  The development and validation of 3D multiphase computational fluid dynamics
(M-CFD) models and physics-informed data-driven modeling require data of
high-quality and high-resolution. Considering the difficulties in acquiring the
corresponding experimental data in prototypical conditions, two-phase boiling
simulations by Interface Tracking Method (ITM) based models can be used to
generate high-resolution numerical data in a consistent and relatively
economical manner. A boiling model is developed in one of the ITM-based
multiphase-flow solvers, named PHASTA, to investigate the nucleate boiling
phenomenon. The interaction between bubbles forming at adjacent nucleation
sites is investigated with this ITM boiling model. Nucleate pool boiling
simulations with multiple nucleation sites are presented in this paper and
influences of site distance, neighboring bubble size and contact angle effect
are investigated. The presented boiling model can conduct boiling simulation on
3D unstructured computational meshes. These simulation results improve our
understanding of the physical mechanisms of the nucleate boiling phenomenon and
provide high-resolution numerical data for M-CFD validation and advanced
boiling model development.
