Calculations of unsteady flows around high-lift configurations based on a zonal approach

Abstract

Zonal approach for unsteady Reynolds-averaged Navier Stokes (URANS) problem solution is described. Original feature of this approach is to use Courant Friedrichs Levi number CFL ∼ 1 in the main part of calculation domain excluding thin part of boundary layer. It is achieved by using explicit numerical scheme with fractional time stepping in the main part of calculation domain. In the near-wall zone of boundary layer, implicit dual stepping method is used. In addition to zonal approach, fully implicit method with dual stepping technology is also implemented. The methods are veri¦ed in comparison with the results of test case data obtained by consortium participants within DeSiReH FP-7 project.

Aerodynamic performance of the DeSiReH high-lift laminar wing at free flight and ETW in-tunnel conditions

“…At §ow regimes beyond the maximum lift, the calculated strategy was more complicated: the ¦eld computed with implicit scheme and local time spepping was used as initial state for zonal method. Detailed discussion of the implementation of zonal approach in DeSiReH project can be found in [6].…”