ASYMPTOTICAL METHODS FOR HELMHOLTZ OR NAVIER-STOKES TYPE EQUATIONS
ASYMPTOTICAL METHODS FOR HELMHOLTZ OR NAVIER-STOKES TYPE EQUATIONS
In this thesis, we study two diļ¬erential problems which depend on a small parameter e. We study the asymptotic of the solutions when e tends to 0. The ļ¬rst problem deals with the high-frequency Helmholtz equation. We construct a non-trapping potential which does not satisfy the refocusing condition introduced by ā¦