Rectangular duct @150Hz

Simulation of the propagation of an acoustic plane wave (@150Hz) through a rectangular duct (110mmx190mmx1000mm). At low frequency, only the plane mode propagates.
This simulation has been done with Time Domain BEM solver SONATE© in LMS Virtual.Lab® (http://imacs.polytechnique.fr/SONATE.htm). It has been used as an illustration of the master course on wave propagation of Dr. Isabelle Terrasse @ Ecole Polytechnique http://www.catalogue.polytechnique.fr/cours.php?id=2586&langue=FR.