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The generation of microbubbles upon the collision and interaction of liquidbodies in a gaseous environment is a ubiquitous process in two-phase flows,including large-scale phenomena like ship wakes, breaking waves and rainshowers. These collision and interaction events involve the relative approachof pairs of liquid-gas interfaces. As these interfaces approach, the smallestlength scales of the system are dynamically reduced. This evolving disparity inlength scales is numerically challenging to resolve without the employment ofsubgrid-scale (SGS) impact and breakup models. In this study, a physics-basedimpact and breakup model for the generation of these microbubbles is developedand implemented. The objectives of this study are to develop a computationalalgorithm that identifies interface collision events that contribute to theformation of microbubbles, to formulate a physics-based breakup model thatpredicts the distribution of microbubble sizes using the characteristics of theoriginating gas film, and to integrate these modules into a two-phase flowsolver that accurately captures the effects of bubbles of all sizes. In theseproceedings, an SGS model suitable for the aforementioned problems is proposed,and the steps involved in implementing the proposed SGS model in a macroscaleflow solver are outlined. Two aspects of the development of this SGS model arethen discussed in detail. First, the formulation and implementation of thefirst step of the SGS model, the collision detection algorithm, is detailed.Second, preliminary findings of a numerical investigation intended to shedlight on breakup processes in turbulent two-phase flows are presented.

Subgrid-scale modeling for microbubble generation amid colliding water surfaces