1 citations · 2 across the 7 of their papers we have counts for
7 papers
Novel approach to general curvilinear coordinates for plasma fluid applications
Federico D. Halpern Tess N. Bernard, Oleksandr Koshkarov, Ronald E. Waltz
In general geometry, plasma fluid equations include nonlinear geometric sources associated with fictitious forces, which pose significant challenges to computer simulations. We ref…
Conservative projection-based data-driven model order reduction of a fluid-kinetic spectral solver
Opal Issan, Oleksandr Koshkarov, Federico D. Halpern +2
Kinetic simulations are computationally intensive due to six-dimensional phase space discretization. Many kinetic spectral solvers use the asymmetrically weighted Hermite expansion…
Effects of Artificial Collisions, Filtering, and Nonlocal Closure Approaches on Hermite-based Vlasov-Poisson Simulations
Opal Issan, Oleksandr Chapurin, Oleksandr Koshkarov +1
Kinetic simulations of collisionless plasmas are computationally challenging due to phase space mixing and filamentation, resulting in fine-scale velocity structures. This study co…
Conservative Closures of the Vlasov-Poisson Equations Based on Symmetrically Weighted Hermite Spectral Expansion
Opal Issan, Oleksandr Koshkarov, Federico D. Halpern +2
We derive conservative closures of the Vlasov-Poisson equations discretized in velocity via the symmetrically weighted Hermite spectral expansion. The short note analyzes the conse…
Scale Separation Effects on Simulations of Plasma Turbulence
Jago Edyvean, Tulasi N. Parashar, Tom Simpson +7
Understanding plasma turbulence requires a synthesis of experiments, observations, theory, and simulations. In the case of kinetic plasmas such as the solar wind, the lack of colli…
On a spectral method for -particle bound excitation collisions in kilonovae
Ryan T. Wollaeger, Chris L. Fryer, Robert Chiodi +9
The interaction of -particles with the weakly ionized plasma background is an important mechanism for powering the kilonova transient signal from neutron star mergers. For this…
Anti-symmetric and Positivity Preserving Formulation of a Spectral Method for Vlasov-Poisson Equations
Opal Issan, Oleksandr Koshkarov, Federico D. Halpern +2
We analyze the anti-symmetric properties of a spectral discretization for the one-dimensional Vlasov-Poisson equations. The discretization is based on a spectral expansion in veloc…