title: Ð§Ð¸ÑÐ»ÐµÐ½Ð½Ð¾Ðµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð°Ð²ÑÐ¾ÐºÐ¾Ð»ÐµÐ±Ð°ÑÐµÐ»ÑÐ½Ð¾Ð³Ð¾ ÑÐµÐ¶Ð¸Ð¼Ð° ÑÐµÑÐµÐ½Ð¸Ñ Ð¿ÑÐ¸ Ð¿Ð¾Ð´Ð°ÑÐµ Ð¿Ð»Ð¾ÑÐºÐ¾Ð¹ ÑÑÑÑÐ¸ Ð²Ð¾Ð·Ð´ÑÑ Ð° Ð² ÑÐµÑÑÐ¾Ð²Ð¾Ðµ Ð²ÐµÐ½ÑÐ¸Ð»Ð¸ÑÑÐµÐ¼Ð¾Ðµ Ð¿Ð¾Ð¼ÐµÑÐµÐ½Ð¸Ðµ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Numerical modeling of self-oscillatory airflow regime formed by a plane jet propagated in a test ventilated space
Creators: name: Ð¡ÑÐµÐ¿Ð°ÑÐµÐ²Ð°, ÐÐºÐ°ÑÐµÑÐ¸Ð½Ð°
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: 2023
Subjects: Ð¢ÑÑÐ±ÑÐ»ÐµÐ½ÑÐ½Ð¾Ðµ ÑÐµÑÐµÐ½Ð¸Ðµ
ÐÐ°ÑÐµÐ¼Ð°ÑÐ¸ÑÐµÑÐºÐ¾Ðµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ
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ÐÐµÐ½ÑÐ¸Ð»ÑÑÐ¸Ñ
ÑÑÑÑÐ¹Ð½ÑÐµ ÑÐµÑÐµÐ½Ð¸Ñ
jet airflows

description: Ð ÑÐ°Ð±Ð¾ÑÐµ Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¸ÑÑÑ ÑÐ¸ÑÐ»ÐµÐ½Ð½Ð¾Ðµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ°ÑÐ¿ÑÐ¾ÑÑÑÐ°Ð½ÐµÐ½Ð¸Ñ Ð¿Ð»Ð¾ÑÐºÐ¾Ð¹ Ð²Ð¾Ð·Ð´ÑÑÐ½Ð¾Ð¹ ÑÑÑÑÐ¸ Ð² Ð¾Ð³ÑÐ°Ð½Ð¸ÑÐµÐ½Ð½Ð¾Ð¼ Ð¿ÑÐ¾ÑÑÑÐ°Ð½ÑÑÐ²Ðµ (Ð¿Ð¾Ð»Ð¾ÑÑÐ¸). ÐÐ½Ð°ÑÐµÐ½Ð¸Ñ ÑÐ¸ÑÐ»Ð° Ð ÐµÐ¹Ð½Ð¾Ð»ÑÐ´ÑÐ°, Ð²ÑÑÐ¸ÑÐ»ÐµÐ½Ð½ÑÐµ Ð¿Ð¾ Ð²ÑÑÐ¾ÑÐµ Ð¿ÑÐ¸ÑÐ¾ÑÐ½Ð¾Ð³Ð¾ ÑÐ¾Ð¿Ð»Ð° Ð¸ ÑÐºÐ¾ÑÐ¾ÑÑÐ¸ Ð¿Ð¾Ð´Ð°ÑÐ¸ ÑÑÑÑÐ¸ ÑÐ¾ÑÑÐ°Ð²Ð»ÑÑÑ Ð¾Ñ 2Ã10^3 Ð´Ð¾ 8Ã10^3. ÐÐ¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ ÑÑÑÐ±ÑÐ»ÐµÐ½ÑÐ½Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ Ð¾ÑÑÑÐµÑÑÐ²Ð»ÑÐµÑÑÑ Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð´Ð²ÑÑ Ð¿Ð¾Ð´ÑÐ¾Ð´Ð¾Ð²: URANS Ð¿Ð¾Ð´ÑÐ¾Ð´ (ÑÐµÑÐµÐ½Ð¸Ðµ Ð¾ÑÑÐµÐ´Ð½ÐµÐ½Ð½ÑÑ Ð¿Ð¾ Ð ÐµÐ¹Ð½Ð¾Ð»ÑÐ´ÑÑ ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ð¹ ÐÐ°Ð²ÑÐµ-Ð¡ÑÐ¾ÐºÑÐ°) Ð¸ LES Ð¿Ð¾Ð´ÑÐ¾Ð´ (ÑÐµÑÐµÐ½Ð¸Ðµ Ð¾ÑÑÐ¸Ð»ÑÑÑÐ¾Ð²Ð°Ð½Ð½ÑÑ ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ð¹ ÐÐ°Ð²ÑÐµ-Ð¡ÑÐ¾ÐºÑÐ°). Ð Ð°ÑÑÐµÑÑ Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ñ Ð² Ð¿Ð°ÐºÐµÑÐµ ANSYS Fluent. ÐÐ´Ð½Ð° Ð¸Ð· Ð¿Ð¾ÑÑÐ°Ð½Ð¾Ð²Ð¾Ðº Ð·Ð°Ð´Ð°Ñ, ÑÐ¾Ð¾ÑÐ²ÐµÑÑÑÐ²ÑÐµÑ ÑÑÐ»Ð¾Ð²Ð¸ÑÐ¼ ÑÐºÑÐ¿ÐµÑÐ¸Ð¼ÐµÐ½ÑÐ° A. Mataoui 2001 Ð³Ð¾Ð´Ð°. ÐÐ¾Ð´ÑÐ²ÐµÑÐ¶Ð´ÐµÐ½Ð¾ Ð½Ð°Ð±Ð»ÑÐ´Ð°Ð²ÑÐµÐµÑÑ ÑÐ°Ð½ÐµÐµ Ð² ÑÐºÑÐ¿ÐµÑÐ¸Ð¼ÐµÐ½ÑÐµ ÑÐ¾ÑÐ¼Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð°Ð²ÑÐ¾ÐºÐ¾Ð»ÐµÐ±Ð°ÑÐµÐ»ÑÐ½Ð¾Ð³Ð¾ ÑÐµÐ¶Ð¸Ð¼Ð° ÑÐµÑÐµÐ½Ð¸Ñ: Ð´Ð»Ñ ÑÐ°ÑÑÐ¼Ð°ÑÑÐ¸Ð²Ð°ÐµÐ¼Ð¾Ð³Ð¾ Ð¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð¸Ñ ÑÐµÐ»ÐµÐ²Ð¾Ð³Ð¾ ÑÐ¾Ð¿Ð»Ð° ÑÑÑÑÑ Ð¿Ð¾Ð¾ÑÐµÑÐµÐ´Ð½Ð¾ Ð¾ÑÐºÐ»Ð¾Ð½ÑÐµÑÑÑ Ðº Ð²ÐµÑÑÐ½ÐµÐ¹ Ð¸ Ð½Ð¸Ð¶Ð½ÐµÐ¹ ÑÑÐµÐ½ÐºÐ°Ð¼ Ð¿Ð¾Ð»Ð¾ÑÑÐ¸. Ð§Ð°ÑÑÐ¾ÑÑ Ð¸ Ð°Ð¼Ð¿Ð»Ð¸ÑÑÐ´Ñ ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ð¹ ÑÑÑÑÐ¸, Ð¿Ð¾Ð»ÑÑÐµÐ½Ð½ÑÐµ Ñ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸ÐµÐ¼ URANS Ð¸ LES Ð¿Ð¾Ð´ÑÐ¾Ð´Ð¾Ð², ÑÐ¾ÑÐ¾ÑÐ¾ ÑÐ¾Ð³Ð»Ð°ÑÑÑÑÑÑ Ñ Ð´Ð°Ð½Ð½ÑÐ¼Ð¸ ÑÐºÑÐ¿ÐµÑÐ¸Ð¼ÐµÐ½ÑÐ°. ÐÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð° Ð¾ÑÐµÐ½ÐºÐ° Ð²Ð»Ð¸ÑÐ½Ð¸Ñ Ð²ÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½ÑÑ Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÐ¾Ð² Ð·Ð°Ð´Ð°ÑÐ¸ Ð½Ð° ÑÑÑÑÐºÑÑÑÑ ÑÐ¾ÑÐ¼Ð¸ÑÑÐµÐ¼Ð¾Ð³Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ: ÑÐ°ÑÑÐ¾ÑÑ ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ð¹ Ð¸ Ð°Ð¼Ð¿Ð»Ð¸ÑÑÐ´Ñ ÑÐºÐ¾ÑÐ¾ÑÑÐ¸ Ð² ÑÐ¾ÑÐºÐ°Ñ Ð¼Ð¾Ð½Ð¸ÑÐ¾ÑÐ¸Ð½Ð³Ð°, Ð¾ÑÑÐµÐ´Ð½ÐµÐ½Ð½ÑÐµ Ð¿Ð¾Ð»Ñ ÑÐºÐ¾ÑÐ¾ÑÑÐ¸ Ð¸ ÑÐ°ÑÐ°ÐºÑÐµÑÐ¸ÑÑÐ¸Ðº ÑÑÑÐ±ÑÐ»ÐµÐ½ÑÐ½Ð¾ÑÑÐ¸. ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð»Ð°ÑÑ ÑÑÐ²ÑÑÐ²Ð¸ÑÐµÐ»ÑÐ½Ð¾ÑÑÑ ÑÐµÑÐµÐ½Ð¸Ñ Ðº Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ ÐºÐ¾Ð»Ð¸ÑÐµÑÑÐ²Ð° ÑÑÐµÐµÐº ÑÐ°ÑÑÐµÑÐ½Ð¾Ð¹ Ð¾Ð±Ð»Ð°ÑÑÐ¸, Ð¸ÑÐ¿Ð¾Ð»ÑÐ·ÑÐµÐ¼Ð¾Ð¹ Ð¼Ð¾Ð´ÐµÐ»Ð¸ ÑÑÑÐ±ÑÐ»ÐµÐ½ÑÐ½Ð¾ÑÑÐ¸ (Ð² URANS ÑÐ°ÑÑÐµÑÐ°Ñ) Ð¸ Ð¿Ð¾Ð´ÑÐµÑÐ¾ÑÐ½Ð¾Ð¹ Ð²ÑÐ·ÐºÐ¾ÑÑÐ¸ (Ð² LES ÑÐ°ÑÑÐµÑÐ°Ñ), ÑÐ¸ÑÐ¸Ð½Ñ ÑÐ°ÑÑÐµÑÐ½Ð¾Ð¹ Ð¾Ð±Ð»Ð°ÑÑÐ¸ Ð¸ ÑÑÐ»Ð¾Ð²Ð¸Ñ Ð½Ð° Ð±Ð¾ÐºÐ¾Ð²ÑÑ Ð³ÑÐ°Ð½Ð¸ÑÐ°Ñ Ð¿Ð¾Ð»Ð¾ÑÑÐ¸. ÐÐ±ÑÑÐ¶Ð´Ð°ÑÑÑÑ ÑÐ¿Ð¾ÑÐ¾Ð±Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸ÑÐ¼Ð¸ ÑÑÑÑÐ¸, ÑÐ°ÑÐ¿ÑÐ¾ÑÑÑÐ°Ð½ÑÑÑÐµÐ¹ÑÑ Ð² Ð¾Ð³ÑÐ°Ð½Ð¸ÑÐµÐ½Ð½Ð¾Ð¼ Ð¿ÑÐ¾ÑÑÑÐ°Ð½ÑÑÐ²Ðµ. ÐÐ¾ÐºÐ°Ð·Ð°Ð½Ð¾, ÑÑÐ¾ Ñ ÑÐ²ÐµÐ»Ð¸ÑÐµÐ½Ð¸ÐµÐ¼ Ð²ÑÑÐ¾ÑÑ Ð¿Ð¾Ð»Ð¾ÑÑÐ¸ ÑÐ°ÑÑÐ¾ÑÐ° ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ð¹ ÑÐ¼ÐµÐ½ÑÑÐ°ÐµÑÑÑ Ð¸ ÐºÑÑÐ¿Ð½Ð¾Ð¼Ð°ÑÑÑÐ°Ð±Ð½ÑÐµ ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ñ ÑÑÑÑÐ¸ Ð·Ð°ÑÑÑÐ°ÑÑ. ÐÐ¾Ð»ÑÑÐµÐ½Ð¾, ÑÑÐ¾ Ñ ÑÐ²ÐµÐ»Ð¸ÑÐµÐ½Ð¸ÐµÐ¼ ÑÐºÐ¾ÑÐ¾ÑÑÐ¸ Ð¿Ð¾Ð´Ð°ÑÐ¸ ÑÑÑÑÐ¸ ÑÐ°ÑÑÐ¾ÑÐ° ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ð¹ Ð»Ð¸Ð½ÐµÐ¹Ð½Ð¾ ÑÐ²ÐµÐ»Ð¸ÑÐ¸Ð²Ð°ÐµÑÑÑ, Ð¿ÑÐ¸ ÑÑÐ¾Ð¼ Ð·Ð½Ð°ÑÐµÐ½Ð¸Ðµ ÑÐ¸ÑÐ»Ð° Ð¡ÑÑÑÑÐ°Ð»Ñ ÑÐ¾ÑÑÐ°Ð½ÑÐµÑÑÑ. Ð£Ð¼ÐµÐ½ÑÑÐµÐ½Ð¸Ðµ ÑÐ°Ð·Ð¼ÐµÑÐ° Ð¾ÑÐºÑÑÑÐ¾Ð¹ Ð³ÑÐ°Ð½Ð¸ÑÑ Ð¿Ð¾Ð»Ð¾ÑÑÐ¸ Ð¿ÑÐ¸Ð²Ð¾Ð´Ð¸Ñ Ðº ÑÐ¼ÐµÐ½ÑÑÐµÐ½Ð¸Ñ ÑÐ°ÑÑÐ¾ÑÑ Ð¸ Ð°Ð¼Ð¿Ð»Ð¸ÑÑÐ´Ñ ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ð¹ ÑÐºÐ¾ÑÐ¾ÑÑÐ¸. ÐÐ¾ÐºÐ°Ð·Ð°Ð½Ð¾, ÑÑÐ¾ ÐºÑÑÐ¿Ð½Ð¾Ð¼Ð°ÑÑÑÐ°Ð±Ð½ÑÐµ ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ñ ÑÑÑÑÐ¸ ÑÐ¾ÑÐ¼Ð¸ÑÑÑÑÑÑ Ð¿ÑÐ¸ ÑÑÐ»Ð¾Ð²Ð¸Ð¸, ÑÑÐ¾ ÑÐ¾ÑÑÐµÐ²Ð°Ñ Ð³ÑÐ°Ð½Ð¸ÑÐ° Ð¿Ð¾Ð»Ð¾ÑÑÐ¸ Ð¾ÑÐºÑÑÑÐ° Ð±Ð¾Ð»ÐµÐµ ÑÐµÐ¼ Ð½Ð° 50%.
description: The thesis presents a numerical study of a plane jet propagated in a confined space (cavity). The Reynolds numbers, computed based on the height of the inlet nozzle and jet velocity, is in the range from 2Ã10^3 to 8Ã10^3. Turbulent airflow modeling is carried out based on two approaches: the URANS approach (the Reynolds-averaged Navier-Stokes equations solution) and LES approach (the filtered Navier-Stokes equations solution). The calculations are performed using ANSYS Fluent software package. One of the problem formulations corresponds to the experimental conditions of A. Mataoui 2001. The formation of self-oscillatory airflow regime, previously observed in the experimental study, is confirmed. For the considered position of the inlet nozzle, the jet alternately deflects towards the upper and lower walls of the cavity. Frequencies and amplitudes of the jet oscillations obtained with the URANS and LES approaches are in good agreement with the experimental data. The influence of computational parameters on the airflow structure (frequency and amplitude of oscillation, averaged fields of velocity and turbulence characteristics) was evaluated. Sensitivity of the solution to the mesh cells number of the computational domain, turbulence model (in URANS calculations), subgrid viscosity (in LES calculations), and the width of the computational domain were investigated. Methods of controlling jet oscillations in confined spaces are discussed. It is shown that the increase in cavity height leads to a decrease in oscillation frequency and damping of large-scale oscillations. It is also found that the jet velocity growth increases the oscillation frequency while preserving the Strouhal number. Reduction in the size of the open cavity boundary leads to a decrease in oscillation frequency and amplitude. It is shown that large-scale jet oscillations are formed when the open cavity boundary is more than 50% from that side boundary.