Réceptivité localisée de la couche limite

Abstract

An investigation of the generation of Tollmien-Schlichting waves has been carried out with the direct numerical simulation PEGASE code developed at ONERA. The latter was allowed to visualise these waves in a two-dimensional incompressible flow around a roughness element placed on a flat plate, the incoming flow having the form: U_∞ = U₀(1ɛ cos ωt). Quantitative results on the influence of ɛ, and of the dimensions h and l of the rectangular hump on these waves are obtained from a parametric study. These results show good agreement with previous experimental and theoretical studies.