Numerical simulations of bubble pulsations have been performed taking into account the effect of the bubble‐bubble interaction in order to analyze the experimentally observed bubble pulsation under an ultrasonic horn. In the theoretical analysis, two bubble clouds have been considered. The comparison between the experimental observation and the calculated results has indicated that the bubble expansion is strongly reduced by the bubble‐bubble interaction under an ultrasonic horn. It has also been shown that some bubbles move toward the horn tip due to the secondary Bjerknes force between the bubbles.

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