Abstract
Leading edge receptivity of a laminar boundary layer is investigated with Direct Numerical Simulation of a 2D incompressible flow. The code is written for the primitive variables calculated at the same collocation points. The equations are discretized with a second order scheme in time and in space. A first scries of computations has been done with a domain fully located on the flat plate. The forced Stokes layer solution is imposed at the entry and the simulation finally gives in addition to this Stokes layer a supplementary eigensolution which corresponds exactly to a Tollmien-Schlichting wave. But the small amplitude of the latter seems dependent on the time scheme. A second series of computations including the leading edge gave better results. Firstly the Stokes layer is very well simulated, secondly very small eigenmodes (10-5) have been obtained, the amplitude of which only depends on the frequency.
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