Passive radiation shielding alone is insufficient for protecting astronauts from galactic cosmic ray exposure. Active shields, utilizing electromagnetic fields to deflect heavy charged ions in space, could be used supplement conventional passive shielding. Due experimental limitations, simulation capability crucial designing effective active shields. The purpose of this work validate the Shield...

In this paper we use the 10-moment description of fluid flow to compute internal nozzle flow and external flow around a micro-airfoil in the continuum-transition regime. The numerical method used is Hancock’s scheme, a second-order non-oscillatory Godunov-type scheme; the numerical flux function incorporated is of the Harten-Lax-van Leer (HLL) type and due to Linde (HLLL). The numerical solutio...

We describe OSIRIS, a three-dimensional, relativistic, massively parallel, object oriented particle-in-cell code for modeling plasma based accelerators. Developed in Fortran 90, the code runs on multiple platforms (Cray T3E, IBM SP, Mac clusters) and can be easily ported to new ones. Details on the code’s capabilities are given. We discuss the object-oriented design of the code, the encapsulati...

We have developed a method for measuring the electrophoretic mobility of submicrometer, fluorescently labeled particles and the electroosmotic mobility of a microchannel. We derive explicit expressions for the unknown electrophoretic and the electroosmotic mobilities as a function of particle displacements resulting from alternating current (AC) and direct current (DC) applied electric fields. ...

Accounting for the Reynolds number is critical in numerical simulations of turbulence, particularly for subsonic flow. For Smoothed Particle Hydrodynamics (SPH) with constant artificial viscosity coefficient α, it is shown that the effective Reynolds number in the absence of explicit physical viscosity terms scales linearly with the Mach number — compared to mesh schemes, where the effective Re...

cement powder size classification efficiency significantly affects quality of final product and extent of energy consumption in clinker grinding circuits. static and dynamic or high efficiency air separators are being used widely in closed circuit with multi-compartment tube ball mills, high pressure grinding rolls (hpgr) and more recently vertical roller mills (vrm) units in cement plants to c...