Abstract
The interaction of an external point acoustic source in a lossy immersion medium with an absorbing fluid sphere is modeled. The analytic boundary-element-method and finite-element-method solutions for the internal pressure and displacement fields are evaluated numerically for a 50-mm-diameter fluid sphere in an immersion medium of mass density of 1000 kg/m3 and sound speed of 1500 m/s. The mass density and sound speed of the fluid sphere are treated as parameters varying from 0.5 to 2 times the value of the corresponding medium property. Absorption is neglected in the immersion medium but is assumed to be 0 or 10 dB per wavelength in the fluid sphere. Each of two frequencies is considered, 10 and 100 kHz, for which the approximate wavenumber-radius products are 1 and 10, respectively. Results for the three solution methods are compared. [Work partly supported by NOPP through ONR Award No. N000140710992.]
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