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CartaBlanca Update

CartaBlanca Update. Xia Ma, Brian VanderHeyden, Paul Giguere, Qisu Zou, Duan Zhang Fluid Dynamics Group Theoretical Division Los Alamos National Laboratory March 21, 2006. Los Alamos National Laboratory Wins Four 2005 R&D 100 Awards.

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CartaBlanca Update

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  1. CartaBlanca Update Xia Ma, Brian VanderHeyden, Paul Giguere, Qisu Zou, Duan Zhang Fluid Dynamics Group Theoretical Division Los Alamos National Laboratory March 21, 2006

  2. Los Alamos National Laboratory Wins Four 2005 R&D 100 Awards CartaBlanca:A High-Efficiency,Object-Oriented, General-PurposeComputer Simulation Environment MESA:Measuring Enzyme-Substrate Affinities nanoFOAM:A Metal-Nanofoam Fabrication Technique NESSUS:Probabilistic Analysis Software Submitted by Southwest Research Institute and Los Alamos National Laboratory

  3. Multiphase flows. Chemical reactions. Multi-material deformation with mechanical strength. Fluid-structure interactions. Built-in thread parallelization in shared memory machines. Easy parallelization in distributed memory machines. Portability (The same code runs on Windows, Mac and UNIX machines). Capabilities of CartaBlanca • A high-efficiency, general-purpose multiphase multi-physics computer simulation package. • Written in developer-friendly Java Language in object-oriented fashion. • Based on advanced multiphase flow theory.

  4. Current Project Work High explosives safety Constitutive relation for high explosives. Nuclear reactor safety Turbulent two-phase flows Removable barrier Projectile Target interactions Received R&D 100 award 2005. Improved Parallel calculations, especially for particle methods. Enhanced quality control  Long tests Improved Graphic User Input (GUI) package Draft Theory, programmer and user manuals Implemented robust advection schemes Added temperature effects in Johnson-Cook model Implemented multi-material in phase capability. Improvements/Other Activities

  5. Two-phase flow in a nuclear reactor during an accident

  6. Grit HE up upt HE melt High temperature region High Explosives Safety • Drop-skid experiment • Ignition model for heated grit • Effect of skid plate heat conduction • One-step reactive kinetics • Effects of gas convection • Brittle damage

  7. Shock wave propagation in HE

  8. Parallel Operations • Obtained good scaling on shared memory. • Enhanced particle implementation. • Working on scaling on shared memory (JavaParty, MPI). Shock propagation on HE, using particle-in-cell method JavaParty behavior on shared and distributed memory On shared memory

  9. Johnson- Cook Material Modeling Hierarchy

  10. Multi-pressure model for multi-material problems • Typical two-phase flow codes are implemented with single pressure models for multi-phase or multi-material flows. • Suitable for disperse two-phase flows. • Multi-pressure model is implemented in CartaBlanca, and has Significant advantages for • Fluid-structure interaction. • Projectile-target interactions The pressure difference tears clothes

  11. h h h Spalling of brittle porous solid Time to damage Elastic Theory: 1.18 s. Our simulation: 1.12 s. Error: 5%. Stress Elastic Theory: 0.69 GPa Our simulation: 0.76 GPa Error 11%.

  12. Johnson-Cook model for projectile target interactions • Elastic Prediction • Update yield surface • If effective stress exceeds yield surface return the stress to the yield surface. • Calculated plastic work • Increase temperature.

  13. Johnson-Cook model for projectile target interactions

  14. Parameters in Johnson-Cook model • We assume adiabatic heating for the rapid rate of strain. Each calculation takes < 1.5 hours on this laptop.

  15. Graphic User Interface (GUI)

  16. Graphic User Interface (GUI)

  17. User Manual

  18. Theory Manual

  19. Programmer Manual • For programmers to add new capabilities. • To be done.

  20. Next Steps

  21. Next Steps

  22. Next Steps • Complete and Find suitable EPIC calculation for comparison. Perform calc./comp. • Incorporate proprietary concrete model. • Assist with concrete model/brittle damage calculations. • Complete manuals of the code. • Tutorial/workshop of CartaBlanca.

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