Evaluation of Partially-Averaged Navier-Stokes (PANS) bridging method in turbulent channel flows

The Partially-Averaged Navier-Stokes (PANS) variable-resolution turbulence computational method is intended for seamless bridging between Reynolds-Averaged Navier-Stokes (RANS) and Direct Numerical Solution (DNS). While the success of PANS has been well documented in separated flows with largescale instabilities, its performance in wall-bounded flows is yet to be demonstrated. Toward that end, we perform channel flow simulations using the PANS $\zeta $-f closure which is based on the near-wall RANS $\zeta$-f model. The filter width is controlled by specifying the appropriate control parameters, unresolved-to-total ratios of turbulent kinetic energy and frequency. Computations are performed with three different grids (filter-widths) for the case of Re$_{\tau}$ = 650. Direct Numerical Simulation and Large eddy simulation data are used for comparison and evaluation. The results clearly demonstrate that PANS performs well in near-wall turbulent flows as well.