Synchronized Vibrations of a Circular Cylinder in Cross Flow at Supercritical Reynolds Numbers1

Kawamura, Tsutomu; Nakao, Toshitsugu; Takahashi, Masanori; Hayashi, Masaaki; Murayama, Kouichi; Gotoh, Nobuho

doi:10.1115/1.1526855

Cited by 9 publications

(2 citation statements)

References 13 publications

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“…5, the time-averaged pressure coefficient distribution on the circular cylinder is presented at the mid span. It is shown that the results predicted by the present blended models and the 14,17 . It is known that the predicted flows by different researchers 18,19 are in a relatively wide scatter at this critical Reynolds number range depending on the specific numerical schemes adopted.…”

Section: A Circular Cylinder At Supercritical Reynolds Numbersupporting

confidence: 51%

A Blended Model for Simulating Massive Flow Separation and Laminar-Turbulence Transition

You¹,

Kwon²

2012

42nd AIAA Fluid Dynamics Conference and Exhibit

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In the present study, blended models, which combine hybrid RANS/LES models and a correlation-based transition model, have been developed for simulating the flow containing massive flow separation and laminar-turbulence transition inside the boundary layer. To ensure that the base models work well in their own flow regimes of interest, and to achieve smooth transition between the flow regimes, a new blending function was developed based on an empirical analogy from Menter's k-ω SST turbulence model. The new blended models were implemented in a three-dimensional incompressible flow solver based on unstructured meshes. Validations of the blending function and the blended models were conducted for a circular cylinder at a supercritical Reynolds number, an airfoil at high angle of attack, and a dynamic stall problem of an airfoil. The results of the blended models were compared with those of the base models and the experiments. It was found that the new blended models works well by simultaneously capturing the boundary layer transition and the massive flow separation, compared to the base turbulence models. Nomenclature c = chord length of airfoil CD SST = cross diffusion term in the SST model D = diameter of circular cylinder D i = destruction term (i=k, ω, γ, θ t ) d 1 = distance to nearest wall k = turbulent kinetic energy L = turbulent length scale L vK = von Karman length scale P i = production term (i=k, ω, γ, θ t ) R T = eddy viscosity ratio (ρk/( ω μ l )) S = magnitude of strain rate t = unsteady time step U = local velocity U ∞ = freestream velocity x j = Cartesian coordinate in j-direction ρ = density ω = specific turbulent dissipation rate μ l = molecular viscosity μ t = eddy viscosity τ ij = turbulent shear stress γ = local turbulent intermittency γ eff = effective turbulent intermittency Re t  = local transition onset momentum thickness Reynolds number Ψ = azimuthal angle measured from windward stagnation point(degree)

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Section: A Circular Cylinder At Supercritical Reynolds Numbersupporting

confidence: 51%

A Blended Model for Simulating Massive Flow Separation and Laminar-Turbulence Transition

You¹,

Kwon²

2012

42nd AIAA Fluid Dynamics Conference and Exhibit

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“…Gas injection into a liquid cross flow from a nozzle causes bubble formation which has potential in a variety of industrial applications such as effervescent atomization, chemical plants [1], waste water treatment and bio-and nuclear-reactors [2,3]. For example, in effervescent atomization which is used in chemical plants, a mixture of small-size bubbles in liquid is used [4].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Nozzle Shape and Configuration on Bubble Formation in a Liquid Cross Flow

Jobehdar

Gadallah

Siddiqui

et al. 2012

Volume 1: Symposia, Parts a and B

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Gas injection into a liquid cross flow from a nozzle causes bubble formations which have potential applications in industry such as chemical plants, waste water treatment and bio-and nuclear-reactors. The purpose of this study is to experimentally investigate the effects of nozzle shape and configuration with respect to the liquid cross-flow direction, on the bubbly flow characteristics such as bubble formation, detached bubble size and frequency at different gas and liquid flow rates. The experiments were conducted in a Plexiglas two-dimensional rig using a high speed camera. High speed imaging and an image processing algorithm were used to track each individual bubble and to quantify the bubble growth as well as the detachment frequency and the bubble velocity. Back light shadowgraphy which utilizes a low intensity diffuse light source to illuminate the background was used to image bubbles. Nozzles were mounted in the test section which was designed such that the flow in this section has a two-dimensional profile.The results showed that the bubble size increases with an increase in GLR (gas to liquid flow rates ratio). Furthermore, the bubble formations and detached bubble size were strongly influenced by the nozzle shape and configuration..

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A Dynamic LES Model for Turbulent Reactive Flow with Parallel Adaptive Finite Elements

Waters

Carrington

Wang

et al. 2018

Energy for Propulsion

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Synchronized Vibrations of a Circular Cylinder in Cross Flow at Supercritical Reynolds Numbers1

Cited by 9 publications

References 13 publications

A Blended Model for Simulating Massive Flow Separation and Laminar-Turbulence Transition

A Blended Model for Simulating Massive Flow Separation and Laminar-Turbulence Transition

The Effect of Nozzle Shape and Configuration on Bubble Formation in a Liquid Cross Flow

A Dynamic LES Model for Turbulent Reactive Flow with Parallel Adaptive Finite Elements

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