Large problems - BEM problems or problems for BEM?

Due to the pollution effect the FEM becomes inefficient for large wavenumbers k and for objects of large acoustical size kl. The paper presents an alternativ approach using the BEM. As the standard BEM is of order O(N ²) a Fast Multipole accellarated BEM is applyed. The reduced complexcity O(N log²(N)) of this method enables their efficient application to large scale problems. The method is sucessfully tested with the round robin test launched by the PTB in Braunschweig, Germany.