Formation Criterion for Axisymmetric Synthetic Jets at High Stokes Numbers

Trávníček, Z.; Broučková, Zuzana; Kordík, Jozef

doi:10.2514/1.j051649

Cited by 40 publications

(23 citation statements)

References 43 publications

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“…Figure 4b shows in detail the range of 0 -0.2 W. It can be seen that with decreasing power the velocity of SJ decreases too. For very low power input, the SJ was weak and probably near the formation criterion [16,17]. Figure 5a shows a visualization of the flow around the cylinder at the regime of the von Kármán vortex street; Fig.…”

Section: Frequency and Power Characteristicsmentioning

confidence: 99%

Active control of the wake behind the cylinder

et al. 2017

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Abstract. Active control of the flow around a circular cylinder using a synthetic jet (SJ) array was experimentally investigated in a small wind tunnel. The prevailing method was flow visualization. Modification of the wake was investigated at two values of a dimensionless momentum coefficient (C ȝ = 0.21 and 1.02). Various Į and C f parameters were tested (where Į is the angle between SJs and the main flow direction and C f is the frequency ratio). It was found that the control moves a separation point more downstream, i.e. the width of the wake can be reduced. Moreover, increasing frequency ratio C f causes refining of the vortex structure. When the SJs are placed at the front or rear stagnation points, the wake tends towards the symmetrical pattern.

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Section: Frequency and Power Characteristicsmentioning

confidence: 99%

Active control of the wake behind the cylinder

et al. 2017

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“…As an example of experimental study can be mentioned reference [2]. There is also included extensive literature review in the mentioned reference.…”

Section: Existence Of Synthetic Jetmentioning

confidence: 99%

“…[1,2]. Velocity scale is defined as time averaged blowing orifice centerline velocity over an entire cycle…”

Section: Parameters Of Synthetic Jetsmentioning

confidence: 99%

Modal Decomposition of Synthetic Jet Flow Based on CFD Computation

Hyhlík

Netřebská

2015

EPJ Web of Conferences

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Abstract. The article analyzes results of numerical simulation of synthetic jet flow using modal decomposition. The analyzes are based on the numerical simulation of axisymmetric unsteady laminar flow obtained using ANSYS Fluent CFD code. Three typical laminar regimes are compared from the point of view of modal decomposition. The first regime is without synthetic jet creation with Reynolds number Re = 76 and Stokes number S = 19.7. The second studied regime is defined by Re = 145 and S = 19.7. The third regime of synthetic jet work is regime with Re = 329 and S = 19.7. Modal decomposition of obtained flow fields is done using proper orthogonal decomposition (POD) where energetically most important modes are identified. The structure of POD modes is discussed together with classical approach based on phase averaged velocities.

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“…The most commonly used parameters of the synthetic jet are based on so-called slug model, see e.g. [3,4]. Velocity scale is defined as time averaged blowing orifice centerline velocity over an entire cycle…”

Section: Introductionmentioning

confidence: 99%

Analysis of turbulent synthetic jet by dynamic mode decomposition

et al. 2017

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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.

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Formation Criterion for Axisymmetric Synthetic Jets at High Stokes Numbers

Cited by 40 publications

References 43 publications

Active control of the wake behind the cylinder

Active control of the wake behind the cylinder

Modal Decomposition of Synthetic Jet Flow Based on CFD Computation

Analysis of turbulent synthetic jet by dynamic mode decomposition

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