Direct numerical simulation of flapping flags in grid-induced turbulence

Olivieri, Stefano; Viola, Francesco; Mazzino, Andrea; Rosti, Marco E.

doi:10.1063/5.0060181

Cited by 10 publications

(5 citation statements)

References 66 publications

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“…The computational framework has been validated in a variety of flow–structure interaction test cases (de Tullio & Pascazio 2016; Olivieri et al. 2021). The chosen computational domain is a box of size , and along the streamwise, wall-normal (vertical) and spanwise directions, with the origin of the reference frame coinciding with the midpoint of plate root.…”

Section: Figure 17mentioning

confidence: 99%

“…The computational framework has been validated in a variety of flow–structure interaction test cases (de Tullio & Pascazio 2016; Olivieri et al. 2021).…”

Section: Figure 17mentioning

confidence: 99%

“…The structural dynamics of the elastic structures is solved using a spring-network model for thin membranes (Viola et al 2020). The computational framework has been validated in a variety of flow-structure interaction test cases (de Tullio & Pascazio 2016; Olivieri et al 2021).…”

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confidence: 99%

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Gap-modulated dynamics of flexible plates

Cheng,

Olivieri,

Rosti

et al. 2023

J. Fluid Mech.

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The effect of single perforations and their location on the drag and reconfiguration of flexible plates was explored through laboratory experiments and direct numerical simulations. The plates were subjected to uniform flows with negligible turbulence, and the perforations had a square cross-section resulting in a low porosity ratio of $\gamma \approx 0.028$ . Rigid plates with and without perforations and flexible plates without perforations served as the baseline cases. The perforated plates exhibited distinct jets through the openings in the wake, significantly impacting the aerodynamic force and plate deformation. The velocity and position of the centre jet velocity in relation to downwind distance were influenced by both the incoming flow and the location of the perforations. The centre jet velocity profiles were normalized using an effective velocity and corrected perforation half-width, revealing their dependence on these factors. A simple first-order formulation was developed to predict the change in drag for various perforated plates under a wide range of incoming velocities. This formulation was supported by numerical simulations across a wider range of Cauchy number to confirm the proposed model and separate the effect of the Cauchy and Reynolds numbers. The results of this study may inform the design of flexible structures, define effective porosity and serve as an initial step towards modelling the complex interaction between flow and structures with low porosity.

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Section: Figure 17mentioning

confidence: 99%

“…The computational framework has been validated in a variety of flow–structure interaction test cases (de Tullio & Pascazio 2016; Olivieri et al. 2021).…”

Section: Figure 17mentioning

confidence: 99%

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Gap-modulated dynamics of flexible plates

Cheng,

Olivieri,

Rosti

et al. 2023

J. Fluid Mech.

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“…By comparing the results between their simulation and experiments from wind tunnel test, they investigated the effect grid shape and grid position have on the characteristics of the grid-generated turbulence and concluded that it could be a viable approach in turbulence generation. In fact, much of the numerical studies investigated the production of grid-generated turbulence and their development and decay in the downstream flow [37][38][39][40][41][42]. However, there is a lack of studies conducted which utilizes the grid-generated turbulence approach to examine the turbulence interaction with aerodynamic bodies immersed in the flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Grid-Generated Turbulence Interaction with a NACA0012 Airfoil

Trascinelli,

Bowen,

Piccolo

et al. 2023

AIAA AVIATION 2023 Forum

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The present study assesses the ability to numerically predict turbulence-interaction noise of a NACA0012 airfoil with grid-generated turbulence by utilizing the Lattice Boltzmann solver PowerFLOW. Both the near-field flow characteristics and far field noise are bench-marked against an existing experimental study. The grid was chosen to match that from the experiment to provide evidence that the present numerical approach in physically placing a grid upstream of the airfoil can reproduce the turbulence characteristics observed from the benchmark experiment and thus accurately capture the turbulence-interaction noise generated. The comparison of the results show that the turbulence statistics, including turbulence intensity, integral length scales and anisotropy are highly consistent with the experiment. Moreover, far field acoustics of the turbulence interaction as well as the near-field flow properties near the leading-edge and the unsteady wall pressure fluctuations of the airfoil are also analyzed and the results agreed well with the experimental measurements. The present study confirms that the grid-generated approach is suitable for numerical investigation of turbulence-interaction noise and its potential mitigation strategies.

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“…Finally, looking at the whole oscillation spectra, it is worth mentioning the possibility of detecting the fingerprint of turbulence over a certain range of timescales. Indeed, we can model the filament as a harmonic oscillator subject to a fluctuating aerodynamic force that contains the major features of the incoming turbulent flow, and in particular its characteristic spectral content 32,34 . The resulting power spectra associated with the filament oscillation can thus be linked to that of the turbulent forcing by means of a response function dependent on the structural parameters, yielding for the investigated cases the emergence of the two power-law slopes reported in Fig.…”

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confidence: 99%

Collective dynamics of dense hairy surfaces in turbulent flow

Monti

Olivieri

Rosti

2023

Sci Rep

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Flexible filamentous beds interacting with a turbulent flow represent a fundamental setting for many environmental phenomena, e.g., aquatic canopies in marine current. Exploiting direct numerical simulations at high Reynolds number where the canopy stems are modelled individually, we provide evidence on the essential features of the honami/monami collective motion experienced by hairy surfaces over a range of different flexibilities, i.e., Cauchy number. Our findings clearly confirm that the collective motion is essentially driven by fluid flow turbulence, with the canopy having in this respect a fully-passive behavior. Instead, some features pertaining to the structural response turn out to manifest in the motion of the individual canopy elements when focusing, in particular, on the spanwise oscillation and/or on sufficiently small Cauchy numbers.

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Direct numerical simulation of flapping flags in grid-induced turbulence

Cited by 10 publications

References 66 publications

Gap-modulated dynamics of flexible plates

Gap-modulated dynamics of flexible plates

Numerical Simulation of Grid-Generated Turbulence Interaction with a NACA0012 Airfoil

Collective dynamics of dense hairy surfaces in turbulent flow

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