title: Ð§Ð¸ÑÐ»ÐµÐ½Ð½Ð¾Ðµ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð°Ð²ÑÐ¾ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ð¹ Ð² Ð¿ÑÑÐ¼Ð¾ÑÐ³Ð¾Ð»ÑÐ½Ð¾Ð¹ ÐºÐ°Ð²ÐµÑÐ½Ðµ Ñ ÑÑÐ°Ð½Ð·Ð¸ÑÐ½ÑÐ¼ Ð¿Ð¾ÑÐ¾ÐºÐ¾Ð¼
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 simulation of self-sustained oscillations arising from the flow of fluid over a rectangular cavity
Creators: name: ÐÐ¸Ð»ÐµÐ², ÐÐ¸ÐºÐ¾Ð»Ð°Ð¹
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: Ð¾ÑÐºÑÑÑÐ°Ñ ÐºÐ°Ð²ÐµÑÐ½Ð°
Ð°Ð²ÑÐ¾ÐºÐ¾Ð»ÐµÐ±Ð°Ð½Ð¸Ñ
ÑÐ¿ÐµÐºÑÑ ÑÐ°ÑÑÐ¾Ñ
ÑÐ¾Ð»ÑÐ¸Ð½Ð° Ð¿Ð¾ÑÐµÑÐ¸ Ð¸Ð¼Ð¿ÑÐ»ÑÑÐ°
ÑÐ¸ÑÐ»Ð¾ Ð ÐµÐ¹Ð½Ð¾Ð»ÑÐ´ÑÐ°
open cavity
self-sustained oscillations
frequency spectrum
momentum loss thickness
Reynolds number

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description: This work is dedicated to the study of self-sustained oscillations arising from the flow of fluid over a rectangular cavity. The tasks addressed during the study include: 1. Studying the mechanism of self-oscillation occurrence in an open cavity. 2. Conducting methodological calculations to investigate mesh convergence, the influence of time step size, etc. 3. Qualitative analysis of fluid flow over the open cavity. 4. Conducting parametric studies on the influence of the Reynolds number based on the cavity length and the Reynolds number based on the boundary layer momentum loss thickness on the frequency spectrum of self-sustained oscillations. A parametric study was conducted to visually show the influence of key flow parameters on the frequency spectrum of self-sustained oscillations. Numerical modeling was performed using the FLOS software package, developed at the Department of Fluid Dynamics of SPbPU. On average, calculations on a personal computer took 20-24 hours. Methodological calculations were carried out to investigate mesh convergence, the influence of boundary conditions, etc. A qualitative analysis of the flow was conducted, and vortex structures were identified. Two series of calculations were performed to investigate the influence of key flow parameters: in the first series, the Reynolds number based on the cavity length was varied, and in the second series, the Reynolds number based on the boundary layer momentum loss thickness was varied. Based on the conducted studies, conclusions were drawn that the Reynolds number practically does not affect the Strouhal number (dimensionless frequency) based on the cavity length. The Strouhal number depends only on the ratio of the cavity length to the boundary layer thickness.