Large eddy simulation studies on the influence of turbulent inlet conditions on the flow behavior in a mixing tee

Gauder, Patrick; Selvam, Parasuraman; Kulenovic, Rudi; Laurien, Eckart

doi:10.1016/j.nucengdes.2015.12.001

Cited by 16 publications

(4 citation statements)

References 18 publications

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“…The turbulence at the inlet does not seem to have significant effect on the bulk flow, whereas it influences the near-wall flow, i.e., the wall temperature fluctuation and the temperature-velocity correlation are moved downstream with reduced magnitude with the inclusion of turbulence at the inlet. Similar results were presented by Gauder et al (2016) through comparing the simulation results with and without turbulence at the inlets. Zhou et al (2018) carried out experiments to investigate the thermal mixing with varied temperature differences.…”

Section: Introductionsupporting

confidence: 78%

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An unsteady RANS study of thermal striping in a T-junction with sodium streams mixing at different temperatures

Duan

Huang

2023

Front. Energy Res.

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Thermal striping in a T-junction with sodium streams mixing at different temperatures is studied using unsteady Reynolds-averaged simulation (RANS). Different parameters including the momentum ratio of the streams (0.2–4.3), the temperature difference between the streams (15–35 K), and the bulk Reynolds number (5,000–9,000) are investigated. Simulation results demonstrate that the flow pattern is mainly determined by the momentum ratio, while the temperature difference and the bulk Reynolds number have little influence within the range considered. The location of the separation point of the recirculation zone increases with the momentum ratio while the location of the thermal front decreases with it. In addition, the sensitivity of the temperature fluctuations to a range of low-Reynolds-number turbulence models are studied, which demonstrate that the time-varying temperature fluctuations predicted by these turbulence models are significantly smaller than the experimental measurements. High-fidelity simulations which fully resolve the temperature fluctuations will be carried out as the future work to complement the statistics of the temperature fluctuation.

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Section: Introductionsupporting

confidence: 78%

“…Studies of thermal mixing in T-junctions have been reported by many authors (Lee et al, 2009;Walker et al, 2009;Ndombo and Howard, 2011;Gauder et al, 2016;Zhou et al, 2018). The complex features such as secondary flow, separation, recirculation, and reattachment have been investigated.…”

Section: Introductionmentioning

confidence: 99%

An unsteady RANS study of thermal striping in a T-junction with sodium streams mixing at different temperatures

Duan

Huang

2023

Front. Energy Res.

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“…For example, excessive thermal fatigue resulting from the turbulent mixing of fluids at differing temperatures can lead to a complete destruction of the system [12]. It is argued that thermal fatigue is the most common cause of unexpected failures within Nuclear Power Plants (NPP's) particularly within piping components such as mixing tee's [29]. Flows throughout complex piping geometries are highly unsteady and involve broad bandwidth, low frequency fluctuations that are poorly represented through standard URANS [31].…”

Section: Nuclear Applicationsmentioning

confidence: 99%

A Review of Embedded Large Eddy Simulation for Internal Flows

Holgate

Skillen

Craft

et al. 2018

Arch Computat Methods Eng

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When scale-resolving simulation approaches are employed for the simulation of turbulent flow, computational cost can often be prohibitive. This is particularly true for internal wall-bounded flows, including flows of industrial relevances which may involve both high Reynolds number and geometrical complexity. Modelling the turbulence induced stresses (at all scales) has proven to lack requisite accuracy in many situations. In this work we review a promising family of approaches which aim to find a compromise between cost and accuracy; hybrid RANS-LES methods. We place particular emphasis on the emergence of embedded large eddy simulation. These approaches are summarised and key features relevant to internal flows are highlighted. A thorough review of the application of these methods to internal flows is given, where hybrid approaches have been shown to offer significant benefits to industrial CFD (relative to an empirical broadband modelling of turbulence). This paper concludes by providing a cost-analysis and a discussion about the emerging novel use-modalities for hybrid RANS-LES methods in industrial CFD, such as automated embedded simulation and multi-dimensional coupling.

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“…Many experimental [7][8][9], numerical [10][11][12][13], and combinations of both [14][15][16][17] research have been conducted by many researchers all over the world to investigate the thermal mixing characteristics and mixing performance of T-junction. There are some identified factors such as Tjunction's geometry, inclination angle between a branch and main pipe, diameter ratio, inlet temperature difference, velocity ratio, mass flow rate, etc.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Thermal Mixing Characteristics of Fluids Flowing Through a Converging T-junction

Nuruzzaman

Pao

et al. 2021

CFDL

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Temperature fluctuation occurs while mixing of hot and cold fluids in a T-junction due to incomplete thermal mixing. This temperature fluctuation can produce thermal fatigue at the weld area of the T-junction. The present study aims to numerically investigate the thermal mixing characteristics of hot and cold fluids in a T-junction. The realizable k-ε turbulence model is used with natural gas as the working fluid. Temperature distribution, mixing quality, and intensity of temperature fluctuation are evaluated and compared along with the mixing outlet. The inlet temperature difference and branch to main pipe flowrate ratio have a direct influence on thermal mixing. The higher temperature difference can reduce the thermal mixing performance. Thermal mixing increases with the increase of branch to main pipe flowrate. The intensity of temperature fluctuation is found within a short distance from the intersecting point of the two inlets. With the increase of distance along with the mixing outlet, the frequency of temperature fluctuation decreases, and thermal mixing increases.

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Large eddy simulation studies on the influence of turbulent inlet conditions on the flow behavior in a mixing tee

Cited by 16 publications

References 18 publications

An unsteady RANS study of thermal striping in a T-junction with sodium streams mixing at different temperatures

An unsteady RANS study of thermal striping in a T-junction with sodium streams mixing at different temperatures

A Review of Embedded Large Eddy Simulation for Internal Flows

Simulation Analysis of Thermal Mixing Characteristics of Fluids Flowing Through a Converging T-junction

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