CALCULATION OF THE ACOUSTIC CHARACTERISTICS OF THE FLOW OF A COMPRESSIBLE VISCOUS GAS OVER A CIRCULAR CYLINDER

The generation of noise by the fl ow of a compressible viscous gas over a circular cylinder as a result of the formation of vortices in it and the separation of them from the surface of the cylinder was considered. The sound fi eld of this fl ow was calculated using the method of simulation of large vortices, and its acoustic characteristics were determined using the method of acoustic analogy based on the solution of the Ffowcs Williams–Hawkings equation. On the basis of the direct numerical simulation data on the indicated fl ow, its regimes at diff erent Reynolds numbers were investigated. The results of calculation of the acoustic characteristics of this fl ow within the framework of the two- and three-dimensional approaches to the solution of the Ffowcs Williams–Hawkings equation were compared. A good agreement has been obtained between the calculated gasdynamic and acoustic characteristics of a gas fl ow over a circular cylinder and the corresponding experimental and calculation data available in the literature.
   
Author:  K. N. Volkov, V. N. Emel′yanov, A. G. Karpenko, P. S. Chernyshov
Keywords:  aeroacoustics, computational gas dynamics, cylinder, noise, fl ow separation, vortex, directional diagram
Page:  1239