SCHEDULE: NOV 10-16, 2007

Parallel scalable algorithm for 3D nonlinear simulations of plasma instabilities in thermonuclear fusion devices

Session: Posters Reception

Event Type: Poster

Time: 5:15pm - 7:00pm

Session Chair: Tamara K Grimmett

Author(s): Nina Popova

Location: Ballroom Lobby

Abstract:
Parallel scalable algorithm for solution of 3D nonlinear magnetohydrodynamic equations is suggested. Parallel program is developed on the base of 3D nonlinear code NFTC used in simulation of plasma instabilities in thermonuclear fusion. Numerical method of NFTC code is based on semi-spectral representation of solution. Fourier expansion in toroidal and poloidal angles of toroidal coordinate system and quasi-radial direction finite difference scheme are used. Fully implicit scheme in time needs to invert block tridiagonal matrix in each step. The most time consuming part of the code is calculation of convolutions sums of Fourier coefficients. Parallel algorithm using different truncation of convolution sums is proposed. Special adaptive algorithm permitting optimal distribution of memory space during calculations is suggested. Effectiveness and scalability of the new parNFTC code for IBM pSeries 690 Regatta system are demonstrated. New advantages of parallel code for solving optimization plasma parameters problem for reactor devices are shown.

Chair/Author Details:

Tamara K Grimmett (Chair)
INL

Nina Popova
Moscow State University

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