Methods of estimation of frequency spectrum and power of the sound generated by an unsteady flow through a sonic crystal
* Presenting author
Although the importance of sonic crystals serving as sound barriers is growing, only a little interest was given to the sound emission from the sonic crystal due to the windy weather conditions. A computational framework for a future extensive parametric study is proposed in the article. Three different methods are compared on a representative test case: a) the large eddy simulation, b) a hybrid calculation combining Reynolds averaged Navier-Stokes equations (RANS), Curle's analogy and the boundary element method and c) a hybrid calculation consisting of RANS simulation and subsequent calculation by means of Howe's analogy making use of a suitable Green's function. Comparison of the characteristic frequency, the overall spectrum shapes and radiation patterns is given.