The aerodynamics of high-speed vehicles in evacuated tunnels is studied with particular reference to the consequences choked flow conditions at tails vehicles. It shown that this has a dominant influence on overall (pressure, temperature, velocity). Together need for tunnel system be closed, high speeds cause aerodynamic behaviour differ greatly from conventional railway tunnels. A key purpose ...

Recent advances in computer technology and numerical algorithms have made it possible to model strongly kinetic parts of the Earth’s outer magnetosphere with hybrid and particle-in-cell codes. The critical issue in global magnetospheric simulations is efficient handing of disparate temporal scales which naturally arise in various regions of a large computational domain. Modern quasi-neutral hyb...

A low diffusion E-CUSP (LDE) scheme for preconditioned Navier-Stokes equations is developed. With unfactored implicit Gauss-Seidel relaxation scheme for time integration, the LDE scheme with high-order WENO reconstruction is used to simulate several flows at various speed from low speed natural convection to supersonic flows. Numerical results are presented to show efficiency, accuracy and robu...

Because of the development of recent broadband access technologies, fair service among users is becoming more important goal. The most promising router mechanisms for providing fair service is per–flow traffic management. However, it is difficult to implement in high–speed core routers because per– flow state management is prohibitively expensive; thus, a large number of flows are aggregated in...