Abstract
Dynamics of the flow-field behind a backward-facing step in a narrow channel is studied experimentally using time resolved PIV technique. Secondary flow represented by vortical structures is studied using Oscillation Pattern decomposition technique. The low-frequency quasi-periodical structures appearing in the region just behind the step close to the channel bottom are studied. Typical dynamics of vortex structures involving contra-rotating vortex pair train, vortices coalescence and splitting have been observed.
Highlights
A back-facing step configuration of a channel occurs in many engineering applications ranging from various fluidic elements, cooling of turbine blades, airconditioning pipelines to many other devices
The backward facing step flow has been established as a benchmark configuration for separated flow studies in fluid mechanics
EPJ Web of Conferences existence of vortical structures impinging on the wall and description of theirs dynamical behaviour
Summary
A back-facing step configuration of a channel occurs in many engineering applications ranging from various fluidic elements, cooling of turbine blades, airconditioning pipelines to many other devices. Flow separation on the step edge is a source of pressure loss, vibrations, and noise and affects heat transfer. This flow belongs to the complex-flow family defined in the pioneering paper by Bradshaw [1]. The dynamical behaviour of the flow-field is studied in details. The kidney pattern showed up just behind the step, and back-flow region is located with distinct influence of secondary structures close to the channel walls. EPJ Web of Conferences existence of vortical structures impinging on the wall and description of theirs dynamical behaviour. This issue has not been addressed in available literature yet
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
