Numerical simulation of bubbly flow around two tandem square-section cylinders by vortex method

Degawa, Tomohiro; Uchiyama, Tomomi

doi:10.1243/09544062jmes697

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…Thus far, three approaches have been used in computational fluid dynamics to simulate bubbly flows around an obstacle: Eulerian–Eulerian (E–E) (Bamardouf and McNeil, 2009; Uchiyama, 2003a; Uchiyama, 2003b), Eulerian–Lagrangian (E–L) (Sugiyama et al , 2001) and Lagrangian–Lagrangian (L–L) (Degawa and Uchiyama, 2008; Huang et al , 2006). This classification is based on a mathematical description of each phase, with which its governing equations are solved using either a mesh-free method or mesh-based method.…”

Section: Introductionmentioning

confidence: 99%

“…A comprehensive understanding of the phenomena of gas-liquid two-phase flows around obstacles would allow for improved design and control of related engineering devices. Therefore, several researchers investigated their characteristics by generating a liquid flow around obstacles at a Reynolds number with a mixture of entrained bubbles in the upstream region, such as Inoue et al (1986), Yokosawa et al (1986), Lian et al (1999), Uchiyama (2003aUchiyama ( , 2003b, Sugiyama et al (2001), Bamardouf and McNeil (2009), Huang et al (2006) and Degawa and Uchiyama (2008).…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of bubbly flow around a cylinder by semi-Lagrangian–Lagrangian method

Nguyen

Degawa

Uchiyama

et al. 2019

HFF

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Purpose The purpose of this study is to design numerical simulations of bubbly flow around a cylinder to better understand the characteristics of flow around a rigid obstacle. Design/methodology/approach The bubbly flow around a circular cylinder was numerically simulated using a semi-Lagrangian–Lagrangian method composed of a vortex-in-cell method for the liquid phase and a Lagrangian description of the gas phase. Additionally, a penalization method was applied to account for the cylinder inside the flow. The slip condition of the bubbles on the cylinder’s surface was enforced, and the outflow conditions were applied to the liquid flow at the far field. Findings The simulation clarified the characteristics of a bubbly flow around a circular cylinder. The bubbles were shown to move around and separate from both sides of the cylinder, because of entrainment by the liquid shear layers. Once the bubbly flow fully developed, the bubbles distributed into groups and were dispersed downstream of the cylinder. A three-dimensional vortex structure of various scales was also shown to form downstream, whereas a quasi-stable two-dimensional vortex structure was observed upstream. Overall, the proposed method captured the characteristics of a bubbly flow around a cylinder well. Originality/value A semi-Lagrangian–Lagrangian approach was applied to simulate a bubbly flow around a circular cylinder. The simulations provided the detail features of these flow phenomena.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation of bubbly flow around a cylinder by semi-Lagrangian–Lagrangian method

Nguyen

Degawa

Uchiyama

et al. 2019

HFF

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“…Höhne et al [4] illustrated experimentally and numerically using interfacial area density model to simulate the two-horizontal flow regimes using ANSYS CFX. Degawa et al [5] examined numerically using vortex techniques to simulate the water-air bubbly fluid flow around tandem circular cylinder. Zhou et al [6] numerically investigated the influence of Reynolds number on the vortex distribution and the dispersions of the particle around a circular cylinder by implementing the Lattice Boltzmann and the non-equilibrium extrapolation techniques.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Two-phase Fluid Flow over a Rectangular Obstructions Located Inside Enlarged Rectangular Channel

Radhi¹,

Mohsen²,

Abdulkadhim³

2019

MMEP

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The two-phase fluid flow had many engineering applications like the fluidized bed, combustion, separation and collection of ducts, nuclear waste disposal, etc. which is the motivation for the researchers to investigate this phenomenon. In present investigation an experimental facility was developed to study the two-phase flow behavior inside a rectangular channel with rectangular obstructions with various air/water flow rates. The flow arrangement, air bubble generation along with pressure drop and pressure fluctuations were monitored in the present work. The experimental data was recorded using four pressure transducers and the air-water flow behavior was visualized with a camcorder for air flow rates of 8.3, 16.6, and 25 L/min and different water flow rates of 5, 10, 15 and 20 L/min. The results showed that by increasing the water or air flow rate values, the shape, size and amount of air bubbles in the water change accordingly. Higher water flow rate causes the flow to become highly turbulent and frothy. Furthermore, significant increase in the pressure difference along the channel was observed after increasing the gas and fluid discharge values.

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“…These works, as mentioned above, such as Eslami et al, 5 Degawa and Uchiyama 6 and Farhadi and Rahnama 7 have been performed in periodic laminar or turbulent flow range and less attention was given to flow instability boundaries.…”

Section: Introductionmentioning

confidence: 99%

Investigation of harmonic instability of laminar fluid flow past 2D rectangular cross sections with 0.5–4 aspect ratios

Dehkordi

Fallah

Niazmand

2013

Proceedings of the Institution of Mechanical Engineers, Part C:

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The viscous, incompressible and laminar flow around rectangular cross sections is simulated via a Cartesian-Staggered grid finite volume method for various of aspect ratios. Simulations were carried out for a range of 10–150 Reynolds number and aspect ratios of 0.5–4. In the present work, The Great-Source Technique is used to satisfy directly the no slip condition. The grid is refined in the same size in the back and front regions of the body, but for increasing computation accuracy, the region of rectangular section has been refined more. Because of widespread application of rectangular cross sections and less attendance on it than circular sections, especially in laminar flow and low Reynolds, the aim of this study is to investigate the range of harmonic instability and estimation of its critical Reynolds number. For this purpose, The shedding frequency and The variation of lift and drag coefficients with time and Reynolds numbers have been analyzed for various of aspect ratios. The results show that increase in aspect ratios leads the rise in critical Reynolds number.

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Numerical simulation of bubbly flow around two tandem square-section cylinders by vortex method

Cited by 5 publications

References 14 publications

Numerical simulation of bubbly flow around a cylinder by semi-Lagrangian–Lagrangian method

Numerical simulation of bubbly flow around a cylinder by semi-Lagrangian–Lagrangian method

Experimental Investigation of Two-phase Fluid Flow over a Rectangular Obstructions Located Inside Enlarged Rectangular Channel

Investigation of harmonic instability of laminar fluid flow past 2D rectangular cross sections with 0.5–4 aspect ratios

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