DNS for Multiphase Flow Model Generation and Validation
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
D9-1 CASL – Thermalhydraulics Activities in the Consortium for Advanced Simulation of LWRs

Gretar Tryggvason (University of Notre Dame)
Jiacai Lu (Worcester Polytechnic Institute)
Jacopo Buongiorno (Massachusetts Institute of Technology)


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.

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