Interaction of a synthetic jet with a flat plate boundary layer

Mittal, Rajat; Rampunggoon, P.; Udaykumar, H. S.

doi:10.2514/6.2001-2773

Cited by 104 publications

(68 citation statements)

References 14 publications

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“…Chen et al [4] and Davis and Glezer [6] have presented the mixing enhancement for the active control of separation and turbulence in the boundary layer (see also Smith and Glezer [15], and Crook et al [5]). Mittal et al [12] studied the performance of a synthetic jet actuator, based on a number of geometrical, structural and flow parameters. Amitay et al [1] demonstrated the usage of synthetic jets in delaying separation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Synthetic Jet with OpenFOAM

Liu

Kazakidi

Medeiros

et al. 2015

Fluid Mechanics and Its Applications

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Numerical simulations of flow surrounding a synthetic jet actuating device are presented. By modifying a dynamic mesh technique available in OpenFOAM,a well-documented open-source solver for fluid dynamics, detailed computations of the sinusoidal motion of the synthetic jet diaphragm were possible. Numerical solutions were obtained by solving the two dimensional incompressible viscous N-S equations, with the use of a second order implicit time marching scheme and a central finite volume method for spatial discretization in both streamwise and crossflow directions. A systematic parameter study is reported here, in which the external Reynolds number, the diaphragm amplitude and frequency, and the slot dimensions are varied.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of a Synthetic Jet with OpenFOAM

Liu

Kazakidi

Medeiros

et al. 2015

Fluid Mechanics and Its Applications

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show abstract

“…In developing synthetic jet actuators (SJAs) for active flow control, extensive work has been conducted on numerical modeling of the synthetic jet generated in a quiescent external flow condition (in the absence of a cross flow) [ [11], [14], [17], [25]]. In this numerical modeling, the neighborhood of the jet exit was simulated.…”

Section: Introductionmentioning

confidence: 99%

“…They also investigated various jets, laminar and turbulent, pulsed and steady, and achieved very good agreement between the numerical simulation and the experimental measurement. The models in [[14], [17], [25]] included the flow behavior in the cavity of the actuator and simulated not only the jets generated but also the compression/intake and expansion/discharging processes in the cavity.…”

Section: Introductionmentioning

confidence: 99%

“…The turbulence models and solvers used in simulating the synthetic jets in a quiescent condition include a two-dimensional incompressible flow model with Reynolds-averaged Navier-Stokes (RANS) [[11]] or Direct Numerical Simulation (DNS) [ [17]], and three-dimensional model with DNS [ [21]]. In the 2-D simulation of separation control over an airfoil using synthetic jets, unsteady RANS [ [2]] and hybrid RANS/LES derived from combining the best features of RANS and LES [ [20]] have been used.…”

Section: Introductionmentioning

confidence: 99%

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LES of synthetic jets in boundary layer with laminar separation caused by adverse pressure gradient

2010

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In the development of synthetic jet actuators (SJAs) for active flow control, numerical simulation has played an important role. In controlling the boundary layer flow separation, an integrated numerical model which includes both the baseline flow and the SJA is still in its initial stage of development. This paper reports preliminary results of simulating the interaction between a synthetic jet and a laminar separation bubble caused by adverse pressure gradient in a boundary layer. The computational domain was three-dimensional and Large-eddy simulation (LES) was adopted. The initial and boundary conditions were defined using or referring to our wind tunnel experimental results. Prior to numerically simulating the interaction between the synthetic jets and the baseline flow, a numerical model for simulating the separation bubble was developed and verified. In the numerical model including the SJA, the synthetic jet velocity at the exit of the SJA was defined as an input. The numerical model was further verified by comparing the simulation with experimental results. Based on reasonable agreement between the numerical and experimental results, simulations were carried out to investigate the dependency of flow control using synthetic jets on the forcing frequency, focused on the lower frequency range of the Tollmien-Schlichting (T-S) instability, and on the forcing amplitude which was represented by the maximum jet velocity at the exit of the SJA. Supporting the hypothesis based on the 1 experiment, LES results showed that the forcing frequency had stronger influence on SJA's effective elimination of the separation bubble than the forcing amplitude did.Key words: synthetic jet actuator, micro sensor, numerical modeling, flow control.

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“…Furthermore, synthetic jets have been found to achieve similar effectiveness to steady blowing or suction with considerably smaller momentum (and hence lower energy inputs). 1 The problem of synthetic jet flow in a turbulent boundary layer has been studied both experimentally (see, for example [2][3][4][5] ) and computationally (see, for example [6][7][8][9][10][11] ). Earlier numerical work by Rizzetta et al 12 for synthetic jets into quiescent flow demonstrated that accounting for the internal actuator geometry was important because it affected the jet profiles at the exit.…”

Section: Introductionmentioning

confidence: 99%

Time-accurate computations of isolated circular synthetic jets in crossflow

et al. 2007

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Results from unsteady Reynolds-averaged Navier-Stokes computations are described for two different synthetic jet flows issuing into a turbulent boundary layer crossflow through a circular orifice. In one case the jet effect is mostly contained within the boundary layer, while in the other case the jet effect extends beyond the boundary layer edge. Both cases have momentum flux ratios less than 2. Several numerical parameters are investigated, and some lessons learned regarding the CFD methods for computing these types of flow fields are outlined. Results in both cases are compared to experiment.

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Interaction of a synthetic jet with a flat plate boundary layer

Cited by 104 publications

References 14 publications

Numerical Simulation of a Synthetic Jet with OpenFOAM

Numerical Simulation of a Synthetic Jet with OpenFOAM

LES of synthetic jets in boundary layer with laminar separation caused by adverse pressure gradient

Time-accurate computations of isolated circular synthetic jets in crossflow

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