Large eddy simulation of thermal mixing with conjugate heat transfer at BWR operating conditions
Authors:
- Mattia Bergagio ,
- Wenyuan Fan,
- Roman Thiele,
- Henryk Anglart
Abstract
Thermal fatigue occurs in most metals under cyclic heat loads and can threaten the structural integrity of metal parts. Detailed knowledge of these loads is of utter importance to prevent such issues. In this study, a large eddy simulation (LES) with wall-adapting local eddy viscosity (WALE) subgrid model is performed to better understand turbulent thermal mixing in an annulus with a pair of opposing cold inlets at a low axial level () and with a pair of opposing hot inlets at a higher axial level (). Each inlet pair is 90° from each other in the azimuthal direction. Conjugate heat transfer between fluid and structure is accounted for. The geometry simplifies a control-rod guide tube (CRGT) in a boiling water reactor (BWR). LES results are compared with measurement data. This is one of the first times BWR conditions are met in both experiments and LES: pressure equals 7.2 MPa, while the temperature difference between hot and cold inlets reaches 216 K. LES temperatures at the fluid-structure interface are fairly correlated with their experimental equivalents, with regard to mean values, local variances, and dangerous oscillation modes in fatigue-prone areas (). An elastic analysis of the structure is performed to evaluate stress intensities there. From them, cumulative fatigue usage factors (CUFs) are estimated and used as screening criteria in the subsequent frequency analysis of temperature time series at the fluid-structure interface. The likelihood of initiating a fatigue crack is linked to the maximum CUF, which is 3.2 × 10−5 for a simulation time of .
- Record ID
- WUT5d80baca77954bac803049230a6453e9
- Author
- Journal series
- Nuclear Engineering and Design, ISSN 0029-5493, e-ISSN 1872-759X
- Issue year
- 2020
- Vol
- 356
- Pages
- 1-19
- Publication size in sheets
- 5518.05
- Keywords in English
- Turbulent mixing Conjugate heat transfer LES WALE SGS model High cycle thermal fatigue
- Keywords in original language
- Turbulent mixing Conjugate heat transfer LES WALE SGS model High cycle thermal fatigue
- ASJC Classification
- ; ; ; ; ;
- DOI
- DOI:10.1016/j.nucengdes.2019.110361 Opening in a new tab
- URL
- https://reader.elsevier.com/reader/sd/pii/S0029549318311300?token=EF9589DFD9715105E3E8751CA8E3CC98C0387467B7F55737A98489D65B29F22278FB1A405BAAEE353E5C01DD1D35EC81 Opening in a new tab
- Language
- (en) English
- File
-
- File: 1
- H.Anglart 2019 2-main.pdf
-
- Score (nominal)
- 100
- Score source
- journalList
- Score
- = 100.0, 07-05-2022, ArticleFromJournal
- Publication indicators
- = 1; = 1; : 2016 = 1.334; : 2020 (2 years) = 1.869 - 2020 (5 years) =1.837
- Uniform Resource Identifier
- https://repo.pw.edu.pl/info/article/WUT5d80baca77954bac803049230a6453e9/
- URN
urn:pw-repo:WUT5d80baca77954bac803049230a6453e9
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or PerishOpening in a new tab system.