RANS analyses on erosion behavior of density stratification consisted of helium–air mixture gas by a low momentum vertical buoyant jet in the PANDA test facility, the third international benchmark exercise (IBE-3)

Abstract Density stratification in the reactor containment vessel is an important phenomenon on an issue of hydrogen safety. The Japan Atomic Energy Agency (JAEA) has started the ROSA-SA project on containment thermal hydraulics. As a part of the activity, we participated in the third international CFD benchmark exercise (IBE-3) focused on density stratification erosion by a vertical buoyant jet in containment vessel. This paper shows our approach for the IBE-3, focusing on the turbulence transport phenomena in eroding the density stratification and introducing modified turbulence models for improvement of the CFD analyses. For this analysis, we modified the CFD code OpenFOAM by using two turbulence models; the Kato and Launder modification to estimate turbulent kinetic energy production around a stagnation point, and the Katsuki model to consider turbulence damping in density stratification. As a result, the modified code predicted well the experimental data. The importance of turbulence transport modeling is also discussed using the calculation results.

[1]  Yoshihide Tominaga,et al.  Numerical simulation of dispersion around an isolated cubic building: Comparison of various types of k–ɛ models , 2009 .

[2]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .

[3]  Masahiro,et al.  A Study on Improvement of RANS Analysis for Erosion of Density Stratified Layer of Multicomponent Gas by Buoyant Jet in a Containment Vessel , 2015 .

[4]  Yoshizawa.  Statistical analysis of compressible turbulent shear flows with special emphasis on turbulence modeling. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[5]  Domenico Paladino,et al.  PANDA: A Multipurpose Integral Test Facility for LWR Safety Investigations , 2012 .

[6]  E.M.J. Komen,et al.  Validation of a FLUENT CFD model for hydrogen distribution in a containment , 2012 .

[7]  WIND TUNNEL EXPERIMENT AND NUMERICAL SIMULATION OF ATMOSPHERIC BOUNDARY LAYER UNDER VARIOUS ATMOSPHERIC STABILITY , 2009 .

[8]  J. Turner,et al.  Jets and plumes with negative or reversing buoyancy , 1966, Journal of Fluid Mechanics.

[9]  Brian Launder,et al.  On the Computation of Convective Heat Transfer in Complex Turbulent Flows , 1988 .

[10]  E. Studer,et al.  Interaction of a light gas stratified layer with an air jet coming from below: Large scale experiments and scaling issues , 2012 .

[11]  Akira Yoshizawa,et al.  Simplified statistical approach to complex turbulent flows and ensemble‐mean compressible turbulence modeling , 1995 .

[12]  B. Launder,et al.  Application of the energy-dissipation model of turbulence to the calculation of flow near a spinning disc , 1974 .

[13]  Dominique Laurence,et al.  New low-Reynolds-number k-ε model including damping effect due to buoyancy in a stratified flow field , 1996 .

[14]  A. Gosman,et al.  Solution of the implicitly discretised reacting flow equations by operator-splitting , 1986 .

[15]  A. Yoshizawa.  Statistical modeling of turbulent thermally buoyant flows , 1986 .

[16]  B. Končar,et al.  Analysis of heat transfer and flow characteristics in turbulent impinging jet , 2011 .

[17]  Guillaume Mignot,et al.  Large Scale Gas Stratification Erosion by a Vertical Helium-Air Jet , 2014 .

[18]  M. Kato.  The modeling of turbulent flow around stationary and vibrating square cylinders , 1993 .

[19]  J. P. Magnaud,et al.  International standard problem on containment thermal-hydraulics ISP47 Step 1—Results from the MISTRA exercise , 2007 .

[20]  F. Ogino,et al.  An experimental study of vertical turbulent jet with negative buoyancy , 1982 .