C. Vanhille et A. Lavie, AN EFFICIENT TOOL FOR MULTIFREQUENCY ANALYSIS IN ACOUSTIC SCATTERING OR RADIATION BY BOUNDARY-ELEMENT METHOD, Acustica, 84(5), 1998, pp. 884-893
In this article, a new boundary element algorithm in acoustic scatteri
ng or radiation is proposed. Based upon a linear frequency interpolati
on, this original method allows a real practical, fast and easy use of
the boundary element method for a multi-frequency analysis. This tech
nique is original for two reasons. The first one is the automation of
its utilization using the interpolation between the two bounding frequ
encies 0 Hz and the top-frequency of the spectrum given by the ''lambd
a/4 criterion'' associated with the quadratic isoparametric discretiza
tion for any geometry. Furthermore; in the case of its application to
axisymmetrical problems, the circular surface elements of the mesh are
automatically split through decomposition points. This allows a savin
g of central processor unit time. Moreover, this profit increases very
quickly with the size of the mesh and the number of calculation frequ
encies. These motives make this boundary element linear interpolation
method very attractive.