Crossflow in turbulent boundary layers

Abstract

Two well known representations for the crossflow velocity profile, due to Mager and Johnston, are discussed, and limitations to their applicability are outlined. A number of ideas relating to the Johnston triangular model are discussed and a method for extending its usefulness is presented. Finally an approach which should lead to a prediction of the form of cross-over crossflow profiles (where the sign of the crossflow changes through the depth of the layer) is described. The predictions are shown to be consistent with the available measured profiles.