In the present world, passive control finds application in various areas like flow over blunt projectiles, missiles, supersonic parallel diffusers (for cruise correction), engine of jets, static testbeds rockets, ports internal combustion engines, vernier and single expansion ramp nozzle (SERN) rockets. this review, techniques to base pressure regulate drag force are discussed. study, papers ra...

In the pursuit of efficiency there is continued and developing interest in the subject of winglets and novel designs such as Blended Wing Body and Oblique Flying Wing. Winglets may exist in many modes, ranging from endplates, through folded wing tips to complex upper and lower surface partial chord devices. We have developed a design process that is directly applicable to the design of wings an...

In order to study the possibility of aerodynamic optimization base cavity for slender body, influence with non-cylindrical shape, which is different from traditional column one, investegated by numerical method in paper. The supersonic flow field same body two sorts unconventional cavity, half truncated-cone and column, simulated axisymmetric Navier-Stokes equations. Distribution Mach Number (M...

One challenge associated with the simulation of buried detonations involves the treatment of the multiphase flow phenomena related to the soil. At the moment when the soil “shatters” into a dense particulate cloud with detonation products escaping through the soil particles, the continuum model that assumes a single velocity shared by the blast gas and the soil at any given point no longer hold...

in the computational fluid dynamics (cfd) modeling of gas-solids two phase flow, the effect of boundary conditions play an important role in predicting the hydrodynamic characteristics of fluidized beds. in this work, the hydrodynamics of conical fluidized bed containing dried tio2 nano-agglomerates were studied both experimentally and computationally. the pressure drop was obtained by pressure...

We study the evolution (expansion or oscillation) of cylindrically symmetric magnetic flux ropes when the energy dissipation is due to a drag force proportional to the product of the plasma density and the radial speed of expansion. The problem is reduced to a single, second-order, ordinary differential equation for a damped, non-linear oscillator. Motivated by recent work on the interplanetary...

a series of subsonic wind tunnel tests was conducted on an ogive-cylinder-flare configuration at zero angle of attack to study the effects of small helical protuberances on viscous drag reduction behavior. the experiments have been carried out on a smooth model and two wire-wrapped models with different spacing between the helical riblet rings, known as pitch length. in the present experiments,...