Abstract
In recent years, several authors have studied the impact of turbulence on sound propagation through numerical simulations. Currently, these simulations model the turbulence using a frozen turbulence hypothesis and a random Fourier modes (RFM) technique, such that the turbulent fluctuation at any point in the medium (either scalar or vectorial in nature) is calculated from the sum of a limited number of time-independent random Fourier modes. The RFM technique is quite easy to implement, and has been used to make accurate predictions of ensemble-averaged sound-pressure level for atmospheric propagation. In this paper, the extension of the RFM method to include simple time evolution of the fluctuations is presented. However, this method produces fields that do not satisfy the Navier–Stokes equations and thus cannot exhibit either the dynamics or the structures found in atmospheric boundary layer (ABL) turbulence. The desire to include ABL turbulence characteristics in simulations of atmospheric propagation has led to consideration of large eddy simulations (LES) for turbulence modeling. Here, numerical simulations obtained using both turbulence models in conjunction with a parabolic equation solver to calculate time-evolving acoustic fields, which are subsequently ensemble averaged to determine statistical characteristics, will be presented. [Work supported by CNRS/NSF and IDRIS under project 960742.]
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
