RATIONAL EXTENSION OF THE CLAUSER EDDY VISCOSITY MODEL TO COMPRESSIBLE BOUNDARY-LAYER FLOW

An extension of the Clauser eddy viscosity model for the outer part of a compressible, turbulent boundary layer is proposed. This extension, unlike all of the previous ones, is based on a derivation, and not on ad hoc assumptions. The logic of the derivation of the original model is followed, except that the Crocco integral and the Howarth-Dorodnit syn transformation are used for the purpose of the comparison with the velocity defect law. Predictions with the new model and two earlier a d hoc extensions of the Clauser model are compared to measured data. I mproved predictions are obtained with the new model for both the outer part of the layer and the skin friction coefficient.