Numerical studies of undulation control on dynamic stall for reverse flows

Wang, Biao; Liu, Jian; Yang, Yongrong; Xiao, Zhixiang

doi:10.1007/s10409-020-00950-7

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…The length scale of DDES is given as (Wang et al. 2020) where l RANS and l LES are the length scales of RANS and LES, respectively, and with C DES the model constant and the maximum edge length of the cell. Particularly, the DDES based on the shear-stress transport (SST) model was used in this study.…”

Section: Methodsmentioning

confidence: 99%

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Dynamics of the interaction of synthetic jet vortex rings with a stratified interface

Wang

Feng

2022

J. Fluid Mech.

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The vortex dynamics in a stratified environment is of fundamental importance in various flow systems, however, the mechanism of successive vortex–interface interactions remains not fully understood. This study investigates synthetic jet vortex rings impinging on a water–oil interface by experiment and numerical simulation. Two cases in the laminar and transitional regimes are concerned with the Froude number (Fr) of 0.35 and 0.82, respectively. The vortex rings for the two cases follow a similar evolution with three distinct stages, including vortex free-travel, vortex–interface interaction and vortex stretching. As products of the vortex–interface interaction, the secondary vortex rings are baroclinically generated in both water and oil followed by the formation of hairpin vortices through azimuthal deformation. Distinguished from an isolated vortex–interface interaction, complex interactions occur between the primary vortex ring and hairpin vortices, which can enhance the vortex ring instability in existence of the stratification for the laminar case. However, the vortex ring instability for the transitional case can develop earlier due to nonlinear effects with increasing Reynolds number. The spatio-temporal properties of the interface deformation and interfacial waves are analysed. The maximum penetration height of vortex rings scales with Fr2 as that for the isolated situation. Particularly, the transitional case is found to produce destabilization of the interfacial waves at a further radial location. The mechanism is revealed by connecting the dynamics of the vortex and the interface, which can be attributed to the radial development of perturbances stemming from the vortex ring instability under strong vortex–interface interaction.

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Section: Methodsmentioning

confidence: 99%

“…Here, f d approximates to 1 in the LES region and falls to 0 in the RANS region. The length scale of DDES is given as (Wang et al 2020)…”

Section: Computational Modelmentioning

confidence: 99%

Dynamics of the interaction of synthetic jet vortex rings with a stratified interface

Wang

Feng

2022

J. Fluid Mech.

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“…Zhang et al [2] reported an experimental investigation to apply a leading-edge protuberance technology to control the fluctuations of the unsteady aerodynamic loads acting on a dynamically-pitching wind turbine airfoil. Wang et al [3] presented a numerical study to use a leading-edge undulation control method to suppress the dynamic stall over the surface of a wind turbine airfoil model.…”

Section: Prefacementioning

confidence: 99%

“…The other three research papers devote to numerical simulations. Wang et al [3] reported their numerical simulation results to examine the effects of undulation control on dynamic stall of a wind turbine airfoil/blade model. Ye et al [5] presented a numerical study to quantify the unsteady aerodynamics characteristics of a horizontal wind turbine under yawed and dynamic yawing conditions.…”

Section: Prefacementioning

confidence: 99%