In 2007, the results from a comparison study of grid based codes and SPH codes on multiphase interactions in compressible fluids were presented [1]. The main conclusion from this study was that whilst the grid codes are able to describe important dynamical instabilities, such as KelvinHelmholtz (KH) and Richtmyer-Meshkov (RM), these processes are poorly described by existing SPH codes. It was l...

Oral administration of dosage form is the priority for the patients as per its easy administration, economical formulation and various other reasons. Drugs having good absorption in proximal gastrointestinal tract (GIT) part possess bioavailability problem due to less gastric residence time of drug in the stomach. Thus superporous hydrogel (SPH) is a supreme approach to deliver the drug in uppe...

Smoothed Particle Hydrodynamics (SPH) is a particle method to simulate compressible uids. First we present a brief introduction to SPH, where we focus on an approach to treat the physical viscosity. Then we describe in detail the basic principles of our parallel implementation of the SPH method. The eeciency of the code on Cray T3E and IBM SP2 is discussed. In the last part we present a short i...

A drawback of the Smoothed Particle Hydrodynamics (SPH) method is its computational effort. An intuitive way to reduce the calculation time, is to use SPH only in parts of the problem domain where it is necessary, e.g. in a region where interfaces are present, because of the advantages of SPH for multiphase flow. In other parts of the problem domain, e.g. in a region of simple flow, a cheap met...

In this paper, an SPH method based on the SPH–ALE formulation is used for modelling two-phase flows with large density ratios and realistic sound speeds. The SPH scheme is further improved to circumvent the tensile instability that may occur in the SPH simulations. The two-phase SPH solver is then used to model a benchmark problem of liquid impact on a rigid wall. The results are compared with ...

The development of a methodology for the simulation of structure forming processes is highly desirable. The smoothed particle hydrodynamics (SPH) approach provides a respective framework for modeling the self-structuring of complex geometries. In this paper, we describe a diffusion-controlled phase separation process based on the Cahn-Hilliard approach using the SPH method. As a novelty for SPH...

We derive a new special-relativistic version of Smooth Particle Hydrodynamics (SPH) from the Lagrangian of an ideal fluid. The new formulation accounts for the terms that stem from non-constant smoothing lengths, in SPH usually called ”grad-h terms”. To handle shocks a refined artificial viscosity scheme is applied. The performance of this new equation set is explored in a variety of benchmark ...

This paper presents a new technique for modification of 3D terrains by hydraulic erosion. It efficiently couples fluid simulation using a Lagrangian approach, namely the Smoothed Particle Hydrodynamics (SPH) method, and a physically-based erosion model adopted from an Eulerian approach. The eroded sediment is associated with the SPH particles and is advected both implicitly, due to the particle...