Direct numerical simulation of the turbulent boundary layer over the Boeing bump at Re_L=2M

The turbulent boundary layer over a two-dimensional Gaussian-shaped bump is computed by direct numerical simulation (DNS) of the incompressible Navier–Stokes equations. At the inflow, the momentum thickness Reynolds number is approximately 1900 and the boundary layer thickness is 1/9 of the bump height. At this Reynolds number, the flow does not experience significant re-laminarization and the resulting flow experiences a large separation soon after the bump peak where the pressure gradient switches from favorable to adverse. A review of the strong pressure gradient flow physics from past presentations will be included, however this talk will focus on the strong adverse pressure gradient and separated regions on the downstream side of the bump. Owing to the slower time scales and the demand for a wider domain width to avoid confinement issues, convergence of statistical quantities of interest has required a substantial increase in computational resources.