Large eddy simulation of mixing between hot and cold sodium flows - comparison with experiments

Simoneau, J.P.; Noe, H.; Menant, B.

doi:10.2172/107780

Cited by 3 publications

(2 citation statements)

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“…Using coarser grids is a dangerous simplification, because multi-purpose codes have non-negligible numerical diffusion. This may lead on coarse grids to time-independent results, as observed with the first Tjunction calculations (113). A reduction of the problem to two dimensions is also found; e.g.…”

Section: Experiences and Open Problemssupporting

confidence: 62%

Direct numerical and large eddy simulations in nuclear applications

Grötzbach

Wörner

1999

International Journal of Heat and Fluid Flow

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Direct numerical and large eddy simulations are powerful tools for analyses of turbulent flows at low, respectively large Reynolds or Rayleigh numbers in fundamental research. The current status of both methods and recent extensions are compiled. The progress achieved with subgrid scale models and numerics makes the method attractive for applications to nuclear research and engineering. Examples of realistic technical flows are discussed. Open problems are mainly related to more general subgrid scale models for large complex containers, to the wall and inlet conditions for high Reynolds number and buoyant flows, and to discretisation schemes for local refinement of spatial resolution. As a classical example for the use of direct simulations, results are presented for a turbulent internally heated horizontal fluid layer. The analysis of the closure terms in the transport equation of the kinetic energy demonstrates major difficulties of the conventional statistical modelling for partially stably stratified convection.

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Section: Experiences and Open Problemssupporting

confidence: 62%

Direct numerical and large eddy simulations in nuclear applications

Grötzbach

Wörner

1999

International Journal of Heat and Fluid Flow

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“…In order to study the relationship between temperature and crack, various experiments have been conducted for temperature fluctuation in the mixing tees. For example, Simoneau et al [3] and Wakamatsu et al [4] have conducted a scaled model experiment related to Civaux 1. Furthermore, water experiments (WATLON) have been conducted by Kamide et al [5] in the Japan Atomic Energy Agency (JAEA) to study the mixing behavior in tee pipes using particle image velocimetry (PIV) and thermocouples.…”

Section: Introductionmentioning

confidence: 99%

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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Large Eddy Simulation of Mixing in the Outlet Plenum of a High Temperature Reactor: A Benchmark Exercise

Simoneau¹,

Champigny²

2004

12th International Conference on Nuclear Engineering, Volume 1

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This paper is related to the validation of the CFD codes in the frame of High Temperature Reactor studies. A code to code benchmark involving complex unsteady flows in the outlet plenum is proposed and the Large Eddy Simulation technique is retained. The paper presents the benchmark conditions, the results obtained by the Star-cd software used in Framatome-ANP and the comparison with the Trio-U code (from CEA) and the literature. It presents the advantages of such fine unsteady calculations and mainly highlights the coherence between both analyses.

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Large eddy simulation of mixing between hot and cold sodium flows - comparison with experiments

Cited by 3 publications

References 0 publications

Direct numerical and large eddy simulations in nuclear applications

Direct numerical and large eddy simulations in nuclear applications

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

Large Eddy Simulation of Mixing in the Outlet Plenum of a High Temperature Reactor: A Benchmark Exercise

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