Abstract
The article deals with the analysis of CFD results of the turbulent synthetic jet. The numerical simulation of Large Eddy Simulation (LES) using commercial solver ANSYS CFX has been performed. The unsteady flow field is studied from the point of view of identification of the moving vortex ring, which has been identified both on the snapshots of flow field using swirling-strength criterion and using the Dynamic Mode Decomposition (DMD) of five periods. It is shown that travelling vortex ring vanishes due to interaction with vortex structures in the synthesised turbulent jet. DMD modes with multiple of the basic frequency of synthetic jet, which are connected with travelling vortex structure, have largest DMD amplitudes.
Highlights
This work can be understood as a continuation of previous works dealt with modal decomposition and analysis of synthetic jets, see e.g. works [1, 2].The existence of synthetic jet is related to vortex ring creation
There are vortex structures in the right part of the figure 1 connected with the turbulent jet which is created by travelling vortex ring
The goal of Dynamic Mode Decomposition (DMD) is the extraction of dynamic characteristics such as eigenvalues and eigenvectors which are described by linear operator A based on sequence V1N
Summary
This work can be understood as a continuation of previous works dealt with modal decomposition and analysis of synthetic jets, see e.g. works [1, 2].The existence of synthetic jet is related to vortex ring creation. Reynolds number can be determined using time averaged blowing orifice centerline velocity U0 as where D is orifice diameter and ν is kinematic viscosity. The simulation is run for 65 periods to get the developed flow field. The vortex ring created in the blowing part of the period is very stable structure because it is not possible to see its spontaneous brake up.
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