A plane graph is called a rectangular if each of its edges can be oriented either horizontally or vertically, interior regions four-sided region and all fitted in enclosure. If the dual graph, then rectangularly dualizable graph. it area-universal any assignment areas to realized by combinatorially weak equivalent dual. It still unknown that there exists no polynomial time algorithm construct a...

A transonic air stream flowing over a rectangular cavity or enclosure is unsteady. At certain flow conditions, large scale oscillations develop in the shear layer which, for an open cavity, spans across the whole enclosure. The convected shear layer instabilities interact with the cavity geometry, they generate resonance, and induce large amplitude wall pressure fluctuations, aerodynamic pressu...

This work presents a study by numerical simulation of mixed convection in rectangular cavity with sinusoidal temperature imposed on the right vertical wall while other left is kept at cold temperature. The upper and lower walls are thermally insulated, inlet outlet ports respectively located hot to bottom top left. enclosure represents practical system such as an air-cooled electronic device, h...

The sound properties along a long rectangular enclosure with a circular source on the top wall and rectangular opening at the side wall are studied. A mathematical model of average pressure at an opening contributed by the sound source and assuming air piston at the opening is derived in terms of the acoustic mode for a rigid duct. Three-dimensional numerical modelling is conducted to compare t...