Simulation of Aeroelastic Mesoflaps for Shock/Boundary-Layer Interaction

Wood, Brett; Loth, Eric; Geubelle, Philippe H.

doi:10.1006/jfls.2002.0464

Cited by 15 publications

(6 citation statements)

References 13 publications

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“…On transonic airfoils, these smaller VGs have been shown experimentally to reduce shock strengths and delay shock-induced separation, with significantly reduced device drag when compared with the traditional VGs [9]. The potential of microdevices for supersonic inlet flow control has been investigated via various SBLI configurations [12][13][14][15]. In recent studies by Raghunathan [16] and Srinivasan et al [17], micro-VGs stand out for their potential in supersonic SBLIs in internal flows.…”

mentioning

confidence: 99%

Vortex Generators for a Normal Shock/Boundary Layer Interaction with a Downstream Diffuser

Rybalko

Babinsky

Loth

2012

Journal of Propulsion and Power

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Novel vortex generators for boundary-layer control were investigated experimentally in a flowfield that contains a Mach 1.4 normal shock wave followed by a subsonic diffuser. A parametric study of device height and distance upstream of the normal shock was undertaken with two previously untested devices: ramped vanes and split ramps. Flowfield diagnostics included high-speed schlieren, oil flow visualization, and pitot-static pressure measurements. A number of flowfield parameters including flow separation, pressure recovery, centerline incompressible boundarylayer shape factor, and shock stability were analyzed and compared with the baseline. All vortex generators tested yielded an elimination of centerline flow separation but also increased the three-dimensionality of the flow via increased sidewall interaction. When located 25 o upstream of the normal shock, the largest ramped-vane device (for which the height was about 0.75 of the incoming uncontrolled boundary-layer thickness o ) yielded the smallest centerline incompressible shape factor and the least streamwise oscillations of the normal shock. However, additional studies are needed to better understand the three-dimensional characteristics, especially the corner interaction effects. Nomenclature

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mentioning

confidence: 99%

Vortex Generators for a Normal Shock/Boundary Layer Interaction with a Downstream Diffuser

Rybalko

Babinsky

Loth

2012

Journal of Propulsion and Power

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“…In the case when the dynamics of the beam is considered and time-varying loads are accounted for, the governing equation is that of a vibrating beam , where [ ] K′ is the discrete fourth order differential operator for the entire beam, ρ is the density of the beam and A is the area of the beam per unit depth which is effectively equal to the height of the beam (t) in this case. The discretization of the temporal derivative for this problem is done using Newmark's average acceleration method [32] ( )…”

Section: Structural Solver: Beam Bending Equationsmentioning

confidence: 99%

“…• At every structural iteration, the maximum change in displacement of each mesoflap (compared to the previous configuration) is computed. • It is then checked whether this value is less than a specified tolerance, which is chosen as 10% of the flap thickness [32]. If this is true for all the mesoflaps then the fluidstructure interaction is assumed to be converged • A final fluid solution is obtained for the converged configuration of the mesoflap system.…”

Section: Fluid-structure Iterationmentioning

confidence: 99%

Hybrid LES/RANS Simulation of the Effects of Boundary Layer Control Devices Using Immersed Boundary Methods

Edwards¹

2010

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“…This includes use of devices like vortex generators (wedges, vanes, and doublets) 5, 7-9, 11 , aero-elastically deflecting flaps [2][3][4]10 , and jets 6 of fluids among other devices. A majority of the numerical simulations/experiments performed to investigate and design such devices have used idealized computational domains with periodic boundary conditions in the spanwise direction 2,7,8,11,13 / ignored effects of wind-tunnel sidewalls [3][4][5] in wind-tunnel test sections. As such, these studies have typically ignored the effects of the sidewall -which is present in an actual inletin determining the design of SBLI control device.…”

Section: Introductionmentioning

confidence: 99%

Flow Control in a Mach 4.0 Inlet by Slotted Wedge-shaped Vortex Generators

Varma

Saurav

Ghosh

2015

33rd AIAA Applied Aerodynamics Conference

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This work investigates the effectiveness of a relatively novel flow control device, the slotted vortex generator, in mitigation of shock-induced flow separation in a realistic mixedcompression inlet geometry. The presence of sidewalls in an actual inlet makes the interactions between the oblique shocks and the boundary layers highly three dimensional. As such the flow separation and its control in a real inlet is more involved than that investigated based on notions of a primarily 2-D separation region. This work makes an attempt to determine an effective streamwise and spanwise arrangement of vortex generators in an actual inlet to minimize the flow separation. The inlet considered for the simulations are based on the experiments conducted by Emami and co-workers at NASA Glenn research center at Mach 4.03 to determine performance of an inlet/isolator configuration. The present work uses a computational domain for one such inlet configuration -having the smallest sized cowl -and a large convergence angle to produce a strong cowl lip shock. The computations performed are computed using the REACTMB code suitable for high-speed turbulent flows. The turbulence model used is Menter's SST model.

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Simulation of Aeroelastic Mesoflaps for Shock/Boundary-Layer Interaction

Cited by 15 publications

References 13 publications

Vortex Generators for a Normal Shock/Boundary Layer Interaction with a Downstream Diffuser

Vortex Generators for a Normal Shock/Boundary Layer Interaction with a Downstream Diffuser

Hybrid LES/RANS Simulation of the Effects of Boundary Layer Control Devices Using Immersed Boundary Methods

Flow Control in a Mach 4.0 Inlet by Slotted Wedge-shaped Vortex Generators

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