Numerical simulations on ion acoustic double layers

Ion acoustic waves and double-layers in electronegative expanding plasmas

Electron Transmission through Molecular Layers: Numerical Simulations and Theoretical Considerations

Electron transfer, a fundamental chemical process underlying all redox reactions, has been under experimental and theoretical study for many years.1 Theoretical studies of such processes seek to understand the ways in which their rate depends on donor and acceptor properties, on the solvent, and on the electronic coupling between the states involved. Such processes, which dominate electron tran...

Numerical Simulations of Transonic Flow Acoustic Resonance in Cavity

Direct numerical simulations are used to investigate transonic flow acoustic resonance in an open cavity. The numerical scheme minimizes the errors due to dispersion and dissipation of acoustic waves, and resolves both the unsteady flow and radiated acoustic field. Implicit solution of the compressible Navier-Stokes equations is obtained using a compact high-order spacial differencing scheme, c...

Ion acceleration through an auroral potential structure: Numerical simulations

We perform numerical simulations for the acceleration of O ions in a potential well which has an exponential form in x-direction with a characteristic length Lx. The oxygen ions are moving in the presence of constant magnetic field Bz and a constant electric field Ey. We trace the orbits of individual particles for different initial conditions (phase angle and kinetic energy). We found that dep...

Numerical Convergence of Gyrokinetic Simulations of Ion-temperature-gradient Turbulence

We examine the convergence of particle-based nonlinear \gyrokinetic simulations" of ion-temperature-gradient (ITG) turbulence [1] with respect to numerical parameters. Our main focus is on convergence with respect to particle number, both through direct particle number scans and through \scrambling tests" that determine the relative e ect of the noise due to particle discreteness. Results will ...