T-I-1

Analytical functions: conformal map and applications to hydrodynamics

This homework deals with the application of conformal maps to the study of two-dimensional hydrodynamics. A conformal map is a geometrical transformation which preserves all (oriented) crossing angles between lines. In dimension $d\ge 3$ a conformal map is necessarily composed from the following limited number of transformations: translations, rotations, homothetic transformation and special conformal transformation (which is the composition of a reflection and an inversion in a sphere). However in two dimensions, $d=2$, the space of conformal mappings is much larger and one can show that, given an open set $\mathrm{\Omega }\in \mathbb{ℂ}$, any holomorphic function $f:\mathrm{\Omega }\to \mathbb{ℂ}$ such that $f^{\prime }(z)\ne 0$, Failed to parse (unknown function "\math"): {\displaystyle \forall \in \Omega <\math> defines a conformal map from <math>\Omega} to $f(\mathrm{\Omega })$.