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GOTHIC: Overview

GOTHIC: Overview . TL George Numerical Applications, Inc. GOTHIC 7.2. General Purpose Thermal-Hydraulic Analysis Special Modeling Features for Containment Building Modeling Ongoing Development and Maintenance Support by the EPRI GOTHIC Enhancement Project (since 1993). Multi-Zone Modeling.

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GOTHIC: Overview

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  1. GOTHIC: Overview TL George Numerical Applications, Inc

  2. GOTHIC 7.2 • General Purpose Thermal-Hydraulic Analysis • Special Modeling Features for Containment Building Modeling • Ongoing Development and Maintenance Support by the EPRI GOTHIC Enhancement Project (since 1993).

  3. Multi-Zone Modeling • Combine Lumped and Subdivided Volumes • Superimposed Conductors • Finite Volume Solution • Semi-explicit • Implicit Boundary Conditions F Lumped Volumes Junctions P SubdividedVolume Components Thermal Conductors

  4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pool Multiphase/Multicomponent • Vapor • Steam • N Gas Components • Drops • Liquid • Films • Pools • Slugs • Mist • Ice Lumped Subdivided

  5. Equation Set

  6. Air Bubble CondensingSteamBubbles Water SteamInjection Interphase Heat and Mass Transfer • Evaporation • Condensation • Diffusion Layer Model for Noncondensing Gas Effects • Boiling/Flashing • Drop Entrainment • Drop Deposition • Ice Melt

  7. Wall Heat Transfer and Condensation • Free Convection • Forced Convection • Radiation • Wall - Steam • Wall - Wall • Condensation • Uchida • Tagami • Gido-Koestel • Mist/DiffusionLayer Model • 1D and 2D Conduction

  8. Mixing Vent • Buoyant Flows • Forced Convection • Jet Induced Mixing • Diffusion • Molecular • Turbulent - k-e Model • Mass Diffusion - Vapor • Thermal Diffusion - Vapor/Liquid • Momentum Diffusion - Vapor/Liquid Steam Plume Source

  9. z x Hydrogen Combustion Y=0 • Recombiners • Lumped Parameter • HECTR Model • User Specified Propagation • Subdivided Volume • Calculated Propagation • Laminar • Turbulent • Eddy Diffusivity Model Igniter Y=Mid 3D H2 Burn in a Box

  10. Equipment Models • Pumps/Fans • Valves • Vacuum Breakers • Heat Exchangers • Fan Coolers • Igniters • Recombiners • Heaters/Coolers • Spray Nozzles • Controls • Trips • Forcing Function • Control Systems

  11. Piping and Duct Networks • Networks Consist of Links and Nodes • Full Implicit Solution • Two-phase Homogenous Equilibrium Flow • Heat Addition/Extraction at Nodes • Connect to • Lumped Volumes • Subvolumes • Boundary Conditions Tank System Ventilation

  12. Subdivided Volumes • Volume and Area Porosity Factors to Model Obstructions and Irregular Boundaries • Slip/No-Slip Boundaries • Easy User Interface

  13. 3D Connectors • Connect Subdivided Volumes to • Lumped Volumes • Subdivided Volumes • Embedded Grids • Full 3D Momentum Solution • Diffusion Across Connection 3D Connectors at interfacebetween coarse and finegrids.

  14. Multiple Detail Levels

  15. Tv . . . . . Tsat . . . . . . . . . . . . . . . . . . Subcooling y dm Advanced Wall Condensation Model • Sensible Heat Transfer • Free Convection • Forced Convection • Radiation to Steam • Mass Transfer • Mass Transfer Coefficient from Heat/Mass Transfer Analogy • Mist Formation in the Boundary Layer

  16. Comprehensive Drop Behavior Models • Drop Breakup • Hydrodynamic Forces • Flashing • General Entrainment Model • Relative Velocity • Film/Pool Thickness • Fluid Properties • Depositions Models • Diffusion • Turbulent Impaction • Bends WALE Test Drop Concentration

  17. Solution Methods • Conductor Solution • Full implicit finite volume • Fluids Solution • Semi-implicit finite volume • Full-implicit finite volume • 1st and 2nd order upwind differencing options • Multigrid, Conjugate Gradient, Block Iterative and Direct Matrix solution options.

  18. Applications • Heating and Cooling • Forced Convection • Natural Convection • Radiation • Evaporation and Condensation • Boiling • HVAC system performance

  19. Applications • EQ Analysis • EQ Environment • Thermal Lag • Room Heatup • Containment Pressure and Temperature • Line Breaks in Auxiliary Buildings • Multiphase Flow in Piping Systems • Water Hammer • Cooler Performance

  20. Applications • Hydrogen • Distribution • Recombiners • Burn • Spent Fuel Pool Performance • Hydrodynamic Loads on Equipment • Hazardous Gas Migration • Special Investigations …

  21. Assessment • Current Test Matrix Includes 204 Tests • 96 Functional Tests • 53 Comparison with Analytic Results • 22 Separate Effects Experiments • 32 Combined Effects Experiments • Includes 4 from International Standard Problems

  22. Enhancements in Progress • Tracked component in the liquid phase • Liquid component • Solid particles with settling • Multiple drop fiel • Parallel Processing • Distributed computing on multinode system for faster run speed • Additional Assessment

  23. Quality Assurance • GOTHIC is maintained under NAI’s QA Program. • Conformance to 10CFR50 Appendix B requirements. • Meets intent of ASME NQA-1 • Built in QA features • Event Logging • File Comparison Utility

  24. More Information • www.numerical.com • Animations for CFD simulations

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