The Evolution of the Problem of Resistance
The evolution of impact theory can be seen to progress in three phases. The first preliminary one consists of guesswork and poorly grounded solutions. The second phase establishes and formalizes the basic theory. The third throws doubts on its verisimilitude, which initiates a drive to introduce corrections to the basic theory. This process, whose general lines of thinking are common to many other fields of science, can be represented by an hourglass shape. The first phase, with a broad but ill-defined form due to the extent of ideas and concepts, narrows down to a select few mathematical formulas. It then opens out later into a range of applications and corrections due to real-life limitations of the theories. Following this scheme, we already have passed through the first two stages analysed in the previous chapters. We now come to the third stage: that of setting out the problems, along with solutions and corrections that were proposed which gave rise to a set of theories we have named ‘mixed’ and ‘hybrid’. The former interpret the effects in the front and rear parts of bodies using different assumptions; the latter calculate local effects using one theory which is superimposed on the determination of the fluid field obtained by another one.
KeywordsVortex Depression Assure Assimilation Resis
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