Influence of humps and steps on the stability characteristics of a 2d laminar boundary layer

2002 ◽  
Author(s):  
U. Rist ◽  
S. Wagner ◽  
A. Woerner
Keyword(s):  
Boundary Layer ◽  
Laminar Boundary Layer ◽  
The Stability

Note on the stability of a boundary layer on a concave wall with suction

1972 ◽  
Vol 52 (2) ◽  
pp. 269-272 ◽  
Author(s):  
Ryoji Kobayashi
Keyword(s):  
Boundary Layer ◽  
Growth Factors ◽  
Laminar Boundary Layer ◽  
Critical Values ◽  
Permeable Wall ◽  
Neutral Stability ◽  
Momentum Thickness ◽  
Longitudinal Vortices ◽  
Concave Wall ◽  
The Stability

The purpose of this paper is to consider theoretically how the homogeneous suction from a slightly concave permeable wall will affect the instability of the laminar boundary layer to the onset of longitudinal vortices. The curves of neutral stability and of several growth factors of the vortices are given. The critical values of the Görtler parameter Gc, and the wavenumber σc, based on the momentum thickness of the boundary layer, are found: Gc = 1·17 and σc = 0·22.

Stability of a Laminar Boundary Layer Flowing Along a Concave Surface

1989 ◽  
Vol 111 (4) ◽  
pp. 376-386 ◽  
Author(s):  
M. V. Finnis ◽  
A. Brown
Keyword(s):  
Boundary Layer ◽  
Laminar Boundary Layer ◽  
Streamwise Velocity ◽  
Wave Number ◽  
Radius Of Curvature ◽  
Normal Velocity ◽  
Mean Flow ◽  
Boundary Layer Flows ◽  
The Stability ◽  
The Galerkin Method

Go¨rtler instability for incompressible laminar boundary-layer flows over constant curvature concave surfaces is considered. The full linearized disturbance equations are solved by the Galerkin method using Chebyshev polynomials to represent the disturbance functions. Stability curves relating Go¨rtler number, wave number, and vortex amplification for a Blasius mean flow are presented. The effect of streamwise pressure variation is investigated using the Falkner–Skan boundary-layer solutions for the mean flow. The importance of including the normal velocity terms for these flows is shown by their effect on the stability curves. The streamwise velocity distribution in the boundary layer on a 3-m radius of curvature plate was investigated experimentally. The results are compared with the stability curves and predicted disturbance functions.

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