Quiet direct simulation of plasmas

A la mos NATIONAL LABORATORY Quiet direct simulation of plasmas

A new approach to particle simulation, called “quiet direct simulation Monte Carlo” (QDSMC) , is described that can be applied to many problems of interest, including hydrodynamics, MHD simulation and the,modeling of plasmas with arbitrary and arbitrarily varying collisionality. The essence of QDSMC ’ is the use of carefully chosen weights for the particles (e.g., Gauss-Hermite, for Maxwellian ...

Direct simulation Monte Carlo schemes for Coulomb interactions in plasmas

We consider the development of Monte Carlo schemes for molecules with Coulomb interactions. We generalize the classic algorithms of Bird and Nanbu-Babovsky for rarefied gas dynamics to the Coulomb case thanks to the approximation introduced by Bobylev and Nanbu [1]. Thus, instead of considering the original Boltzmann collision operator, the schemes are constructed through the use of an approxim...

Rapid optimization of blast wave mitigation strategies using Quiet Direct Simulation and Genetic Algorithm

A true-direction reconstruction of the quiet direct simulation method for inviscid gas flows

In this paper, a true-direction flux reconstruction of the second-order quiet direct simulation (QDS2N) Smith et al. (2009) [3] as an equivalent Euler equation solver, called QDS-N2, is proposed. Because of the true-directional nature of QDS, where volume-to-volume (true-direction) fluxes are computed, as opposed to fluxes at cell interfaces as employed by traditional finite volume schemes, a v...

Integrated Simulation of Fusion Plasmas

netically confined plasmas with an eye toward producing fusion energy. But understanding the behavior of such plasmas has proved to be a scientific challenge of the highest order. (For a review of the basics, see boxes 1 and 2.) A perhaps provocative comparison with biological organisms or Earth’s climate system might shed light on why. All three systems are delicate and heterogeneous, maintain...