Topology of Skin-Friction and Velocity Fields

The topological analysis of velocity and skin-friction fields potentially is a useful tool for flow-field interpretations and also for problem diagnosis. In practice, however, normally not much use is made of topological analysis, maybe because it is often treated in a rather formalistic way. In view of the topic of this book we intend to accentuate the practical rather than the theoretical side of the field of topology. Even this will be made only in a rather sketchy way.