Acoustic Nonreciprocity in Coriolis Mean Flow Systems

Abstract

One way to break acoustic reciprocity is to have a moving wave propagation medium. If the acoustic wave vector and the moving fluid velocity are collinear we can use the wave vector shift caused by the fluid flow to break reciprocity. In this paper we investigated an alternative approach in which the fluid velocity enters the differential equation of the system as a cross product term with the wave vector. A circular field where the fluid velocity increases radially has a Coriolis acceleration term. In such a system, the acoustic wave enters from the central wall and exits from the perimeter wall. In this paper, we solved the differential equation numerically and investigated the effect of fluid velocity on the nonreciprocity factor.