Passive control of the flow around a hemisphere using porous media

Mimeau, Chloé; Mortazavi, Iraj; Cottet, Georges-Henri

doi:10.1016/j.euromechflu.2017.03.002

Cited by 18 publications

(13 citation statements)

References 33 publications

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“…Turbulent flows and aerodynamically generated noise and vibration are ubiquitous in various engineering applications, in particular for those involving bluff bodies and airfoils. Different passive flow control methods, such as serrations (Lyu et al 2016;Lyu & Azarpeyvand 2017), surface treatments (Clark et al 2014;Afshari et al 2016) and porous treatments (Bruneau et al 2012;Showkat Ali et al 2016;Mimeau et al 2017) have been examined over the years for improving the aerodynamic performance of such devices or attenuate vortex shedding and reduce flow induced noise and vibration. The use of porous medium, in particular, prompted a large number of studies to better understand the underlying mechanisms of flow control, with researchers approaching the problem mainly from theoretical and numerical perspectives.…”

Section: Introductionmentioning

confidence: 99%

Trailing-edge flow and noise control using porous treatments

2018

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This paper is concerned with the application of porous treatments as a means of flow and aerodynamic noise reduction. An extensive experimental investigation is undertaken to study the effects of flow interaction with porous media, in particular in the context of the manipulation of flow over blunt trailing edges and attenuation of vortex shedding. Comprehensive boundary layer and wake measurements have been carried out for a long flat plate with solid and porous blunt trailing edges. Unsteady velocity and surface pressure measurements have also been performed to gain an in-depth understanding of the changes to the energy–frequency content and coherence of the boundary layer and wake structures as a result of the flow interaction with a porous treatment. Results have shown that permeable treatments can effectively delay the vortex shedding and stabilize the flow over the blunt edge via mechanisms involving flow penetration into the porous medium and discharge into the near-wake region. It has also been shown that the porous treatment can effectively destroy the spanwise coherence of the boundary layer structures and suppress the velocity and pressure coherence, particularly at the vortex shedding frequency. The flow–porous scrubbing and its effects on the near-wall and large coherent structures have also been studied. The emergence of a quasi-periodic recirculating flow field inside highly permeable surface treatments has also been investigated. Finally, the paper has identified several important mechanisms concerning the application of porous treatments for aerodynamic and aeroacoustic purposes, which can help more effective and tailored designs for specific applications.

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Section: Introductionmentioning

confidence: 99%

Trailing-edge flow and noise control using porous treatments

2018

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“…By remeshing at each time step, we obtain a forward, conservative, semi-Lagrangian method [21,22]. These methods were applied to various flows including porous media [23,24]. In the present investigation we employ particles to solve equations (2d), (2e) and (2f), where the quantities carried by the particles are ω, S and C. If V = (ω, S, C), one advective step can be written as…”

Section: Semi-lagrangian Computational Approachmentioning

confidence: 99%

Double-diffusive sedimentation at high Schmidt numbers: Semi-Lagrangian simulations

et al. 2021

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When particle-laden freshwater is placed above clear saltwater, double-diffusive sedimentation can arise. Navier-Stokes direct numerical simulations by Burns and Meiburg showed that this process can be dominated by either Rayleigh-Taylor or double-diffusive fingering instabilities. Based on twodimensional simulations, those authors identify a single dimensionless parameter that can be employed to distinguish between these regimes. Here we develop a high-performance semi-Lagrangian computational approach that enables us to extend these high Schmidt number simulations to three dimensions, and to confirm the validity of their proposed scaling law for three-dimensional flows.

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“…The actual development started with the introduction of high-order remeshing formulas, well-suited to GPU implementation using OpenCL [17,13]. More recently, the code has been successfully used for passive control of bluff body flows [37] and for sediment flow simulations [26]. In the next paragraphs we briefly describe the key features of the library.…”

Section: Hybrid Cpu-gpu Implementationmentioning

confidence: 99%

Improvement of remeshed Lagrangian methods for the simulation of dissolution processes at pore-scale

Etancelin

Moonen

Poncet

2020

Advances in Water Resources

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This article shows how to consistently and accurately manage the Lagrangian formulation of chemical reaction equations coupled with the superficial velocity formalism introduced in the late 80s by Quintard and Whitaker. Lagrangian methods prove very helpful in problems in which transport effects are strong or dominant, but they need to be periodically put back in a regular lattice, a process called remeshing. In the context of digital rock physics, we need to ensure positive concentrations and regularity to accurately handle stagnation point neighborhoods. These two conditions lead to the use of kernels resulting in extra-diffusion, which can be prohibitively high when the diffusion coefficient is small. This is the case especially for reactive porous media, and the phenomenon is reinforced in porous rock matrices due to Archie's law. This article shows how to overcome this difficulty in the context of a two-scale porosity model applied in the Darcy-Brinkman-Stokes equations, and how to obtain simultaneous sign preservation, regularity and accurate diffusion, and apply it to dissolution processes at the pore scale of actual rocks.

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Passive control of the flow around a hemisphere using porous media

Cited by 18 publications

References 33 publications

Trailing-edge flow and noise control using porous treatments

Trailing-edge flow and noise control using porous treatments

Double-diffusive sedimentation at high Schmidt numbers: Semi-Lagrangian simulations

Improvement of remeshed Lagrangian methods for the simulation of dissolution processes at pore-scale

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