On the Convection Velocity of Wall-Bounded Turbulence Resolved by ZDES Mode III at Re_θ= 13000

摘要

1 Short Discussion of the Need and Options for Wall-Modelled Large Eddy Simulation in Applied Aerodynamics In applied aerodynamics, the increasing demand for the prediction of phenomena such as mild flow separations, strongly out of equilibrium boundary layers, aeroa-coustics or unsteady loading may require a more detailed and universal description than the mean values provided by Reynolds Averaged Navier-Stokes models, motivating turbulence-resolving approaches of wall-bounded flows. However, in high Reynolds number attached turbulent boundary layers in most aerospace applications (Reτ ≈ 10~4 - 10~5), the numerical cost of Direct Numerical Simulation, and even of Wall-Resolved Large Eddy Simulation, is prohibitive because of the lack of scale separation in the near-wall region. Introducing wall models and resolving the outer layer dynamics, the number of grid points for Wall-Modelled Large Eddy Simulation is approximately proportional to the square root of the number of points for DNS (see [61), making WMLES affordable in applied aerodynamics at high Reynolds numbers.