Oscillating bubbles appear in the bodily fluid
during many medical treatments, for example in Extracorporeal Shockwave Lithotripsy. We report a systematic
study on the complex interaction between two such bubbles
and an elastic membrane, which could be a biological
membrane in the human body. We have grouped our
analysis into similarly sized bubbles, and differently sized
bubbles. All bubbles are created at the same time. For the
similarly sized bubbles, it can be broadly characterized as
the splitting up of two bubbles in vertical direction perpendicular to (vertical split) and at an angle to (oblique
split) the membrane surface, jetting towards each other and
bubble coalescence. For the two differently sized bubbles,
there is the jetting towards or away from the large bubble
for the small bubble and the ‘catapult’ effect observed. The
two bubbles dynamics depend on the relative bubble sizes,
the distance from the membrane, and the inter-bubble
distance.