Investigation of Shock Wave Oscillations over a Flexible Panel in Supersonic Flows

Varigonda, Santosh Vaibhav; Narayanaswamy, Venkateswaran

doi:10.2514/6.2019-3543

Cited by 13 publications

(8 citation statements)

References 8 publications

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“…The peak wall pressure of the rigid STBLI is greater than for the flexible case. The pressure drop over the panel prior to flow separation and the reduction of peak wall pressure compared with the rigid case are also seen in numerical simulations by Zope et al (2021) and Pasquariello et al (2015), and experiments by Gramola et al (2020) and Varigonda and Narayanaswamy (2019). For the flexible panel, the wall pressure peaks farther downstream and rises (induced by the separation shock) farther upstream than in the rigid-wall configuration.…”

Section: Effects Of Panel Flexibility On Wall Pressure Skin Friction ...mentioning

confidence: 56%

“…In a sequence of experiments targeting statistically quasi-two-dimensional configurations of oblique STBLIs impinging on a rectangular thin flexible panel, Willems, Gulhan, and Esser (2013) and Daub, Willems, and Gülhan (2016) investigated the effects of the free-stream Mach number (M ∞ ) and the incident oblique shock angle (𝜃). By carefully controlling the pressure differential across the flexible panel, Varigonda and Narayanaswamy (2019) investigated interactions resulting in concave and convex panel curvature. Tripathi, Mears, Shoele, and Kumar (2020) assessed the effects of the Reynolds number, shock impingement location and cavity pressure on the panel dynamics and separation bubble characteristics in M ∞ = 2 oblique STBLIs.…”

Section: Introductionmentioning

confidence: 99%

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Fluid–structural coupling of an impinging shock–turbulent boundary layer interaction at Mach 3 over a flexible panel

Hoy

Bermejo-Moreno²

2022

Flow

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We present high-fidelity numerical simulations of the interaction of an oblique shock impinging on the turbulent boundary layer developed over a rectangular flexible panel, replicating wind tunnel experiments by Daub et al. (AIAA Journal, vol. 54, 2016, pp. 670–678). The incoming free-stream Mach and unit Reynolds numbers are $M_{\infty } = 3$ and $Re_{\infty }=49.4\times 10^6 {\rm m}^{-1}$ , respectively. The reference boundary layer thickness upstream of the interaction with the shock is $\delta _0 = 4$ mm. The oblique shock is generated with a rotating wedge initially parallel to the flow that increases the deflection angle up to $\theta _{{max}} = 17.5^{\circ }$ within approximately $15$ ms. A loosely coupled partitioned flow–structure interaction simulation methodology is used, combining a finite-volume flow solver of the compressible wall-modelled large-eddy simulation equations, an isoparametric finite-element solid mechanics solver and a spring-system-based mesh deformation solver. Simulations are conducted with rigid and flexible panels, and the results compared to elucidate the effects of panel flexibility on the interaction. Three-dimensional effects are evaluated by conducting simulations with both full ( $50 \delta _0$ ) and reduced ( $5\delta _0$ ) spanwise panel width, the latter enforcing spanwise periodicity. Panel flexibility is found to increase the separation bubble size and modify its spectral dynamics. Time- and spanwise-averaged streamwise profiles of the wall pressure exhibit a drop over the flexible panel prior to the interaction and a reduced peak pressure in comparison with the rigid case. Spectral analyses of wall pressure data indicate that the low-frequency motions have a similar spectral distribution for the rigid and flexible cases, but the flexible case shows a wider region dominated by low-frequency motions and traces of the panel vibration on the wall pressure signal. The sensitivity of the interaction to small variations in the wedge extent and incoming boundary layer thickness is evaluated. Predictions obtained from lower-fidelity modelling simplifications are also assessed.

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Section: Effects Of Panel Flexibility On Wall Pressure Skin Friction ...mentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Fluid–structural coupling of an impinging shock–turbulent boundary layer interaction at Mach 3 over a flexible panel

Hoy

Bermejo-Moreno²

2022

Flow

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“…The results show that the coupling is mainly one-way and has no significant effect on the panel response. Varigonda et al [8] studied the interaction of fluid structures when oblique shock waves impinged on elastic panels. Tripathi et al [9] conducted an experimental study on the coupling effect between unsteady impact inclined shock waves and flexible plates at Mach number 2, and studied the influence of Reynolds number, impact position, cavity pressure and other parameters on the dynamic characteristics of the panels.…”

Section: Introductionmentioning

confidence: 99%

Influence of panel oscillation on the shock flow field in isolator under complex background wave system

Wang

Zhu

et al. 2023

J. Phys.: Conf. Ser.

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In this paper, a self-developed solver is used to numerically simulate the isolator section under complex inlet conditions, and the influence of forced panel vibration on the shock flow field in the isolator under complex inlet conditions is investigated. The results show that the forced vibration of the panel has a certain influence on the shock flow field in the isolator under complex inlet conditions.

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“…They are encountered in military settings, resulting from ballistic or explosive impact, and pose major safety hazards to people and equipment. Additionally, they are an important safety consideration when designing supersonic aircraft [3] and in controlling ignition or pressure waves from certain chemical processes [4,5]. The design of materials that are capable of withstanding and dissipating the energy from these shock waves decreases the danger to the user; however, many traditional materials are incapable of either dissipating the shock energy effectively or maintaining their structural integrity after shock for continued use.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Shock Dissipation in Semicrystalline Polyethylene

Mikhail,

Rutledge

2023

Polymers

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Semicrystalline polymers are lightweight, multiphase materials that exhibit attractive shock dissipation characteristics and have potential applications as protective armor for people and equipment. For shocks of 10 GPa or less, we analyzed various mechanisms for the storage and dissipation of shock wave energy in a realistic, united atom (UA) model of semicrystalline polyethylene. Systems characterized by different levels of crystallinity were simulated using equilibrium molecular dynamics with a Hugoniostat to ensure that the resulting states conform to the Rankine–Hugoniot conditions. To determine the role of structural rearrangements, order parameters and configuration time series were collected during the course of the shock simulations. We conclude that the major mechanisms responsible for the storage and dissipation of shock energy in semicrystalline polyethylene are those associated with plastic deformation and melting of the crystalline domain. For this UA model, plastic deformation occurs primarily through fine crystallographic slip and the formation of kink bands, whose long period decreases with increasing shock pressure.

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Investigation of Shock Wave Oscillations over a Flexible Panel in Supersonic Flows

Cited by 13 publications

References 8 publications

Fluid–structural coupling of an impinging shock–turbulent boundary layer interaction at Mach 3 over a flexible panel

Fluid–structural coupling of an impinging shock–turbulent boundary layer interaction at Mach 3 over a flexible panel

Influence of panel oscillation on the shock flow field in isolator under complex background wave system

Mechanisms of Shock Dissipation in Semicrystalline Polyethylene

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