VVER-1000 Coolant Transient Benchmark - OECD Nuclear Energy ...

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PARTICIPANT-PROVIDED COMPUTATION DETAILS – CFD CODES Discretisation? Unstructured, 10 000 000 control volumes. Turbulence model? Large Eddy Simulation (LES). Advection scheme? High resolution. Other assumptions, if any? Extended domain of solution to include part of the core. Have you performed mesh refinement analysis? If yes, what are your conclusions? Yes. Unstructured mesh with the above number of cells is found adequate. Have you compared the performance of different turbulence models? If yes, what are your conclusions? No. EREC (REMIX v. 1.0) Organisation name? Electrogorsk Research and Engineering Center, (EREC), Russia. Code? REMIX v. 1.0. Have you used plant specific geometry for the reactor vessel and internals? Yes. Discretisation? Unstructured mesh with hexahedral cells, body-fitted, 311 394 cells, 332 940 vertices. The domain of solution consists of the following regions: four inlet pipes, downcomer, elliptic bottom (equivalent porosity 0.2 in vertical direction and 0 in lateral directions), lower plenum (porosity 0.8), and core up to 3 m elevation (porosity 0.526). Turbulence model? k-epsilon model with wall functions, lateral turbulent diffusion was suppressed in porous regions (perforated elliptical bottom, support columns in the lower plenum, core inlet). Advection scheme? Upwind. Other assumptions, if any? N/A Have you performed mesh refinement analysis? If yes, what are your conclusions? No. Have you compared the performance of different turbulence models? If yes, what are your conclusions? No. 114 V1000CT-2: SUMMARY RESULTS OF EXERCISE 1 ON VESSEL MIXING SIMULATION – © OECD/NEA 2010
FZD (ANSYS CFX 10) Organisation name? Forschung Zentrum Dresden, Germany. Code? ANSYS CFX 10. Have you used plant specific geometry for the reactor vessel and internals? Yes. Discretisation? Unstructured, 4 700 000 cells. Turbulence model? Shear Stress Transport (SST). Advection scheme? Upwind. Other assumptions, if any? Have you performed mesh refinement analysis? If yes, what are your conclusions? Yes. PARTICIPANT-PROVIDED COMPUTATION DETAILS – CFD CODES Have you compared the performance of different turbulence models? If yes, what are your conclusions? Yes, SST, DES and LES in CFX 10. Best performance in terms of mixing scalar was achieved with DES, see Hoehne (2007a). FZK (CFX 5.7.1) Organisation name? Forschung Zentrum Karlsruhe, Germany. Code? CFX 5.7.1. Have you used plant specific geometry for the reactor vessel and internals? Yes, CAD geometry data as prepared by Bieder/CEA and grid of the downcomer/lower plenum by Bieder/CEA. Discretisation? The whole reactor vessel was modelled with 14 000 000 cells, of which 2.6 Mio in the downcomer and lower plenum; core 800 000; upper plenum 9.6 Mio. The core was modelled with structured mesh (hexagonal cells), everything else with unstructured/hybrid mesh (inlets, downcomer and lower plenum – tetra cells). V1000CT-2: SUMMARY RESULTS OF EXERCISE 1 ON VESSEL MIXING SIMULATION – © OECD/NEA 2010 115
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Nuclear Science ISBN 978-92-64-9915
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Foreword FOREWORD The Nuclear Energ
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Table of contents TABLE OF CONTENTS
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List of tables LIST OF TABLES 1.1 L
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LIST OF FIGURES 4.34 CEA TRIO_U and
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List of abbreviations ANS American
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INTRODUCTION 1.2 Exercise 2 - Compu
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THE INVESTIGATED MIXING PROBLEM •
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THE INVESTIGATED MIXING PROBLEM Fig
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Chapter 3: Methodology of compariso
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Chapter 4: CFD results and discussi
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Temperature, K Temperature, K Figur
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CFD RESULTS AND DISCUSSION Figure 4
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4.4.3 Radial distributions at the c
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Temperature, K Figure 4.4: Downcome
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Velocity at 5 800 mm (m/s) Figure 4
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Figure 4.10: EREC REMIX results - a
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Figure 4.14: FZK CFX 5 results - an
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Figure 4.18: BUTE CFX 10 results -
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Figure 4.22: Assembly-by-assembly c
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Temperature deviations, K Temperatu
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Velocity, m/s Velocity, m/s Figure
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COARSE MESH RESULTS 5.2 Final state
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Page 66 and 67: CFD RESULTS AND DISCUSSION Table 5.
Page 68 and 69: COARSE MESH RESULTS Velocity at 5 8
Page 70 and 71: COARSE MESH RESULTS Figure 5.6: INR
Page 72 and 73: COARSE MESH RESULTS Figure 5.10: KU
Page 74 and 75: COARSE MESH RESULTS Figure 5.14: UN
Page 76 and 77: COARSE MESH RESULTS Figure 5.17: De
Page 78 and 79: COARSE MESH RESULTS Temperature dev
Page 88 and 89: COARSE MESH RESULTS Figure 5.40: As
Page 90 and 91: COARSE MESH RESULTS Temperature, K
Page 98 and 99: COARSE MESH RESULTS Flow rate, kg/s
Page 101 and 102: Chapter 6: Summary and conclusions
Page 103 and 104: References REFERENCES ANSYS (2010a)
Page 105 and 106: CFX 10 (FZK, FZD, BUTE, UNIPI) Appe
Page 107 and 108: DESCRIPTION OF CFD CODES millions o
Page 109 and 110: CATHARE2 (INRNE) Appendix B: Descri
Page 111: DESCRIPTION OF SYSTEM CODES The rea
Page 116 and 117: PARTICIPANT-PROVIDED COMPUTATION DE
Page 123 and 124: INRNE (CATHARE 2.5) I. Vessel therm
Page 125 and 126: PSU (TRACE) I. Vessel thermal-hydra
Page 127: II. Core thermal-hydraulic model 1.
Page 130 and 131: DEVIATIONS OF CFD COMPUTED-TO-EXPER
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Page 139 and 140: *89 -0.38 *62 3.46 103 -0.40 76 4.3
Page 141: *89 -0.98 *62 7.73 103 -0.84 76 8.9
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