Eventos Anais de eventos
EPTT 2024
14th Spring School on Transition and Turbulence
ON THE FORMATION OF A LAMINAR SEPARATION BUBBLE
Submission Author:
Igor Braga de Paula , RJ , Brazil
Co-Authors:
omar elias horna pinedo, Igor Braga de Paula
Presenter: omar elias horna pinedo
doi://10.26678/ABCM.EPTT2024.EPT24-0054
Abstract
The formation of a laminar separation bubble on a flat plate (LSB) was experimentally studied from the beginning of the laminar separation until the bubble reached its quasi-stationary regime. The experiments were carried out in a low-turbulence, closed-return water channel. The pressure gradient was imposed by a false wall, which created a convergent-divergent channel. The bubble was formed in the divergent part corresponding to the adverse pressure gradient region. A vibration ribbon located upstream of the LSB introduced controlled disturbances into the boundary layer. Velocity fields were measured using the two-dimensional time-resolved particle image velocimetry technique (TR-PIV). Phase-locked and ensemble average schemes were used in data acquisition and post-processing respectively. The results show the bubble formation process in great detail, allowing us to characterize the main topological characteristics and some integral parameters. These results are original in the literature and can contribute to describe the bubble formation and its dynamics.
Keywords
Laminar separation bubble, Time Resolved Particle Image Velocimetry, reduced order models
