NATO STO

Experimental and computational fluid dynamics of high Reynolds number turbulent boundary layers under existing conditions. Efforts will first focus on experiments and computations of (a) two dimensional zero pressure gradient boundary layers over rough walls, and (b) two-dimensional boundary layers over smooth walls with pressure gradient. In a second phase the group will focus on systematically adding additional non-equilibrium effects to each of these. Specifically, the study of rough wall boundary layers will be extended to cases that consider either heterogenous roughness, pressure gradient or dynamic roughness. The study of boundary layers in pressure gradients will be extended to cases that consider either lateral curvature, complex curvature or roughness. Existing or planned experimental data sets have already been identified that address each of these non-uniformities. The computational methods to be employed will range from low-order models, through RANS to time resolving simulations including methods currently being used in defence-funded laboratories. Invited group members include those with existing computational methods that cover this range, as well as those with experience in employing these methods to military vehicles.