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In-situ Visualization and Analysis of Plasma Surface Interaction Simulations Wathsala Widanagamaachchi SCI Institute, University of Utah Mentors : Li-Ta Lo, Chris Sewell & Jim Ahrens

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What are PSI simulations? Tungsten in future nuclear fusion reactors When exposed to helium & hydrogen plasmas, Surface defects and bubbles form Molecular dynamics (MD) simulations Data : LAMMPS simulation of Plasma Surface Interaction

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What is in-situ visualization & analysis? In-situ is a Latin phrase on site or in position Motivation Ever-increasing sizes of simulation data Post-processing is challenging disk I/O and the network bandwidths Data reduction method to the output data Apply visualization & analysis during runtime

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ParaView pipeline Reproduce existing ParaView pipeline Using Threshold Gaussian Splatter Isosurface Box Clip Glyph Tungsten Cavities Helium Bubbles

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LAMMPS + VTK Pipeline Collocate simulation with visualization & analysis LAMMPS as an external library within C++ At each time step, Simulation Visualization & analysis Lessons learnt : Working with LAMMPS & VTK

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LAMMPS + VTK Pipeline

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Serial & Parallel versions Serial : complete Parallel : technical issues with some VTK filters Gaussian Splatter Fast Splatter Lessons learnt : Creating a ParaView plugin Filters are not parallel

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Visualization Feedback from a domain scientist Definitions of Helium bubbles & Tungsten cavities all Helium atoms reachable through links shorter than the lattice unit (within the simulation) is considered to be in one bubble Realistic parameters to be used Helium atoms clustering in LAMMPS Evolution of bubbles & cavities Details to output (Data files & images) Running an entire simulation Larger dataset Karl Hammond, Department of Nuclear Engineering, University of Tennessee

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Visualization Feedback from an artist Better color maps Francesca Samsel, Los Alamos National Laboratory Lessons learnt : Importance of color in visualizations

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Visualization Camera movement, Timers Rendering issues depth ordering Correct image

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Analysis Helium clustering using LAMMPS Evolution of Helium bubbles Volume overlap of bubbles New color map to show evolution Displaying of statistics Percentage of atoms Helium bubbles, splits & merges

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Video

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Thank you.