Acoustic fields and resonance responses from two spherical gas bubbles are investigated using a time-domain simulation. Interior acoustic fields are obtained simultaneously from the simulation of the entire acoustic field propagation with an immersed-boundary method. The linear resonance responses are obtained and discussed for each of the bubbles with respect to the respective interior gas velocities. Also, these are analyzed in the frequency domain in terms of the coupled interactions. Unlike previous numerical and analytical solutions, the method allows for two bubbles of different sizes and shapes to be in contact with each other, which is representative of applicable underwater scattering targets.
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