Flow Past a Backward-Facing Step: Comparison of PANS, DES and URANS Results with Experiments Academic Article uri icon


  • Flow past a backward-facing step is computed using three different turbulence modeling approaches; Detached Eddy Simulation (DES), Unsteady Reynolds Averaged Navier-Stokes (URANS), and the newly developed Partially Averaged Navier-Stokes (PANS) [1, 2] method. PANS is a family of closure models parameterized by different ratios of resolved-to-modeled kinetic energy and dissipation. The corresponding resolution control parameters are fk (the ratio of unresolved to total kinetic energy) and f (the ratio of unresolved-to-total dissipation). The main objectives of this study are: (i) to investigate the merits of PANS relative to the other two methods by comparing against existing experimental data; and (ii) to examine the effect of the PANS parameter f on the computed flow field. In addition, we study the sensitivity of PANS results to grid-size and the level of unsteadiness in the inflow. Overall, the results clearly demonstrate the suitability of PANS for computing unsteady turbulent flows at a reasonable computational expense.

published proceedings

  • International Journal for Computational Methods in Engineering Science and Mechanics

author list (cited authors)

  • Frendi, A., Tosh, A., & Girimaji, S.

citation count

  • 42

complete list of authors

  • Frendi, Abdelkader||Tosh, Abhijit||Girimaji, Sharath

publication date

  • December 2006