Flow around a Finite Circular Cylinder Coated with Porous Media

Yuan, Haidong; Xia, Chao; Yu, Chunlei; Yang, Zhigang

doi:10.2514/6.2016-0573

Cited by 13 publications

(7 citation statements)

References 18 publications

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“…Therefore, the outer diameters are chosen to be D = 96 mm with an inner bare diameter of d = 64 mm and thus the ratio of the porous coating thickness to the bare cylinder diameter, t d, is 0.25. This t d ratio is consistent with the aeroacoustic investigation presented in Arcondoulis et al [7] and within the typical t d range of others [1,3,4,8,9,12,15,18]. It is also important to ensure that the Reynolds number range is within the range of previously published data for comparative purposes.…”

Section: A Diameter and Coating Thickness Selectionsupporting

confidence: 88%

The internal and external flow fields of a structured porous coated cylinder and implications on flow-induced noise

Arcondoulis

Ragni

Carpio

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

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Section: A Diameter and Coating Thickness Selectionsupporting

confidence: 88%

The internal and external flow fields of a structured porous coated cylinder and implications on flow-induced noise

Arcondoulis

Ragni

Carpio

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

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“…The Reynolds number range of interest is based on published data of both porous coated [2,4,5,6,8,12,13,19,24] and bare cylinders [16,25,26,27] corresponding to Reav,min≈0.8×105 to Reav,max≈1.5×105. Therefore a value of D is required such that a similar Reynolds number range could be obtained while also producing shedding tones that are above the anechoic limits of the wind tunnel (approximately 200 Hz) and well-exceed the background noise (that typically decreases with increasing frequency).…”

Section: Methodsmentioning

confidence: 99%

Structured Porous Material Design for Passive Flow and Noise Control of Cylinders in Uniform Flow

Arcondoulis

Liu

et al. 2019

Materials

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Cylindrical bodies in uniform flows can be coated with a porous medium as a passive flow and noise control method in an effort to reduce the acoustic effects of vortex shedding. To date, the employed open-cell porous materials typically possess a randomized internal structure. This paper presents the design and validation of a novel 3-D printed structured porous coated cylinder that has significant flexibility, in that the porosity and pores per inch of the porous coating can be modified independently and relatively easily. The performance of the structured porous coating design is compared against porous polyurethane and metal foam with the same coating dimensions and similar pores per inch and porosity via an experimental acoustic investigation, revealing strong similarity in the passive noise control performance of each material type. A numerical comparison illustrates the similarities of the wake structure of the 3-D printed porous coated cylinder to an equivalent Darcy–Forchheimer model simulation that represents a randomized internal porous structure. The performance similarities of these different porous material types indicate that a structured porous geometry can be used to understand the internal flow behavior of the porous medium responsible for reducing the cylinder vortex shedding tone that is otherwise extremely difficult or impossible with typical randomized porous structures. Moreover, significant potential exists for the porous structure to be further optimized or smartly tailored by architectural design for different control purposes, coating geometries and dimensions, and working conditions.

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“…There is good agreement on the impact of a full porous coating on the wake of a cylinder, with the wake being stabilised due to the reduction or the delay of vortex shedding [2,[9][10][11][12][13][14][15][16][17][18][19]. Consequently, many studies concluded that the porous coating reduced the fluctuation of aerodynamic forces [2,9,10,[17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, many studies concluded that the porous coating reduced the fluctuation of aerodynamic forces [2,9,10,[17][18][19]. With regard to drag reduction, there has been some discrepancy in the results with some studies finding an increase in drag [2,9,[14][15][16][17]20,21] and others finding a decrease in drag [11,12,[17][18][19]21].…”

Section: Introductionmentioning

confidence: 99%

Passive Flow Control for Drag Reduction on a Cylinder in Cross-Flow Using Leeward Partial Porous Coatings

Guinness

Persoons

2021

Fluids

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This paper presents a numerical study on the impact of partial leeward porous coatings on the drag of circular cylinders in cross-flow. Porous coatings are receiving increasing attention for their potential in passive flow control. An unsteady Reynolds-averaged Navier–Stokes model was developed that agreed well with the numerical and experimental literature. Using the two-equation shear stress transport k−ω turbulence model, 2D flow around a circular cylinder was simulated at Re = 4.2×104 with five different angles of partial leeward porous coatings and a full porous coating. For coating angles below 130∘, the coating resulted in an increase in pressure on the leeward side of the cylinder. There was a significant reduction in the fluctuation of the pressure and aerodynamic forces and a damping effect on vortex shedding. Flow separation occurred earlier; the wake was widened; and there was a decrease in turbulence intensity at the outlet. A reduction of drag between 5 and 16% was measured, with the maximum at a 70∘ coating angle. The results differed greatly for a full porous coating and a 160∘ coating, which were found to cause an increase in drag of 42% and 43%, respectively. The results showed that leeward porous coatings have a clear drag-reducing potential, with possibilities for further research into the optimum configuration.

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Flow around a Finite Circular Cylinder Coated with Porous Media

Cited by 13 publications

References 18 publications

The internal and external flow fields of a structured porous coated cylinder and implications on flow-induced noise

The internal and external flow fields of a structured porous coated cylinder and implications on flow-induced noise

Structured Porous Material Design for Passive Flow and Noise Control of Cylinders in Uniform Flow

Passive Flow Control for Drag Reduction on a Cylinder in Cross-Flow Using Leeward Partial Porous Coatings

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