ð´ÑÑÐ° Ð±Ð¾Ð»ÐµÐµ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð°. Ð¥ÑÐ¶Ðµ Ð²ÑÐµÐ³Ð¾ Ð¿ÑÐ¸Ð¼ÐµÑÑ ÑÐ´Ð°Ð»ÑÐ»Ð°ÑÑ Ð² ÑÐ»ÑÑÐ°Ðµ ÑÐ¸Ð½ÑÐ°Ð·Ð½Ð¾Ð¹ Ð¿Ð¾Ð´Ð°ÑÐ¸ Ð²Ð¾Ð·Ð´ÑÑÐ°.
description: The paper presents the results of numerical modelling of air flow in a test ventilated room with ceiling supply under periodic flow rate variation. The problem was solved in 2D formulation based on the RANS/URANS approach using k-Îµ RNG turbulence model. Two test room configurations are considered: with one and two oppositely located supply openings. For each configuration, a steady-state problem with constant supply air flow rate is set and solved. The numerical solution for the single inlet configuration is compared with the literature data of the test experiment (Nielsen, 1990). For a room with two supply jets from oppositely located openings, in-phase and out-of-phase periodic air supply were considered. The dimensionality of the computational grid and the time step required for a correct description of the unsteady flow have been estimated. It is shown that changing the period of air supply has a weak effect on the flow. The modelling problem of impurity removal with a source uniformly distributed over the whole volume is considered. It is shown that the efficiency of impurity removal is higher at periodically varying air flow rate. In this case, the method of unsteady supply had almost no effect. Along with a uniformly distributed source, a localized source located in the central part of the design domain was considered. It was found that in this case the stationary air supply is more effective. The impurity was removed the worst in the case of in-phase air supply.