V.G.Kuzmenko Numerical simulation of turbulent boundary layer behind vortex structures destructors |
Applied hydromechanics, Vol. 11 (83) ¹ 1, (2009) |
| The turbulent boundary layer on a flat plate behind vortex structures destructors (device ``tandem'') is simulated by LES-technique for a Reynolds numbers of Re=12934 and Rex= {940000-1252884}. The large-scale flow field has been obtained by directly integrating the filtered three-dimensional time-dependent incompressible Navier-Stokes equations using a finite-difference method. The small-scale motions were parametrized by dynamic subgrid-scale mixed model. The number of grid points used in the numerical method was 673 x 97 x 193 . The simulation were performed to study the mean velocity, the turbulent stresses, the turbulence kinetic energy, skin friction coefficient and subgrid-scale-model effects. The vortex structures destructors (device ``tandem'') decreases the skin friction coefficient by up to 15 % (in comparison to the turbulent boundary layer without vortex structures destructors). There is good agreement between the computer mean-velocity profiles, turbulence statistics and experimental data. |
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KEY WORDS: *** |
| TEXT LANGUAGE: Russian |