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I am a postdoctoral researcher in the Applied Numerical Algorithms Group at Lawrence Berkeley National Laboratory. I am currently working with members of the LOASIS Laboratory in the Accelerator Physics Division to study stabilization processes in plasma discharges within capillaries.

I develop and maintain Scylla and Charybdis, which are codes for modeling compressible gas-dynamic and plasma flows in various geometries.

Projects

  • Scylla (flows in 1D cylindrical geometries)
  • Charybdis (flows in 2D/3D engineering geometries)
  • Low-temperature capillary discharges
  • Transport processes in gases, gas mixtures, and plasmas
  • Chombo development

Research Interests

  • Gas dynamics and shock physics
  • Plasmas and magnetohydrodynamics
  • Fluid-structure interaction
  • Numeric methods for realistic and dynamic geometries
  • Software engineering

Publications

J. Johnson, D. Q. Hwang, R. D. Horton, R. W. Evans, J. M. Owen, “Simulated and experimental compression of a compact toroid”, Applied Physics Letters 95, 11501 (2009)

J. Johnson, "Simulating Magnetized Laboratory Plasmas with Smoothed Particle Hydrodynamics", PhD thesis, UC Davis Department of Applied Science and Lawrence Livermore National Laboratory (2009)

J. Johnson, J. M. Owen, “A Meshless Local Petrov-Galerkin Method for Magnetic Diffusion”, Computer Modeling in Engineering and Science 22, 165 (2007)

Stephen J. Howard, D. Q. Hwang, R. D. Horton, R. W. Evans, S. J. Brockington, J. Johnson, "Method of reconstructing a moving pulse", Journal of Instrumentation 2, 1108 (2007)

J. Johnson, P. F. Dubois, "Issue Tracking", Computing in Science and Engineering 5, 71 (2003)

Contact

Please contact me (jnjohnson at lbl dot gov) if you are interested in any of the above.

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