The integration of thermal-hydraulics (CFD) and finite element (FEM) computer codes in liquid and solid mechanics (MULTIPHYSICS): MULTIPHYSICS summary report

Tellervo Brandt, Ville Lestinen, Timo Toppila, Jukka Kähkönen, Antti Timperi, Timo Pättikangas, Ismo Karppinen

Research output: Chapter in Book/Report/Conference proceedingChapter or book articleProfessional

Abstract

In this article, we study a large-break loss of coolant accident (LBLOCA) where a guillotine break of one of the main coolant pipes occurs near the reactor pressure vessel (RPV). This initiates a pressure wave which propagates inside the RPV. The simulation of bidirectional fluid-structure interaction phenomena has been found important for accurate prediction of the resulting deformation and loads. In this article, fully coupled simulation results are validated against the German HDR (Heißdampfreaktor) experiments. The computational fluid dynamic (CFD) software Fluent and Star-CD are applied to modeling of three-dimensional, viscous, turbulent fluid flow. The MpCCI code is used for bidirectional coupling of the CFD simulation to the structural solver Abaqus. Pressure boundary condition at the pipe break is obtained in a two-phase simulation with the system code APROS. Comparisons are made for break mass flow, wall pressure, displacement and strain. The simulation results follow the experimental data fairly well. The sensitivity of the results to pressure boundary condition and water temperature is studied. In addition, the necessity of using bidirectional coupling instead of one-way pressure mapping is demonstrated.
Original languageEnglish
Title of host publicationSAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010
Subtitle of host publicationInterim Report
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages249-260
ISBN (Electronic)978-951-38-7267-0
ISBN (Print)978-951-38-7266-3
Publication statusPublished - 2009
MoE publication typeNot Eligible

Publication series

SeriesVTT Tiedotteita - Research Notes
Number2466
ISSN1235-0605

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    Brandt, T., Lestinen, V., Toppila, T., Kähkönen, J., Timperi, A., Pättikangas, T., & Karppinen, I. (2009). The integration of thermal-hydraulics (CFD) and finite element (FEM) computer codes in liquid and solid mechanics (MULTIPHYSICS): MULTIPHYSICS summary report. In SAFIR2010: The Finnish Research Programme on Nuclear Power Plant Safety 2007-2010: Interim Report (pp. 249-260). VTT Technical Research Centre of Finland. VTT Tiedotteita - Research Notes, No. 2466 http://www.vtt.fi/inf/pdf/tiedotteet/2009/T2466.pdf