A CFD benchmarking exercise based on flow mixing in a T-junction

Smith, Brian L.; Mahaffy, J.H.; Angele, Kristian

doi:10.1016/j.nucengdes.2013.02.030

Cited by 61 publications

(20 citation statements)

References 6 publications

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“…Therefore, it is highly relevant in the context of aging and the life time management of a nuclear power plant. In the last decade, several efforts have been made for the assessment of thermal fatigue (Braillard et al, 2006;Chapuliot et al, 2005;Coste et al, 2008;Fontes et al, 2009;Kamide et al, 2009;Smith et al, 2013). The generic configuration that is mostly considered is the T-junction, where the mixing of two separate hot and cold streams occur immediately downstream of the T-junction.…”

Section: Introductionmentioning

confidence: 99%

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Thermal mixing in a T-junction: Novel CFD-grade measurements of the fluctuating temperature in the solid wall

Braillard

Howard

Angele

et al. 2018

Nuclear Engineering and Design

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A B S T R A C TThis article reports new experiments performed with the purpose of generating novel data of the fluctuating temperature inside the solid in the mixing region between hot and cold water in a T-junction. This data has been measured using a novel sensor (coefh) developed at the Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA) in Cadarache, France. These experiments are performed within the framework of the MOTHER project. The main objective of the MOTHER project is to validate various CFD approaches (such as LES, Hybrid i.e. RANS/LES and RANS) for transient heat transfer in a T-junction configuration including the pipe wall. Hence, the performed experiments have focused on accurately measuring and documenting the boundary conditions to be able to have a well-defined database for CFD validation. The tests are performed for two different Reynolds numbers 40000 and 60000 and for two different T-junction geometries; a sharp corner and a round corner.

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Section: Introductionmentioning

confidence: 99%

“…In the recent past, an attempt was made to evaluate the accuracy in the CFD predictions such thermal fluctuations in the form of the OECD CFD Benchmark for the Vattenfall T-junction configuration (Smith et al, 2013). The considered configuration was based on adiabatic walls.…”

Section: Introductionmentioning

confidence: 99%

Thermal mixing in a T-junction: Novel CFD-grade measurements of the fluctuating temperature in the solid wall

Braillard

Howard

Angele

et al. 2018

Nuclear Engineering and Design

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“…The organization for economic co-operation and development/nuclear energy agency (OECD/NEA) Vattenfall T-junction Benchmark was initiated to test the ability of state-of-the-art computational fluid dynamics (CFD) codes to predict the important parameters affecting high cycle thermal fatigue in mixing tees. T-junction mixing experiments have been conducted at a number of facilities in France, Germany, Sweden, Japan, and Switzerland, but previously unreleased test data became available from tests carried out in November 2008 at the Älvkarleby laboratory of Vattenfall Research and Development in Sweden reported by Unclassified Committee On The Safety Of Nuclear Installations (NEA/CSNI/R (2011)5) [34].…”

Section: Introductionmentioning

confidence: 99%

“…Following the earlier results reported in the literature [34], LES approach with Smagorinsky Lilly sub-grid scale model (SGS) is adopted in the current study. Although predictions LES for Vattenfall T-junction using the FLUENT commercial code exist in the literature [34,35], a comparison is made with experimental data to evaluate if the grid resolution adopted in this study is sufficient to predict the mean and fluctuating variables with sufficient accuracy. After this validation step, an LES simulation is conducted to evaluate the performance of the swirl velocity at the inlet of mean pipe and its impact on the distribution of the flow field and temperature fluctuations downstream of the T-junction.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of thermal turbulent mixing and reduction of temperature fluctuations with swirl in T-junction

Benyamina

Knyazkov²,

Imine

2017

J Braz. Soc. Mech. Sci. Eng.

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Turbulent mixing of two fluids having a temperature difference can lead to temperature fluctuations in the T-junctions, particularly in the primary cooling circuit of nuclear power plants. Temperature changes produce thermal stresses causing thermal fatigue. This is a key topic related to nuclear security. This article presents the numerical results of two thermal turbulent mixing simulations, applied to a T-junction (OECD-NEA-Vattenfall T-junction). These simulations apply, respectively, to the case of a flow with and without rotational movements into the cold side. The numerical predictions were made using the large eddy simulation with the commercial code Fluent. The numerical results obtained in the first case were compared with the available experimental data and were found in an agreement satisfactory to the profiles of average variables and the spectrum of the temperature near the wall. The comparison with RMS profiles was less satisfactory in the center of the main tube, but was of good quality in the near-wall region. In the second simulation, the main movement of the fluid is affected by the spiral paths created by the swirl velocity caused at the cold inlet, which improves the mixing of hot and cold fluids downstream of the T-junction. From the analysis of these results, it clearly appears that the temperature fluctuations decrease near the

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“…Firstly, characterization of thermal loads acting on structural components and the flow patterns that develop downstream of the T-junction have been possible by means of experimental facilities Smith et al, 2013). In particular, the Vattenfall benchmark facility (NEA/CSNI, 2011) was initially conceived for the development and validation of computational fluid dynamic (CFD) codes, mathematical approaches and turbulence models for the reliable simulation of fluid mixing phenomena.…”

Section: Introductionmentioning

confidence: 99%

Stress assessment in piping under synthetic thermal loads emulating turbulent fluid mixing

Garrido

Shawish

Cizelj

2015

Nuclear Engineering and Design

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A CFD benchmarking exercise based on flow mixing in a T-junction

Cited by 61 publications

References 6 publications

Thermal mixing in a T-junction: Novel CFD-grade measurements of the fluctuating temperature in the solid wall

Thermal mixing in a T-junction: Novel CFD-grade measurements of the fluctuating temperature in the solid wall

Large eddy simulation of thermal turbulent mixing and reduction of temperature fluctuations with swirl in T-junction

Stress assessment in piping under synthetic thermal loads emulating turbulent fluid mixing

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