Response of a plate in turbulent channel flow: Analysis of fluid–solid coupling

Anantharamu, Sreevatsa; Mahesh, Krishnan

doi:10.1016/j.jfluidstructs.2020.103173

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…The DNS solver has been validated for a variety of problems on wall-bounded flows, including realistically rough superhydrophobic surfaces (Alamé & Mahesh 2019), random rough surfaces (Ma et al. 2021) and response of a plate in turbulent channel flow (Anantharamu & Mahesh 2021).…”

Section: Numerical Methodologymentioning

confidence: 99%

Global stability analysis and direct numerical simulation of boundary layers with an isolated roughness element

Mahesh

2022

J. Fluid Mech.

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Global stability analysis and direct numerical simulation (DNS) are used to study boundary layer flows with an isolated roughness element. The aspect ratio of the element ( $\eta$ ) is small, while the ratio of element height to displacement boundary layer thickness ( $h/\delta ^{*}$ ) is large. Both steady base flows and time-averaged mean flows are able to capture the frequencies of the primary vortical structures and mode shapes. Global stability results highlight that although the varicose instability is dominant for large $h/\delta ^{*}$ , sinuous instability becomes more pronounced as $Re_h$ increases for the thin geometry ( $\eta =0.5$ ), due to increased spanwise shear in the near-wake region. Wavemaker results indicate that $\eta$ affects the convective nature of the shear layer more than the type of instability. DNS results show that different instability mechanisms lead to different development and evolution of vortical structures in the transition process. For $\eta =1$ , the varicose instability is associated with the periodic shedding of hairpin vortices, and its stronger spatial transient growth indicated by wavemaker results aids the formation of hairpin vortices farther downstream. In contrast, for $\eta =0.5$ , the interplay between varicose and sinuous instabilities results in a broader-banded energy spectrum and leads to the sinuous wiggling of hairpin vortices in the near wake when $Re_h$ is sufficiently high. A sinuous mode with a lower frequency captured by dynamic mode decomposition analysis, and associated with the ‘wiggling’ of streaks, persists far downstream and promotes transition to turbulence. A new regime map is developed to classify and predict instability mechanisms based on $Re_{hh}^{1/2}$ and $d/\delta ^{*}$ using a logistic regression model. Although the mean skin friction demonstrates different evolutions for the two geometries, both of them efficiently trip the flow to turbulence at $Re_h=1100$ . An earlier location of a fully-developed turbulent state is established for $\eta =1$ at $x \approx 110h$ .

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Section: Numerical Methodologymentioning

confidence: 99%

Global stability analysis and direct numerical simulation of boundary layers with an isolated roughness element

Mahesh

2022

J. Fluid Mech.

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“…These simulations are performed using our in-house solid solver, MPCUGLES-SOLID. For further solver details, we refer the reader to Anantharamu & Mahesh (2021).…”

Section: Simulation Methodologymentioning

confidence: 99%

“…Table 5 shows the first 20 natural frequencies for each case in outer units. For validation of our in-house solid solver for static, dynamic and eigenvalue plate problems, we refer the reader to Appendix B of Anantharamu & Mahesh (2021).…”

Section: Solid Subproblemmentioning

confidence: 99%

Direct numerical simulation-based vibroacoustic response of plates excited by turbulent wall-pressure fluctuations

Prajapati,

Anantharamu,

Mahesh

2023

J. Fluid Mech.

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We use direct numerical simulation to study the vibroacoustic response of an elastic plate in a turbulent channel at $Re_\tau$ of 180 and 400 for three plate boundary conditions and two materials – synthetic rubber and stainless steel. The fluid–structure–acoustic coupling is assumed to be one-way coupled, i.e. the fluid affects the solid and not vice versa, and the solid affects the acoustic medium and not vice versa. The wall pressure consists of intermittent large-amplitude fluctuations associated with the near-wall, burst-sweep cycle of events. For stainless steel plates, displacement has similar large-amplitude peak events due to comparable time scales of plate vibration and near-wall eddies. For synthetic rubber plates, large-amplitude displacement fluctuations are observed only near clamped or simply supported boundaries. Away from boundaries, plate displacement resembles an amplitude-modulated wave, and no large-amplitude events are observed. We discuss displacement and acoustic pressure spectra over different frequency ranges. For frequencies much smaller than the first natural frequency, the product of plate-averaged displacement spectrum and bending stiffness squared collapses with Reynolds number and plate material in outer units. At high frequencies, displacement and acoustic pressure spectra scale better in inner units, and the scaling depends on the type of damping. For synthetic rubber plates, the spectra display an overlap region that collapses in both outer and inner units. Soft plate deformation displays a range of length scales. However, stiff plate deformation does not exhibit a similar range of scales and resembles plate mode shapes. The soft plate has two distinct deformation structures. Low-speed, large deformation structures with slow formation/break-up time scales are found away from boundaries. High-speed, small deformation structures with fast formation/break-up time scales formed due to boundary reflections exist near the boundaries.

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Large-eddy simulation for the aero-vibro-acoustic analysis: plate-cavity system excited by turbulent channel flow

Zhu

2022

Acta Mech. Sin.

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Response of a plate in turbulent channel flow: Analysis of fluid–solid coupling

Cited by 5 publications

References 20 publications

Global stability analysis and direct numerical simulation of boundary layers with an isolated roughness element

Global stability analysis and direct numerical simulation of boundary layers with an isolated roughness element

Direct numerical simulation-based vibroacoustic response of plates excited by turbulent wall-pressure fluctuations

Large-eddy simulation for the aero-vibro-acoustic analysis: plate-cavity system excited by turbulent channel flow

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