Control of transitional shock wave boundary layer interaction using structurally constrained surface morphing

Shinde, Vilas; McNamara, Jack J.; Gaitonde, Datta V.

doi:10.1016/j.ast.2019.105545

Cited by 27 publications

(10 citation statements)

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“…For both concepts the authors performed simulations with coupled fluidstructure interaction (FSI) as well as wind tunnel measurements. Similar simulations using FSI have been performed by Gramola et al [82,83] and Shinde et al [84,85].…”

Section: Thin Flexible Platesupporting

confidence: 65%

Review of Adaptive Shock Control Systems

et al. 2021

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Drag reduction plays a major role in future aircraft design in order to lower emissions in aviation. In transonic flight, the transonic shock induces wave drag and thus increases the overall aircraft drag and hence emissions. In the past decades, shock control has been investigated intensively from an aerodynamic point of view and has proven its efficacy in terms of reducing wave drag. Furthermore, a number of concepts for shock control bumps (SCBs) that can adapt their position and height have been introduced. The implementation of adaptive SCBs requires a trade-off between aerodynamic benefits, system complexity and overall robustness. The challenge is to find a system with low complexity which still generates sufficient aerodynamic improvement to attain an overall system benefit. The objectives of this paper are to summarize adaptive concepts for shock control, and to evaluate and compare them in terms of their advantages and challenges of their system integrity so as to offer a basis for robust comparisons. The investigated concepts include different actuation systems as conventional spoiler actuators, shape memory alloys (SMAs) or pressurized elements. Near-term applications are seen for spoiler actuator concepts while highest controllability is identified for concepts several with smaller actuators such as SMAs.

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Section: Thin Flexible Platesupporting

confidence: 65%

Review of Adaptive Shock Control Systems

et al. 2021

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“…The Lagrangian modes that correspond to the domain deformation, (LPOD) and (LDMD), precisely indicate the regions of the flow that are affected by the bottom surface deflection. This is of significant practical importance for the flow control using surface morphing (Bruce & Colliss 2015; Shinde, McNamara & Gaitonde 2020; Shinde, Gaitonde & McNamara 2021), where the effect of control surface deformation on the flow fields can be identified using LMA for the efficacy of control.…”

Section: Resultsmentioning

confidence: 99%

Lagrangian approach for modal analysis of fluid flows

Shinde

Gaitonde

2021

J. Fluid Mech.

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Common modal decomposition techniques for flow-field analysis, data-driven modelling and flow control, such as proper orthogonal decomposition and dynamic mode decomposition, are usually performed in an Eulerian (fixed) frame of reference with snapshots from measurements or evolution equations. The Eulerian description poses some difficulties, however, when the domain or the mesh deforms with time as, for example, in fluid–structure interactions. For such cases, we first formulate a Lagrangian modal analysis (LMA) ansatz by a posteriori transforming the Eulerian flow fields into Lagrangian flow maps through an orientation and measure-preserving domain diffeomorphism. The development is then verified for Lagrangian variants of proper orthogonal decomposition and dynamic mode decomposition using direct numerical simulations of two canonical flow configurations at Mach 0.5, i.e. the lid-driven cavity and flow past a cylinder, representing internal and external flows, respectively, at pre- and post-bifurcation Reynolds numbers. The LMA is demonstrated for several situations encompassing unsteady flow without and with boundary and mesh deformation as well as non-uniform base flows that are steady in Eulerian but not in Lagrangian frames. We show that application of LMA to steady non-uniform base flow yields insights into flow stability and post-bifurcation dynamics. LMA naturally leads to Lagrangian coherent flow structures and connections with finite-time Lyapunov exponents. We examine the mathematical link between finite-time Lyapunov exponents and LMA by considering a double-gyre flow pattern. Dynamically important flow features in the Lagrangian sense are recovered by performing LMA with forward and backward (adjoint) time procedures.

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“…The spatial derivative terms are discretized using a 6th-order compact central finite difference scheme, ensuring no dissipation error on uniform meshes. A small value of artificial damping is added for numerical stability, similar to Shinde et al [28,29]. Detailed validation studies may be found in Visbal and Gaitonde [30], Gaitonde and Visbal [31], Visbal and Gaitonde [32], and Garmann [33].…”

Section: Flow Governing Equationsmentioning

confidence: 99%

“…1 b). The computational mesh size is based on numerous other efforts 4 J o u r n a l P r e -p r o o f at similar flow parameters, including coupled interactions [28,35] and transitional and turbulent morphing studies [36,37,38]. The computational domain is discretized in 901×283×601 grid-points in the streamwise (x), wall normal (y) and spanwise (z) directions, respectively, where the discretization is uniform in the x and z directions.…”

Section: Flow Configurationmentioning

confidence: 99%

“…In addition to the increased level of turbulence, the flow separation associated with the shock wave boundary layer interaction (SWBLI) introduces a characteristic low-frequency unsteadiness [63,37,64]. The low frequencies are 1 to 2 orders of magnitude lower compared to the turbulence frequencies, whose potential origin mechanisms have been discussed in Clemens and Narayanaswamy [65].…”

Section: Flow Unsteadiness and Turbulence Spectramentioning

confidence: 99%

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Spatially developing supersonic turbulent boundary layer subjected to static surface deformations

Shinde¹,

Becks²,

Deshmukh³

et al. 2021

European Journal of Mechanics - B/Fluids

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Control of transitional shock wave boundary layer interaction using structurally constrained surface morphing

Cited by 27 publications

References 50 publications

Review of Adaptive Shock Control Systems

Review of Adaptive Shock Control Systems

Lagrangian approach for modal analysis of fluid flows

Spatially developing supersonic turbulent boundary layer subjected to static surface deformations

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