Mean pressure distributions around a circular cylinder in the branch of a T-junction with/without vanes

Wu, Bo; Yin, Yantao; Mei, Lin; Wang, Liang-Bi; Zeng, Min; Wang, Qiuwang

doi:10.1016/j.applthermaleng.2014.12.025

Cited by 17 publications

(3 citation statements)

References 29 publications

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“…Chuang and Y.M. Ferng [38,39], and Wu et al [40] In their research, the phenomena of the backflow occurred when M R ≤ 0.05, M R ≤ 0.062, M R ≤ 0.06, and M R ≤ 0.05, respectively. The difference may be the limit of observation methods in the experiment regarding the inadequate sensitivity of temperature sensors.…”

Section: Characteristics Of Backflow In the Teementioning

confidence: 95%

Numerical Simulation of Non-Isothermal Mixing Flow Characteristics with ELES Method

Sun

Wang²,

Jiang

et al. 2022

Applied Sciences

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Thermal fatigue caused by turbulent thermal mixing in tee pipes is always one of the failure factors of industrial pipes. At present, computational fluid dynamics (CFD) is still the main research method to study the thermal fatigue mechanism. Due to the limitations of the large eddy simulation (LES) model and the classical Reynolds Averaged Navier–Stokes (RANS) model in simulating thermal mixing, an advanced Embedded LES (ELES) model was developed. By comparing the model with data in the open literature, the validity of the ELES model to iso-thermal mixing was evaluated and proven. After that, the flow characteristics of the backflow upstream with different momentum ratios (MR) were studied using the ELES method, as well as the temperature characteristics near the wall where the backflow appears. It was found that the characteristics of the backflow and the temperature distribution upstream in the tee were different with different MR values and some regions under specified MR values are found to be more prone to thermal fatigue at the intersection of the tee upstream. Moreover, the frequency analysis at specified points near the wall under three different MR values was estimated to evaluate thermal fatigue and the results showed that long-period fluctuations of lower frequencies than 6 Hz upstream were observed. This work helps form a comprehensive understanding of the backflow in thermal mixing and the relationship between fatigue and backflow in the tee.

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Section: Characteristics Of Backflow In the Teementioning

confidence: 95%

Numerical Simulation of Non-Isothermal Mixing Flow Characteristics with ELES Method

Sun

Wang²,

Jiang

et al. 2022

Applied Sciences

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“…Several papers about simplified T-junction models of the vents of high-speed trains have been published by the members of our group. They mainly focused on the distribution and high-order statistics of the velocity in cross ducts, as well as the distribution of pressure in branch ducts [ 20 , 21 , 22 , 23 ]. Atzori et al [ 24 ] studied the coherent structure of a square duct, and the results showed that the large-scale structure attached to a horizontal wall has the same size as that of a vertical wall.…”

Section: Introductionmentioning

confidence: 99%

Coherent Structure of Flow Based on Denoised Signals in T-junction Ducts with Vertical Blades

Wang

Mei

2019

Entropy

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The skin friction consumes some of the energy when a train is running, and the coherent structure plays an important role in the skin friction. In this paper, we focus on the coherent structure generated near the vent of a train. The intention is to investigate the effect of the vent on the generation of coherent structures. The ventilation system of a high-speed train is reasonably simplified as a T-junction duct with vertical blades. The velocity signal of the cross duct was measured in three different sections (upstream, mid-center and downstream), and then the coherent structure of the denoised signals was analyzed by continuous wavelet transform (CWT). The analysis indicates that the coherent structure frequencies become abundant and the energy peak decreases with the increase of the velocity ratio. As a result, we conclude that a higher velocity ratio is preferable to reduce the skin friction of the train. Besides, with the increase of velocity ratio, the dimensionless frequency St of the high-energy coherent structure does not change obviously and St = 3.09 × 10−4–4.51 × 10−4.

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“…Figure9: Comparison of pressure distribution on the circular cylinder due to Newtonian, Shear thinning, Shear thickening fluid flow using LBM studies, and the literature Wu et al[25] and Bertin and Smith[24] along with potential fluid flow, i.e., C p = 1 − 4 sin 2 (θ).…”

mentioning

confidence: 99%

Modelling of Real Shear Thickening Fluid (STF) Flow around a Circular Cylinder within a Channel using the Lattice Boltzmann Method

Vishal,

Garg,

Sarkar

et al. 2024

Preprint

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A real shear thickening fluid (STF) exhibit a complex combination of Newtonian and non-Newtonian behavior, including shear thinning and shear thickening viscosity-shear rate profile. Understanding the flow dynamics of STFs through intricate geometries, particularly in confined spaces, is crucial for the development of impact-resistant systems. To explore the flow characteristics of the real shear thickening fluids over cylindrical surface confined in a channel, we employed the Lattice Boltzmann method (LBM) within a D2Q9 framework for mesoscopic numerical simulations. The velocity and pressure profiles has been explored to the limit so that effect of real STF can been explored. Our finding are focused on the real STF effects near the cylinder and how it varies with the Reynolds number. We find that the Real shear thickening fluids exhibit a complex changes in the wake flow pattern as compared to Newtonian, power-law shear-thinning and thickening fluids. In case of Real STF, due to low shear rates, we find thinning behaviour near the centerline of the channel (i.e., in the core) of the flow where the cylinder is placed. Hence, the vortex shedding and recirculation is less intense as compare to the power-law Shear Thickening Fluid (STF) and Newtonian flows. We also find that the Real shear thickening fluid flow is more accelerated onto the cylinder and exhibit early separation as compared to the thickening or Newtonian fluid, thereby creates more pressure drag as compared to the Newtonian and pure power-law thickening fluids, whereas due to low viscosity onto the cylinder it creates less skin drag as compared to the Newtonian and pure power-law thickening fluids.

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Mean pressure distributions around a circular cylinder in the branch of a T-junction with/without vanes

Cited by 17 publications

References 29 publications

Numerical Simulation of Non-Isothermal Mixing Flow Characteristics with ELES Method

Numerical Simulation of Non-Isothermal Mixing Flow Characteristics with ELES Method

Coherent Structure of Flow Based on Denoised Signals in T-junction Ducts with Vertical Blades

Modelling of Real Shear Thickening Fluid (STF) Flow around a Circular Cylinder within a Channel using the Lattice Boltzmann Method

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