PCB structures like traces couple to the cavity field inside of an enclosure. It has been presented before that the coupling of a trace inside of a homogeneous cavity is caused just by its vertical segments on the trace ends. For an inhomogeneous cavity, consisting of a FR4 PCB layer and an air layer, we show that a trace couples along its whole length. The different coupling must be considered...

Natural convection in cubical enclosure with hot surface geometry and partial partitions has been analyzed. The geometry is a cube with wavy hot surface (three undulations) and three partitions. The investigation has been performed for different partitions lengths and Rayleigh number while the Prandtl number kept constant. This problem is solved by using the partial differential equations which...

The velocity-vorticity formulation is selected to yield a high quality solution for the natural convective ow in a diierentially heated cubical enclosure. A nite element solution procedure in conjunction with the biconjugate gradient stabilized (BiCGSTAB) sparse iterative solver is utilized to solve the fully coupled system of equations. A divergence free solution is guaranteed with equal order...

The present study is the 3-D simulation of cooling control electronic component, by natural convection and mixed in a cubical enclosure, filled with air. heating square portion similar to integrated device releasing constant flux placed on right vertical wall enclosure. same has, its upper part, an extractor, while rest considered adiabatic. Its opposite has opening maintained at cold temperatu...

We study numerically a recently introduced formulation of incompressible Newtonian fluid equations in vorticity – helical density and velocity – Bernoulli pressure variables. Unlike most numerical methods based on vorticity equations, the current approach provides discrete solutions with mass conservation, divergencefree vorticity, and accurate kinetic energy balance in a simple and natural way...

This article discusses computational techniques for simulating natural convection in three-dimensional domains using finite element methods with tetrahedral elements. These techniques form a new numerical procedure for this kind of problems. In this procedure, the treatment of advection by a wave equation approach is extended to three-dimensional unstructured meshes with tetrahedra. Numerical r...

In the present paper, effects of ventilation on isopropanol pool fire inside confined cubical enclosure are studied. Fire experiments performed in 64 m3 under different factors ranging from 2.404 to 0.00 m5/2, i.e., full door closed door. Several parameters were studied such as heat release rate, mass loss gas temperature, centerline flame exhaust concentration, doorway velocity profile, compar...

A high-resolution numerical study on parallel systems is reported on threedimensional, time-dependent, thermal convective flows. Numerical results are obtained for Rayleigh numbers up to 5 x 107 and for a Prandtl number 0.733 equivalent to that of air, in a cubical enclosure, which is heated differentially at two vertical side walls. A parallel implementation of the finite volume method with a ...