Scale-resolving PANS simulations of turbulent boundary layers

Scale-resolving simulation (SRS) of the turbulent flat-plate boundary layer (TFPBL) is performed using the partially averaged Navier-Stokes (PANS) approach. The focus of the current study is to examine the ability of PANS method to accurately capture turbulent structures and two-point correlations in wall-bounded flows. The dependence of simulated statistics and flow structure effect on inflow boundary conditions is also examined. Wall-resolved PANS (WR-PANS) method has already been shown to effectively capture flow structure in turbulent channel flows when periodic boundary conditions are employed. The current study demonstrates that PANS in conjunction with recycling/rescaling inflow field not only accurately recover the lag-law behavior but also captures higher-order statistics and flow structures of TFPBL. The development of Tollmien-Schlichting (TS) waves and transport of momentum through the ejection and sweep mechanisms are reasonably simulated in the near-wall region. Overall, it is shown that PANS performs well in wall-bounded turbulent flows at a reasonable computational expense.