The profile-linear average velocity for the transition in pipes based on the method of LES

Liu, Yonghui; Du, Guang-sheng; Liu, Zheng-gang; Li, Li; Tao, Li-li

doi:10.1016/s1001-6058(09)60220-1

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…Research work showed that the cause of the measurable low frequency oscillation was the shedding of dean vortices and that the oscillation and its effect on the flow field varied in strength over time. Liu et al (2010) used k-ε and Large-Eddy Simulation (LES) model to calculate the flow field of the transition zone at specific Reynolds numbers, respectively. The simulation results indicated that the LES model was more effective than the k-ε model.…”

Section: Introductionmentioning

confidence: 99%

Flow-induced Noise Prediction for 90˚Bend Pipeby LES and FW-H Hybrid Method

Zhang¹,

Luo²,

Liang³

et al. 2014

Sci. Res. Essays

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This paper focuses on an aerodynamic noise study of outlet elbow of Continuous Positive Airway Pressure (CPAP) machine by analyzing the wall pressure fluctuations and predicting the far filed sound generated by turbulent flow. A hybrid approach combing the Larger-Eddy Simulation (LES) and Ffcowcs Williams-Hawkings (FW-H) acoustic analogy was used to simulate the flow distribution as well as calculate the flow-induced noise for a three-dimensional elbow pipe. Then, a different elbow structure was designed to form the appropriate structure for the air outlet via considering the sound pressure level of each model. As a result, elbow with guiding plate was demonstrated to be an effective method to reduce the aerodynamic noise strength since this design could weaken the wall pressure fluctuation and vortex magnitude. Furthermore, the decreased magnitude could reach more than 1dB when velocity increased from 5m/s to 9m/s. The results of simulation were a little higher than experimental results since the background noise, elbow vibration and the defect of FW-H equation which couldn't be eliminated thoroughly.

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Section: Introductionmentioning

confidence: 99%

Flow-induced Noise Prediction for 90˚Bend Pipeby LES and FW-H Hybrid Method

Zhang¹,

Luo²,

Liang³

et al. 2014

Sci. Res. Essays

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show abstract

“…Guleren and A. Turan [16] validated large eddy simulation of the developing turbulent flow through stationary and rotating U-ducts with strong curvature. Yong hui Liu [17] et al did research on the characteristics of transition flow with specific Re number in pipes. The k-ε model and LES (Large Eddy Simulation) model are respectively used to calculate the flow field of the transition zone, and the experiment results show that the LES model is more effective than the k-ε model.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Zhang

2013

AMR

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The numerical simulation of the developing turbulent flow through a three-dimensional curved pipe with strong curvature is presented. This numerical simulation is to investigate the flow structure of pipe-flow through a 90° bent pipe with the aid of RNG k-ε turbulence model, which had been well validated for high screwed curvature flow. Dean Motion downstream of the bend are found and presented. And the numerical result demonstrates that Dean motions co-exist with large scale swirling motions inside the bend pipe. Snapshot of velocity and pressure reveals that the structures found upstream of the bend persist after the bend and survive the strong secondary motions induced by the pipe curvature.

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Experimental Study of Velocity Distributions in the Transition Region of Pipes

Liu

et al. 2011

J Hydrodyn

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The profile-linear average velocity for the transition in pipes based on the method of LES

Cited by 4 publications

References 17 publications

Flow-induced Noise Prediction for 90˚Bend Pipeby LES and FW-H Hybrid Method

Flow-induced Noise Prediction for 90˚Bend Pipeby LES and FW-H Hybrid Method

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

Experimental Study of Velocity Distributions in the Transition Region of Pipes

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