DNS for Multiphase Flow Model Generation and Validation

Abstract

The modeling of averaged properties of multiphase flows has traditionally suffered from the lack of detailed and reliable data against which closure models can be validated. Direct Numerical Simulations (DNS) have now advanced to the point that they are able to provide such data for relatively complex systems such as hundreds of bubbles in turbulent flows. Here we discuss recent DNS results for bubbly flows in vertical channels and how these results are impacting our understanding of such flows. We also discuss briefly simulations of boiling flows and the challenges in conduction DNS of complex nucleate boiling.