Grid system

Grid system
The vehicle body shape is broken into grid squares, or cells, see Figure 1.29. Depending on the shape of the panel, the grid cells may be of different shapes between square and oblong.
The squares are then considered as imaginary cube shapes, see Figure 1.30. A set of calculations called the Navier–Stokes equations gives a rela- tionship between pressure, momentum and viscous forces in threedimensional space. There is also a similar set called the Euler equations. The above calculations covered some of these concepts. The computer is used to calculate the amount of energy which is entering each cube and in turn leaving it. Obviously the two figures should balance and there will be flow between adjacent cubes.