Turbulent Boundary Layer Response to Active Control Actuator

Lozier, Mitchell; Thomas, Flint O.; Gordeyev, Stanislav

doi:10.2514/6.2021-1455

Cited by 3 publications

(3 citation statements)

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“…Their results support the existence of a critical layer inside the wake region that is responsible for the amplified level of turbulence in that region. Focusing on the perturbation within the outer region of the boundary layer, Lozier et al [23,24,25] introduced large-scale perturbations through a dielectric barrier discharge (DBD) plasma actuator and performed phase-locked decomposition to obtain synthetic large-scale structures and investigate their interactions with the residual turbulence.…”

Section: Introductionmentioning

confidence: 99%

“…Our analysis exploits the natural embedding of a wall-normal dependent phase speed to investigate the local convective velocity of the actuated large-scale structures. We focus on the particular problem of a low Reynolds number turbulent boundary layer where a synthetic large-scale structure is introduced through a spanwise-uniform DBD plasma actuator based on the experimental set-up in [23][24][25]. The effect of the plasma actuator is modeled as a streamwise body force associated with a dominant temporal frequency.…”

Section: Introductionmentioning

confidence: 99%

“…Temporally periodic perturbations over a wide range of frequencies that are injected at the wall [10, 11, 13, 17-21, 27, 33-35] and perturbations introduced in the outer layer [22][23][24][25], have been extensively studied. However, there have been few studies of the effect of varying the height and frequency of actuation of boundary layer.…”

Section: Introductionmentioning

confidence: 99%

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Spatial input-output analysis of large-scale structures in actuated turbulent boundary layers

Liu

Gluzman

Lozier

et al. 2022

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This paper develops a spatial input-output approach to investigate the dynamics of a turbulent boundary layer subject to a localized single frequency excitation. This method uses one-way spatial integration to reformulate the problem in terms of spatial evolution equations. The technique is used to examine the effect of localized periodic actuation at a given temporal frequency, based on an experimental set-up in which an active large-scale is introduced into the outer layer of a turbulent boundary layer. First, the large-scale structures associated with the phase-locked modal velocity field obtained from spatial input-output analysis are shown to closely match those computed based on hot-wire measurements. The approach is then used to further investigate the response of the boundary layer to the synthetically generated large-scale. A quadrant trajectory analysis indicates that the spatial input-output response produces shear stress distributions consistent with those in canonical wall-bounded turbulent flows in terms of both the order and types of events observed. The expected correspondence between the dominance of different quadrant behavior and actuation frequency is also observed. These results highlight the promise of a spatial input-output framework for analyzing the formation and streamwise evolution of structures in actuated wall-bounded turbulent flows. Nomenclature 𝑥 = streamwise location 𝑦 = wall-normal location 1 Graduate student, Department of Mechanical Engineering.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%