LES and PANS of turbulent flow through a staggered tube bundle

Two unsteady numerical techniques, Partially-AveragedNavier Stokes (PANS) and Large Eddy Simulation (LES), areused to predict the flow in a tube bundle. The results were compared with the existing experimental data. Both methods predicted the flow in a relatively good agreement with the experimental data although the PANS simulation used only fifty percent of the computational nodes compared to the LES. The results of the simulations are used to study the unsteadiness in the flow and identify a dominant frequency of the flow