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The mutual interaction between small oscillating cavitation bubbles (R₀1bar, f=20kHz) is investigated numerically. We assume spherical symmetry and a coupling of the bubble oscillations. Our results show that the strength and even the directions of the resulting secondary Bjerknes forces differ considerably from predictions of the well-known linear theory. This is of immediate consequence for understanding and modeling structure formation processes in acoustic cavitation and multibubble sonoluminescence.
Mettin et al. (Mon,) studied this question.