We consider a two-level method for discretization and solution of the equilibrium Navier-Stokes equations. The method yields an L 2 and H 1 optimal velocity approximation and an L 2 optimal pressure approximation. The 2-level method involves solving one small, nonlinear coarse mesh system, one Oseen problem (hence linear with positive deenite symmetric part) on the ne mesh and one linear correc...

Multicast communication services, in which the same message is delivered from a source node to an arbitrary number of destination nodes, are being provided in new generation multicomputers. Broadcast is a special case of multicast in which a message is delivered to all nodes in the network. The nCUBE-2, a wormhole-routed hyper-cube multicomputer, provides hardware support for broadcast and a re...

It is now well-known that a curvilinear discretization of the geometry is most often required to benefit from the computational efficiency of high-order numerical schemes in simulations. In this article, we explain how appropriate curvilinear meshes can be generated. We pay particular attention to the problem of invalid (tangled) mesh parts created by curving the domain boundaries. An efficient...

This paper presents a low power VLSI architecture for video object motion-tracking that can be used in v e v low bit rate online video applications. Power has been reduced at both algorithmic and arithmetic levels. The video object motion-tracking architecture consists of two main parts, a mesh-based motion estimation unit and a mesh-based motion compensation unit. The mesh-based motion estimat...

The stability and accuracy of three methods which enforce either a divergence-free velocity field, density invariance, or their combination are tested here through the standard Taylor?Green and spin-down vortex problems. While various approaches to incompressible SPH (ISPH) have been proposed in the past decade, the present paper is restricted to the projection method for the pressure and veloc...

A numerical model for local scour with free surface and automatic mesh deformation is constructed and numerical simulation is carried out to compare with experimental results. The k2 model is used to simulate the turbulent flow field. Two interfaces (water and air, water and sediment) in the domain are captured with different approaches. The free surface of the flow is captured by Volume of Flu...

OBJECTIVES To review intraoperative and postoperative complications associated to the correction of cystocele and rectocele with polypropylene mesh macropore monofilament (Gynemesh PS) using transvaginal free tension technique. MATERIALS AND METHODS Prospective study of patients that have been submitted to correction of cystocele and/or rectocele between November 2004 and August 2005 in the U...