Contribution
A Semi-Analytical Finte Element Method for Outdoor Sound Propagation
* Presenting author
Abstract:
Winds and temperature inversions can lead to acoustic refraction, allowing low-frequency sound to propagate efficiently over long distances within acoustic waveguides. This study utilizes the semi-analytic finite element (SAFE) method to predict such effects in stratified, inhomogeneous, moving air for range-independent noise propagation over reflective half-planes. A solution is presented for a point source radiating in an atmosphere under realistic wind conditions. Results are compared with direct numerical solutions of the two-dimensional linearized Euler equations (LEE). We also present a method to interface the LEE and the SAFE method, hence preparing its utlization as an efficient hybrid method. For extensive, range-independent domains, the proposed method proves significantly more efficient than the tested direct numerical approaches, providing a viable approach for benchmarking other pressure field prediction methods.