Implementation of compressible porous-fluid coupling method in an aerodynamics and aeroacoustics code – Part II: Turbulent flow

Li, Zhiyong; Tang, Tingting; Liu, Yu; Arcondoulis, Elias; Yang, Yongrong

doi:10.1016/j.amc.2019.124988

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…Despite these numerical simulations, there are no experimental data to verify these results. Zhang et al [5] and Li et al [4] used a Darcy-Forcheimer model [17] to investigate the effect of PPI and porosity on the acoustic sound field of PCCs and presented internal boundary layer profiles for each PCC.…”

Section: Introductionmentioning

confidence: 99%

Internal and Near-Wall Flow Fields of a Structured Porous Coated Cylinder and Their Role in Passive Flow and Noise Control

Arcondoulis

Liu

Yang

et al. 2021

Aiaa Aviation 2021 Forum

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Section: Introductionmentioning

confidence: 99%

Internal and Near-Wall Flow Fields of a Structured Porous Coated Cylinder and Their Role in Passive Flow and Noise Control

Arcondoulis

Liu

Yang

et al. 2021

Aiaa Aviation 2021 Forum

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“…Numerical simulations typically use a bulk media approximation to overcome porous media modelling complexity, such as the Darcy–Forcheimer model (Li et al. 2020 a , b ; Zhang et al. 2020).…”

Section: Introductionmentioning

confidence: 99%

Internal shear layer and vortex shedding development of a structured porous coated cylinder using tomographic particle image velocimetry

et al. 2023

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Vortex shedding in the wake of a cylinder in uniform flow can be suppressed via the application of a porous coating; however, the suppression mechanism is not fully understood. The internal flow field of a porous coated cylinder (PCC) can provide a deeper understanding of how the flow within the porous medium affects the wake development. A structured PCC (SPCC) was three-dimensionally printed using a transparent material and tested in water tunnel facilities using flow visualisation and tomographic particle image velocimetry at outer-diameter Reynolds numbers of $Re = 7 \times 10^{3}$ and $7.3 \times 10^{4}$ , respectively. The internal and near-wall flow fields are analysed at the windward and mid-circumference regions. Flow stagnation is observed in the porous layer on the windward side and its boundary is shown to fluctuate with time in the outermost porous layer. This stagnation region generates a quasi-aerodynamic body that influences boundary layer development on the SPCC inner diameter, that separates into a shear layer within the porous medium. For the first time via experiment, spectral content within the separated shear layer reveals vortex shedding processes emanating through single pores at the outer diameter, providing strong evidence that SPCC vortex shedding originates from the inner diameter. Velocity fluctuations linked to this vortex shedding propagate through the porous layers into the external flow field at a velocity less than that of the free stream. The Strouhal number linked to this velocity accurately predicts the SPCC vortex shedding frequency.

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“…The internal flow within the randomized porous medium would be extremely difficult to measure experimentally without modifying the porous structure and it is therefore likely that these difficulties have led to few publications in this area, other than numerical studies [9][10][11][12][13]. Naito and Fukagata [14] via simulation presented boundary layer profiles of PCCs using a Darcy-Forcheimer porous medium approximation.…”

Section: Introductionmentioning

confidence: 99%

Three dimensional internal and near-wall flow features of a structured porous coated cylinder

Arcondoulis

Liu

Yang

et al. 2022

28th AIAA/CEAS Aeroacoustics 2022 Conference

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The application of a porous coating to a cylinder can significantly reduce the vortex shedding tone when placed in a uniform flow. The mechanism of how this porous media attenuates vortex shedding has been studied more in recent years yet it is still not fully understood. Typical porous materials within a certain range of porosity and airflow resistivity, such as metal foam and porous polyurethane, have been studied extensively; however, the fundamental flow mechanisms responsible for vortex shedding attenuation are very difficult to determine. For example, it is nearly impossible to visualize the internal flow field of porous media with a randomized open-cell internal structure. A Structured Porous Coated Cylinder (SPCC) was designed in recent years to alleviate this internal flow field problem, as the SPCC has clear line of sight along the span and radial direction. SPCC variations have been previously studied and shown to reduce the vortex shedding tone of a bare cylinder in a very similar manner as a randomized porous coated cylinder. In this paper, we present a Tomographic Particle Image Velocimetry study of an SPCC tested in a water tunnel, revealing the previously unseen internal and near-wall flow fields of an SPCC. The flow is visualized in the porous layers, revealing complex interaction between the freestream flow field and the porous structure. Using cross-correlation methods within the flow field, we reveal the entrainment of the flow within the porous layers. Furthermore, implementation of Proper Orthogonal Decomposition shows that vortex shedding occurs within the porous layers.

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Implementation of compressible porous-fluid coupling method in an aerodynamics and aeroacoustics code – Part II: Turbulent flow

Cited by 9 publications

References 33 publications

Internal and Near-Wall Flow Fields of a Structured Porous Coated Cylinder and Their Role in Passive Flow and Noise Control

Internal and Near-Wall Flow Fields of a Structured Porous Coated Cylinder and Their Role in Passive Flow and Noise Control

Internal shear layer and vortex shedding development of a structured porous coated cylinder using tomographic particle image velocimetry

Three dimensional internal and near-wall flow features of a structured porous coated cylinder

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