Open AccessМетастабильные отрывные структуры при турбулентном обтекании круглых и овальных лунок
Author(s) -
С.В. Гувернюк,
А.Ю. Чулюнин
Publication year - 2019
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2019.17.48224.17887
Subject(s) - dimple , vortex , turbulence , mechanics , flow (mathematics) , physics , geometry , materials science , geology , mathematics , composite material
At present paper, mechanisms which determine turbulent separated flow structures inside oval-trench dimples are described. In cases of short trenches, includes the semi-spherical dimple, three regimes exist: symmetrical and two mono-core asymmetrical. It should be noted, asymmetrical regimes are metastable, while the symmetrical regime is unstable. Therefore, for short dimples, an actual flow pattern has an unsteady nature, which is characterized by switching between two mono-cores vortex structures. With an increase in the length of dimples, the symmetrical regime becomes a stable and an actual flow pattern has a quasi-steady character. Further increase of dimple's length produces more complex flow topology with persisting of the quasi-steady nature.