Spectral solver for multi-scale plasma physics simulations with dynamically adaptive number of moments

Vencels, JurisKTH,High Performance Computing and Visualization (HPCViz) (författare)

QC 20151202
A spectral method for kinetic plasma simulations based on the expansion of the velocity distribution function in a variable number of Hermite polynomials is presented. The method is based on a set of non-linear equations that is solved to determine the coefficients of the Hermite expansion satisfying the Vlasov and Poisson equations. In this paper, we first show that this technique combines the fluid and kinetic approaches into one framework. Second, we present an adaptive strategy to increase and decrease the number of Hermite functions dynamically during the simulation. The technique is applied to the Landau damping and two-stream instability test problems. Performance results show 21% and 47% saving of total simulation time in the Landau and two-stream instability test cases, respectively.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
Fluid-kinetic coupling
Plasma simulations
Spectral methods
Distribution functions
Kinetics
Plasma simulation
Spectroscopy
Vlasov equation
Adaptive strategy
Hermite expansion
Hermite functions
Hermite polynomials
Kinetic approach
Kinetic coupling
Two stream instability
Polynomials

Delzanno, G. L. (författare)
Johnson, A. (författare)
Peng, I. BoKTH,High Performance Computing and Visualization (HPCViz)(Swepub:kth)u1hwtn2r (författare)
Laure, ErwinKTH,High Performance Computing and Visualization (HPCViz)(Swepub:kth)u1n9d88r (författare)
Markidis, StefanoKTH,High Performance Computing and Visualization (HPCViz)(Swepub:kth)u1y5heyt (författare)
KTHHigh Performance Computing and Visualization (HPCViz) (creator_code:org_t)

Av författaren/redakt...: Vencels, Juris; Delzanno, G. L.; Johnson, A.; Peng, I. Bo; Laure, Erwin; Markidis, Stefan ...

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