Computation of the turbulent plane plume using the k–ϵ–t′2–γ model

Kalita, Kalyan; Dewan, Anupam; Dass, Anoop K.

doi:10.1016/s0307-904x(00)00018-4

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…Goldberg and Apsley [20] presented k-ε turbulence model for low Reynolds number based on the following three attributes: (1) it involves neither explicit wall distance nor normal-to-wall directionality, except to the first grid point off walls; (2) it enforces time scale reliability; (3) it involves a simple wall boundary condition for k-ω. Kalita et al [21] used the k-ϵ-t′2-γ model to present the computation of the turbulent plane plume. Song et al [22] investigated turbulence models in a CFD model of a blood pump.…”

Section: Resultsmentioning

confidence: 99%

Performance of k-ω and k-ε Model for Blood Flow Simulation in Stenosed Artery

Kabir

Sultana

Uddin

2021

GANIT: J. Bangladesh Math. Soc.

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Blood flow through arterial stenosis can play a crucial role at the post stenotic flow regions. This produces a disturbance in the normal flow path. The intensity of the flow disturbance (i.e. laminar, transitional and turbulent flow characteristics) depends not only on the severity of the stenosis but also on the pattern of the geometrical model. In that case, the turbulence model plays vital role to measure these flow disturbances. However, it is very important to choose a proper flow simulation model that can predict the flow behavior of fluid accurately and efficiently with less computational cost and time. Thus, this study aims to analyze the results of two turbulence models i.e. k-ω and k-ε for blood flow simulation to compare their performance for the prediction of the flow behavior. Simulations have been performed with 75% area reductions in the arteries. The results of simulation show that, the flow parameters obtained from the k-ε model exhibits lack of fits with the experimental data. On the other hand, k-ω model can capture large scale gradient in the different parameters of blood flow and has a good agreement with the experimental data. This study suggests that, k-ω model has the better performance comparing to k-ε model to predict the behavior of blood flow in stenosed artery. GANIT J. Bangladesh Math. Soc. 40.2 (2020) 111-125

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Section: Resultsmentioning

confidence: 99%

Performance of k-ω and k-ε Model for Blood Flow Simulation in Stenosed Artery

Kabir

Sultana

Uddin

2021

GANIT: J. Bangladesh Math. Soc.

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“…Cho and Chung [22] developed a more economical intermittency model by incorporating an intermittency transport equation into an already existing ε − k turbulence model. Several groups extended the Cho and Chung [22] intermittency model and applied this to different applications such as an axisymmetric plume [23], and a plane plume [24]. Pope [25] also calculated intermittency using a velocity-composition transported PDF and Savill [26] discussed the development of a Reynolds stress intermittency transport model for predicting intermittency in transitional flows which was subsequently used successfully by Alvani [27] to improve PDF predictions for pre-ignition mixing of combusting ignitability.…”

Section: Boersma and Lelementioning

confidence: 99%

LES of intermittency in a turbulent round jet with different inlet conditions

et al. 2010

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“…x > 0 y → ∞u = u a , T = T a (10) where u o andT o are the source velocity and temperature, u a and T a are the ambient values respectively and d is the slot width at the plume exit (d/2 is the slot half-width). The equations (1)-(3) form a parabolic system and are solved by using the well established method described by Patankar [14].…”

Section: The Mathematical Modelmentioning

confidence: 99%

“…A total of 500 lateral grid cells, distributed nonuniformly, have been used. This procedure has been used extensively for both turbulent plumes (Chen and Chen [2], Kalita et al, [10]) and for laminar plumes (Haaland and Sparrow, [7], Jia, [9]). …”

Section: The Mathematical Modelmentioning

confidence: 99%

A note on mixed convection of laminar plane water plumes at temperatures around the density extremum

Pantokratoras

2007

Arch Appl Mech

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In all studies concerning mixed convection in plane laminar plumes a linear relationship between fluid density and temperature has been used. However, it is known that the water density-temperature relationship is non-linear at low temperatures with a density maximum at 3.98 • C for pure water. In this note the problem of plane laminar water plume in a coflowing vertical free stream has been investigated taking into account the non-linearity between density and temperature. This is the first work in the literature which treats plane mixed convection plumes with nonlinear relation between density and temperature. Both rising and descending plumes have been investigated. It was found that the ambient water temperature plays an important role on the results. When the ambient temperature is greater than maximum density temperature (T a > T m ), the water plume behavior is similar to that of the classical plume with linear density-temperature relationship. However, when the ambient temperature is equal or lower than the maximum density temperature the water plume behavior is completely different from the classical plume with linear density-temperature relationship. The centerline velocity shows a series of maxima and minima which are produced by the combination of the nonlinear density-temperature relation and the free stream.

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Computation of the turbulent plane plume using the k–ϵ–t′2–γ model

Cited by 9 publications

References 15 publications

Performance of k-ω and k-ε Model for Blood Flow Simulation in Stenosed Artery

Performance of k-ω and k-ε Model for Blood Flow Simulation in Stenosed Artery

LES of intermittency in a turbulent round jet with different inlet conditions

A note on mixed convection of laminar plane water plumes at temperatures around the density extremum

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