A Vortex-based Fluidic Oscillator is a novel device that harnesses fluid dynamics to create self-sustained oscillations without moving parts. This intriguing mechanism comprises a primary and secondary chamber, separated by a mid-throat and linked by feedback channels. As fluid enters the system, it forms intricate vortex pairs within both chambers. These vortices interact with the jet’s shear layer, gradually disrupting its symmetry and triggering a harmonic oscillation through the feedback flow. The oscillating jet’s collision with the mid-throat creates a powerful vortex in the primary chamber, redirecting the flow. Meanwhile, vortex formation in the secondary chamber causes the jet to adhere to one side, resulting in a deflected outlet stream. Now, regarding the reference paper entitled “ Design of a novel vortex-based feedback fluidic oscillator with numerical evaluation”, a fantastic CFD study is conducted.

Figure 1: Conventional Fluidic Oscillator schematic

Simulation Process

Initially, the fluidic oscillator model is designed by means of construction points in Gambit software. It was then transferred into Design Modeler for further modifications. The mesh generation step is of the essence. Employing multi-regional structure along with virtual topology option, a structured grid produced established from 67400 cells. The novel design lets the water experience oscillations with any moving parts. Last but not least, this is a time-dependent simulation (transient).

Figure 2: Structured grid produced by ANSYS Meshing

Post-processing

The simulation of a Vortex-based Fluidic Oscillator reveals fascinating fluid dynamics at play, as depicted in the velocity contour image. The nozzle outlet exhibits a peak velocity of 17.24 m/s, initiating a complex flow pattern downstream. The contour illustrates the formation of distinct vortices within the primary and secondary chambers, characterized by regions of varying velocities. The jet’s interaction with these chambers creates a mesmerizing display of fluid motion, with high-velocity streams (yellow and green areas) going through lower-velocity zones (blue regions). This flow behavior demonstrates the oscillator’s ability to generate self-sustained oscillations without moving parts, showcasing its potential for applications in mixing, flow control, and atomization processes.