264
8. Con~plex Geometries
Fig. 8.22. Pressure distribution on the cylinder surface and the surfaces of constant
pressure p = 1.1 (in front of the cylinder) and p = 0.3 (behind the cylinder) for the
flow over a cylinder in a square channel, calculated on a grid with 188 416 CVs at Re
= 100
surface 'colored' by the magnitude of the u, velocity component);
from Muzaferija et al. (1995)
vectors and streamlines, which are often used in 2D, are difficult to both draw
and interpret in 3D problems. Presentation of contours and vector projections
on selected surfaces (planes, iso-surfaces of some quantity, boundary surfaces
etc.) and the possibility to view them from different directions is perhaps
the best way of analyzing 3D flows. Unsteady flows require animation of the
results. We shall not deal further with these issues, but want to stress their
importance.