HR: 0800h
AN: AE31A-0156    [Abstracts]
TI: Parallelization of the PLUME and UNIMAX Computer Codes
AU: Roussel-Dupre, R
EM: rroussel-dupre@lanl.gov
AF: Los Alamos National Laboratory, Earth & Environmental Sciences, EES-2, MS-F665, Los Alamos, NM 87545 United States
AU: * Travis, B J
EM: bjtravis@lanl.gov
AF: Los Alamos National Laboratory, Earth & Environmental Sciences, EES-2, MS-F665, Los Alamos, NM 87545 United States
AU: Colman, J J
EM: jonah@lanl.gov
AF: Los Alamos National Laboratory, Earth & Environmental Sciences, EES-2, MS-D401, Los Alamos, NM 87545 United States
AU: Symbalisty, E M
EM: esymbalisty@lanl.gov
AF: Los Alamos National Laboratory, International, Space & Response, ISR-RD, MS-B220, Los Alamos, NM 87545 United States
AB: PLUME computes the evolution of an electron distribution function through the relativistic Fokker-Planck equation and continuity equations. Features include transport, drag, scattering, production of secondary electrons by primary ionization, recombination reactions, and an applied external electric field. Geophysical applications include sprites. The UNIMAX code is used for lightning modeling; it computes breakdown and avalanche processes for cosmic-ray initiated electron showers in an electric field. Explicit finite difference numerical algorithms are used for both codes. Options for numerical treatment of fluxes range from simple donor differencing to higher order Godunov. The PLUME code employs two space dimensions plus time plus two phase space dimensions; consequently, computer simulations are very computationally intensive. In addition, for UNIMAX to accurately follow the development of lightning, extremely fine gridding is required. To extend the range of applicability of these codes, we are parallelizing them. Parallelization is achieved through the MPI library. Performance of the parallelized codes vs. problem size and number of CPUs is discussed.
DE: 3324 Lightning
DE: 3337 Numerical modeling and data assimilation
DE: 3220 Nonlinear dynamics
DE: 3304 Atmospheric electricity
SC: Atmospheric and Space Electricity [AE]
MN: 2004 AGU Fall Meeting