Numerical Simulation of Turbulent Driven Secondary Flow in a 90° Bend Pipe

Chen, Min; Zhang, Zhi Guo

doi:10.4028/www.scientific.net/amr.765-767.514

Cited by 3 publications

(3 citation statements)

References 18 publications

(16 reference statements)

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“…A substantial amount of work has been done on developing turbulent flow in 90° pipe bends by means of experimental and numerical methods [1]- [15]. Most of these works has been solved by RANS equation and it was established that RNG k-ϵ model provides relatively better approximation along with being relatively cost-efficient.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the sudden conversion of the path from straight to a curvilinear region a centrifugal force act on that particular curved section and the working fluid passing through the section changes its direction. For the change of its direction secondary cross-stream flow reversal occurs whereas variation in the Reynolds number as well as curvature ratio influence the formation of the secondary flow [1]- [4]. While experimenting with the bend pipe design strategy, the effects curvature ratio is analyzed in several experimental as well as numerical study and it has been substantially established that bringing changes in the curvature ratio provide significant changes in the fluid flow.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Computational Investigation of Turbulent Flow Development in 180° Channel with Circular Cross Section

Hossain¹,

Hossain²

2018

EJERS

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The present study focuses on the analysis of flow characteristics inside a 180° bent channel by adopting two distinct RANS model namely, Realizable k-ϵ and Reynolds Stress Model (RSM). The computation results, obtained from both case study have been validated against experimental data at different cross-sections throughout the bend region and downstream tangent for velocity distribution. The anisotropic behavior of turbulent flow was illustrated for both case study inside the bend region and it has been established that after 3° the flow gradually became more intense at the outer core. Pressure coefficient throughout the u-channel was depicted for both turbulence model and a characteristic feature has been obtained. Due to centrifugal force and high inlet Reynolds number, a pair of counter-rotating Dean vortices were constructed at different stations inside the bend region. From both demonstrations, it was revealed that, Realizable k-ϵ model provided relatively better approximation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Computational Investigation of Turbulent Flow Development in 180° Channel with Circular Cross Section

Hossain¹,

Hossain²

2018

EJERS

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“…Applying RNG k-epsilon model the flow structure was investigated as well as variation in pressure and velocity along the bend region was presented by the study. Their numerical result demonstrates that Dean motions co-exist with large scale swirling motions inside the bend pipe [4]. A certain Reynolds number of 4.45E04 is used by Abdelkrim Miloud et al to investigate the turbulent flows through a u-bend pipe.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Turbulent Flow Characteristics by Utilizing k-? Turbulence Model.

Hossain

Pramanik

et al. 2017

EJENG

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This study attempts to illustrate the behavior of a fully developed turbulent flow by using k-? turbulence model. A two dimensional smooth bend channel is adopted for this experiment and water was chosen as working fluid. The Reynolds number was gradually increased to predict the diversity in turbulent kinetic energy (TKE), turbulent dissipation rate, turbulent intensity and eddy viscosity. Primarily the flow has been solved by employing three distinct k-? turbulence models namely, Standard, Renormalization-group (RNG) and Realizable model. After experimenting with ten different sample (from 74E03 to 298E03) of Reynolds numbers, each of these analyses explicitly showed that Standard k-? model gives much higher value of any aforementioned turbulent properties with respect to other two equation turbulence models. Later it’s been discovered that TKE obtained from Standard k-? model is almost same as Realizable k-? model (for Re=298E03, the difference is about 1.8%). It has been observed that the skin friction coefficient at the bend region obtained from different two equation models (Standard, Realizable and RNG k-? model and Standard k-? model) are almost similar to each other for each sample of Reynolds number. Quadrilateral elements were taken into consideration for grid generation in this analysis. Also, to decrease cost and to achieve further accuracy as well as reduced time consumption mapped faced meshing was utilized.

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Analyzing the Turbulent Flow Characteristics by Utilizing k-ϵ Turbulence Model.

Hossain¹,

Hossain²,

Pramanik³

et al. 2017

EJERS

View full text Add to dashboard Cite

This study attempts to illustrate the behavior of a fully developed turbulent flow by using k-ε turbulence model. A two dimensional smooth bend channel is adopted for this experiment and water was chosen as working fluid. The Reynolds number was gradually increased to predict the diversity in turbulent kinetic energy (TKE), turbulent dissipation rate, turbulent intensity and eddy viscosity. Primarily the flow has been solved by employing three distinct k-ϵ turbulence models namely, Standard, Renormalization-group (RNG) and Realizable model. After experimenting with ten different sample (from 74E03 to 298E03) of Reynolds numbers, each of these analyses explicitly showed that Standard k-ε model gives much higher value of any aforementioned turbulent properties with respect to other two equation turbulence models. Later it’s been discovered that TKE obtained from Standard k-ω model is almost same as Realizable k-ε model (for Re=298E03, the difference is about 1.8%). It has been observed that the skin friction coefficient at the bend region obtained from different two equation models (Standard, Realizable and RNG k-ϵ model and Standard k-ω model) are almost similar to each other for each sample of Reynolds number. Quadrilateral elements were taken into consideration for grid generation in this analysis. Also, to decrease cost and to achieve further accuracy as well as reduced time consumption mapped faced meshing was utilized.

show abstract

Numerical Simulation of Turbulent Driven Secondary Flow in a 90° Bend Pipe

Cited by 3 publications

References 18 publications

Computational Investigation of Turbulent Flow Development in 180° Channel with Circular Cross Section

Computational Investigation of Turbulent Flow Development in 180° Channel with Circular Cross Section

Analyzing the Turbulent Flow Characteristics by Utilizing k-? Turbulence Model.

Analyzing the Turbulent Flow Characteristics by Utilizing k-ϵ Turbulence Model.

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