Cavitation Cloud Field: Standing-Wave Bubble Collapse (2D)

Real ultrasonic reactors don't drive a single isolated bubble — they fill a liquid-filled gap with a standing acoustic wave and nucleate a whole polydisperse cloud of microbubbles that respond very differently depending on where they sit in that wave. This 2D companion to the single-bubble Rayleigh–Plesset simulator models exactly that: roughly forty bubbles, each with its own ambient radius, independently integrate their own Rayleigh–Plesset equation while being driven by a local pressure amplitude set by a real standing-wave profile between a transducer and a reflector 5 cm apart. The result is a spatial map of cavitation violence — quiet bubbles near pressure nodes, violent adiabatic hot-spot collapses at antinodes — and raising the drive frequency visibly packs more antinode bands into the same physical gap, exactly as it does in a real sonochemical reactor. Tune the acoustic pressure amplitude, drive frequency, mean bubble radius and gas polytropic index to see how the cloud's collapse pattern, hot-spot temperatures and radical output respond.