Modelling of turbulent effects in LOCA conditions with CATHARE-3

Torsti Alku

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Rising computational capabilities have allowed for the possibility of more complex thermal hydraulic safety codes. One of these branches of advancement is to start using three dimensional solvers in system codes instead of one dimensional. CATHARE-2 already included a 3D module, but within the EDF and CEA NEPTUNE project started in 2001 the 3D solver, as a part of CATHARE-3, has been modified to be more versatile and at the same time faster.Moving from one dimensional solvers to three dimensional poses issues due to the added degrees of freedom. In a 3D solver terms describing turbulence appear in the equations due to the time and space averaging inherent to the field equations which need to be taken into account.Within the NURESAFE program turbulence models have been added to the 3D module of CATHARE-3. In this paper the sensitivity of simulation results to the different turbulence models and level of detail in meshing have been studied. For this purpose simulations of boil-up and reflooding experiments performed at the PERICLES 2D facility were carried out.The results show that the turbulence models do cause change in the results. With sub channel level meshing they are visible, while with channel level meshing turbulence modelling has minimal effect.
Original languageEnglish
Pages (from-to)258-265
Number of pages8
JournalNuclear Engineering and Design
Volume321
DOIs
Publication statusPublished - 1 Sep 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Loss of coolant accidents
turbulence models
Turbulence models
turbulence
Turbulence
modules
Codes (standards)
modeling
hydraulics
safety
simulation
degrees of freedom
Hydraulics
causes
sensitivity
effect
Experiments
experiment

Keywords

  • degrees of freedom (mechanics)
  • turbulence
  • turbulence models
  • CATHARE
  • computational capability
  • level of detail
  • minimal effects
  • reflooding
  • thermal hydraulics
  • three-dimensional solvers
  • turbulent effects
  • 3D

Cite this

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title = "Modelling of turbulent effects in LOCA conditions with CATHARE-3",
abstract = "Rising computational capabilities have allowed for the possibility of more complex thermal hydraulic safety codes. One of these branches of advancement is to start using three dimensional solvers in system codes instead of one dimensional. CATHARE-2 already included a 3D module, but within the EDF and CEA NEPTUNE project started in 2001 the 3D solver, as a part of CATHARE-3, has been modified to be more versatile and at the same time faster.Moving from one dimensional solvers to three dimensional poses issues due to the added degrees of freedom. In a 3D solver terms describing turbulence appear in the equations due to the time and space averaging inherent to the field equations which need to be taken into account.Within the NURESAFE program turbulence models have been added to the 3D module of CATHARE-3. In this paper the sensitivity of simulation results to the different turbulence models and level of detail in meshing have been studied. For this purpose simulations of boil-up and reflooding experiments performed at the PERICLES 2D facility were carried out.The results show that the turbulence models do cause change in the results. With sub channel level meshing they are visible, while with channel level meshing turbulence modelling has minimal effect.",
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Modelling of turbulent effects in LOCA conditions with CATHARE-3. / Alku, Torsti.

In: Nuclear Engineering and Design, Vol. 321, 01.09.2017, p. 258-265.

Research output: Contribution to journalArticleScientificpeer-review

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