Numerical simulation of flow around a circular cylinder having porous surface

Hiroshi Naito; Koji Fukagata

doi:10.1063/1.4767534

Numerical simulation of flow around a circular cylinder having porous surface

Hiroshi Naito, Koji Fukagata

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

93 Citations (Scopus)

Abstract

Flow around a circular cylinder having porous surface is studied numerically by means of direct numerical simulation and large eddy simulation. The flow in the porous media is represented by a spatially averaged model. First, the properties of the most effective porous media are found from a preliminary two-dimensional parametric test. Subsequently, the dependency of flow modification on the Reynolds number (Re = 100, 1000, 3900, and 1.0 × 10⁵) and the porous layer thickness is investigated in detail. It is found that the porous surface works to suppress the velocity and pressure fluctuations and such effect is more significant at higher Reynolds number. In particular, the vortex shedding is found to be completely suppressed at Re = 1.0 × 105. The mechanism of flow modification is explained by slip velocity and energy dissipation process.

Original language	English
Article number	117102
Journal	Physics of Fluids
Volume	24
Issue number	11
DOIs	https://doi.org/10.1063/1.4767534
Publication status	Published - 2012 Nov 6

ASJC Scopus subject areas

Computational Mechanics
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1063/1.4767534

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abstract = "Flow around a circular cylinder having porous surface is studied numerically by means of direct numerical simulation and large eddy simulation. The flow in the porous media is represented by a spatially averaged model. First, the properties of the most effective porous media are found from a preliminary two-dimensional parametric test. Subsequently, the dependency of flow modification on the Reynolds number (Re = 100, 1000, 3900, and 1.0 × 105) and the porous layer thickness is investigated in detail. It is found that the porous surface works to suppress the velocity and pressure fluctuations and such effect is more significant at higher Reynolds number. In particular, the vortex shedding is found to be completely suppressed at Re = 1.0 × 105. The mechanism of flow modification is explained by slip velocity and energy dissipation process.",

author = "Hiroshi Naito and Koji Fukagata",

note = "Funding Information: The authors are grateful to Dr. Shinnosuke Obi (Keio University), Dr. Nobuhide Kasagi (The University of Tokyo), and Dr. Takehisa Takaishi (Railway Technical Research Institute) for valuable comments. This work was supported through the Keio University Global COE program, “Center for Education and Research of Symbiotic, Safe and Secure System Design.”",

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AU - Fukagata, Koji

N1 - Funding Information: The authors are grateful to Dr. Shinnosuke Obi (Keio University), Dr. Nobuhide Kasagi (The University of Tokyo), and Dr. Takehisa Takaishi (Railway Technical Research Institute) for valuable comments. This work was supported through the Keio University Global COE program, “Center for Education and Research of Symbiotic, Safe and Secure System Design.”

PY - 2012/11/6

Y1 - 2012/11/6

N2 - Flow around a circular cylinder having porous surface is studied numerically by means of direct numerical simulation and large eddy simulation. The flow in the porous media is represented by a spatially averaged model. First, the properties of the most effective porous media are found from a preliminary two-dimensional parametric test. Subsequently, the dependency of flow modification on the Reynolds number (Re = 100, 1000, 3900, and 1.0 × 105) and the porous layer thickness is investigated in detail. It is found that the porous surface works to suppress the velocity and pressure fluctuations and such effect is more significant at higher Reynolds number. In particular, the vortex shedding is found to be completely suppressed at Re = 1.0 × 105. The mechanism of flow modification is explained by slip velocity and energy dissipation process.

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Numerical simulation of flow around a circular cylinder having porous surface

Abstract

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