This paper explores methods for synthesizing physics-based bubble sounds directly from
two-phase incompressible simulations of bubbly water flows. By tracking fluid-air
interface geometry, we identify bubble geometry and topological changes due to
splitting, merging and popping. A novel capacitance-based method is proposed that can
estimate volume-mode bubble frequency changes due to bubble size, shape, and proximity
to solid and air interfaces. Our acoustic transfer model is able to capture cavity
resonance effects due to near-field geometry, and we also propose a fast precomputed
bubble-plane model for cheap transfer evaluation. In addition, we consider a
bubble forcing model that better accounts for bubble entrainment, splitting, and merging events, as well as a
Helmholtz resonator model for bubble popping sounds. To overcome frequency bandwidth
limitations associated with coarse resolution fluid grids, we simulate micro-bubbles in
the audio domain using a power-law model of bubble populations. Finally, we present
several detailed examples of audiovisual water simulations and physical
experiments to validate our frequency model.