Abstract In view of the lack comprehensive consideration pressing process in existing Polymer Bonded Explosive (PBX) powder compressibility evaluation method, re-analysis is firstly carried out, and loading unloading section should be simultaneously considered during PBX modeling evaluation. Based on this idea, a specific energy method for rapidly evaluating proposed through description. This c...

In this article we consider the numerical modeling and simulation via phase field approach for coupled two-phase free flow porous media of different densities viscosities. The model consists Cahn-Hilliard-Navier-Stokes equations in region Cahn-Hilliard-Darcy that are by several domain interface conditions. It is showed satisfies an energy law. Then first propose a unconditionally stable finite ...

A composite-grid numerical method is developed for simulating unsteady, three-dimensional (3D), incompressible flows in complex geometries. The governing equations are solved using a second-order accurate, finite-volume method based on the dual time-stepping artificial compressibility approach. Overset grids are employed to discretize arbitrarily complex geometries, and a new interface algorith...

OBJECTIVES The aim of this study was to improve flowability and compressibility characteristics of starch to use as a suitable excipient in direct compression tabletting. Quasi-emulsion solvent diffusion was used as a crystal modification method. MATERIALS AND METHODS Corn starch was dissolved in hydrochloric acid at 80°C and then ethanol as a non-solvent was added with lowering temperature u...

In this paper, forced and free convection in the cavity is simulated numerically with complex boundary conditions. Temperature changes sinusoidally at the upper and right walls and the temperature of the other walls is kept at zero. The effects of Prandtl and Grashof numbers variations on flow patterns are surveyed. A wide range of materials, e.g. molten metals, gases, water, and coolant liquid...

This article introduces a second-order direction splitting method for solving the incompressible Navier–Stokes–Boussinesq system in spherical shell region. The equations are solved on overset Yin–Yang grids, combined with coordinate transforms. approach allows to avoid singularities at poles and keeps grid size relatively uniform. downside is that subdivided into two equally sized, overlapping ...