Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Numerical simulation of air discharged in subcooled water pool

  • Y. Cordova (Instituto Universitario de Ingeniería Energetica, Universitat Politecnica de Valencia (UPV)) ;
  • D. Blanco (Instituto Universitario de Ingeniería Energetica, Universitat Politecnica de Valencia (UPV)) ;
  • Y. Rivera (Instituto Universitario de Ingeniería Energetica, Universitat Politecnica de Valencia (UPV)) ;
  • C. Berna (Instituto Universitario de Ingeniería Energetica, Universitat Politecnica de Valencia (UPV)) ;
  • J.L. Munoz-Cobo (Instituto Universitario de Ingeniería Energetica, Universitat Politecnica de Valencia (UPV)) ;
  • A. Escriva (Instituto Universitario de Ingeniería Energetica, Universitat Politecnica de Valencia (UPV))
  • Received : 2023.03.31
  • Accepted : 2023.06.25
  • Published : 2023.10.25
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Abstract

Turbulent jet discharges in subcooled water pools are essential for safety systems in nuclear power plants, specifically in the pressure suppression pool of boiling water reactors and In-containment Refueling Water Storage Tank of advanced pressurized water reactors. The gas and liquid flow in these systems is investigated using multiphase flow analysis. This field has been extensively examined using a combination of experiments, theoretical models, and Computational Fluid Dynamics (CFD) simulations. ANSYS CFX offers two approaches to model multiphase flow behavior. The non-homogeneous Eulerian-Eulerian Model has been used in this work; it computes global information and is more convenient to study interpenetrated fluids. This study utilized the Large Eddy Simulation Model as the turbulence model, as it is better suited for non-stationary and buoyant flows. The CFD results of this study were validated with experimental data and theoretical results previously obtained. The figures of merit dimensionless penetration length and the dimensionless buoyancy length show good agreement with the experimental measurements. Correlations for these variables were obtained as a function of dimensionless numbers to give generality using only initial boundary conditions. CFD numerical model developed in this research has the capability to simulate the behavior of non-condensable gases discharged in water.

Keywords

Acknowledgement

This work was supported by the project THAIS co-financed by the CSN (Nuclear Safety Council of Spain) and the UPV (Polytechnical University of Valencia). The authors also would like to express gratitude to the Generalitat Valenciana (Spain) for its support under the Santiago Grisolia Program/2018/140.

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