BOUT
Application of parallel implicit methods to edge-plasma numerical simulations. A description is given of the parallelization algorithms and results for two codes used extensively to model edge plasmas in magnetic fusion energy devices. The codes are UEDGE, which calculates two-dimensional plasma and neutral gas profiles over long equilibrium time scales, and BOUT, which calculates three-dimensional plasma turbulence using experimental or UEDGE profiles. Both codes describe the plasma behavior using fluid equations. A domain decomposition model is used for parallelization by dividing the global spatial simulation region into a set of domains. This approach allows the use of a recently developed Newton-Krylov numerical solver, PVODE. Results show nearly an order of magnitude speedup in execution time for the plasma transport equations with UEDGE when the time-dependent system is integrated to steady state. A limitation that is identified for UEDGE is the inclusion of the (unmagnetized) fluid gas equations on a highly anisotropic mesh. The speedup of BOUT scales nearly linearly up to 64 processors and gets an additional speedup factor of 3--6 by using the fully implicit Newton-Krylov solver compared to an Adams predictor corrector. The turbulent transport coefficients obtained from BOUT guide the use of anomalous transport models within UEDGE, with the eventual goal of a self-consistent coupling.
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References in zbMATH (referenced in 7 articles , 1 standard article )
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Sorted by year (- Stals, L.; Numata, R.; Ball, R.: Stability analysis of time stepping for prolonged plasma fluid simulations (2008)
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- Hindmarsh, Alan C.; Brown, Peter N.; Grant, Keith E.; Lee, Steven L.; Serban, Radu; Shumaker, Dan E.; Woodward, Carol S.: SUNDIALS: suite of nonlinear and differential/algebraic equation solvers. (2005)
- Knoll, D. A.; Keyes, D. E.: Jacobian-free Newton-Krylov methods: a survey of approaches and applications. (2004)
- Rognlien, T. D.; Xu, X. Q.; Hindmarsh, A. C.: Application of parallel implicit methods to edge-plasma numerical simulations. (2002)