Inside nuclear reactors, boiling water, bubbles, and turbulent flows affect safety and efficiency. For many years, modeling turbulent bubbly flows was a challenging, time-consuming problem. Researchers were largely limited to experiments that yielded only a few bubbles at a time. Now, they can simulate the thousands of bubbles needed to model and predict the behavior of the flows in nuclear reactors. A team from North Carolina State University developed a novel bubble-tracking method. The supercomputer-based method produces a level of detail that cannot be observed directly in experiments.