On similarity and pseudo-similarity solutions of Falkner-Skan boundary layers

Mohamed Guedda (1) , Zakia Hammouch (1)

1 LAMFA - Laboratoire Amiénois de Mathématique Fondamentale et Appliquée

The present work deals with the two-dimensional incompressible,laminar, steady-state boundary layer equations. First, we determinea family of velocity distributions outside the boundary layer suchthat these problems may have similarity solutions. Then, we examenin detail new exact solutions, called Pseudo--similarity, where the external velocity varies inversely-linear with the distance along the surface $ (U_e(x) = U_\infty x^{-1}). The present work deals with the two-dimensional incompressible, laminar, steady-state boundary layer equations. First, we determine a family of velocity distributions outside the boundary layer such that these problems may have similarity solutions. Then, we examenin detail new exact solutions. The analysis shows that solutions exist only for a lateral suction. For specified conditions, we establish the existence of an infinite number of solutions, including monotonic solutions and solutions which oscillate an infinite number of times and tend to a certain limit. The properties of solutions depend onthe suction parameter. Furthermore, making use of the fourth--order Runge--Kutta scheme together with the shooting method, numerical solutions are obtained.

Mots clés: Stretching surfaces; Similarity solutions; Pseudo-similarity solutions; Falkner-Skan problem; Boundary Layer; Stretching surfaces.

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]; Mathématiques générales [math.GM]

Mohamed Guedda, Zakia Hammouch. On similarity and pseudo-similarity solutions of Falkner-Skan boundary layers. Fluid Dynamics Research, 2006, 38 (4), pp.211-223. ⟨10.1016/j.fluiddyn.2005.11.001⟩. ⟨hal-00020230v3⟩