An extended rough-wall model for an integral boundary layer model intended for ice accretion calculations

摘要

An integral model was developed for computing the effects of roughness on skin friction and heat transfer coefficient on iced airfoils. This model was derived from the recent model of Aupoix for RANS approaches, and adapted to the framework of integral boundary layer methods. Most icing suites are based on such methods. Besides, the baseline approach generally used in icing suites for modelling the effects of roughness is based on Kays and Crawford method. The Aupoix-Grigson-Colebrook (AGC) integral method is derived in the present paper. It is compared to the baseline integral approach on the set of Dukhan's rough flat-plate experiments. Preliminary simulations of an iced airfoil are also presented in order to assess the AGC integral model and give some recommendations for its future use.