Similitude laws for the structural response of flat plates under a turbulent boundary layer excitation

2019 ◽  
Vol 129 ◽  
pp. 590-613 ◽  
Author(s):  
Francesco Franco ◽  
Olivier Robin ◽  
Elena Ciappi ◽  
Sergio De Rosa ◽  
Alain Berry ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Structural Response ◽  
Flat Plates

The random structural response due to a turbulent boundary layer excitation

2003 ◽  
Vol 6 (6) ◽  
pp. 437-450 ◽  
Author(s):  
S. De Rosa ◽  
F. Franco ◽  
G. Romano ◽  
F. Scaramuzzino
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Structural Response

Velocity profiles and fence drag for a turbulent boundary layer along smooth and rough flat plates

1976 ◽  
Vol 76 (2) ◽  
pp. 383-399 ◽  
Author(s):  
K. G. Ranga Raju ◽  
J. Loeser ◽  
E. J. Plate
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Boundary Layers ◽  
Roughness Parameter ◽  
Velocity Profiles ◽  
Published Data ◽  
Two Dimensional ◽  
Flat Plates ◽  
Form Drag ◽  
Displacement Thickness

The properties of a turbulent boundary layer were investigated as they relate to the form drag on a two-dimensional fence. Detailed measurements were performed at zero pressure gradient of velocity profiles along smooth, rough and transitional flat plates. Upon comparison with other published data, these measurements resulted in simple formulae for the displacement thickness and the local shear coefficient and in a modification to the universal velocity defect law for equilibrium boundary layers.With these boundary layers, experiments were performed to determine the drag on a two-dimensional fence. These data were analysed along with data from previous investigations. It was found that after suitable blockage corrections all form-drag coefficients for two-dimensional fences collapsed on a single curve if they were calculated with the shear velocity as the reference velocity and plotted against the ratio of the fence height to the characteristic roughness parameter of the approaching flow.

The prediction of turbulent boundary layer development in compressible flow

1968 ◽  
Vol 31 (4) ◽  
pp. 753-778 ◽  
Author(s):  
J. E. Green
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Compressible Flow ◽  
Pressure Rise ◽  
Skin Friction Coefficient ◽  
Empirical Method ◽  
Entrainment Rate ◽  
Flat Plates ◽  
Boundary Layer Development ◽  
Layer Development

Starting from Head's semi-empirical method for incompressible flow, two approaches to the prediction of turbulent boundary-layer development in compressible flow are explored. The first uses Head's incompressible method in conjunction with a compressibility transformation similar to Stewartson's transformation for laminar flow; the second carries over Head's physical arguments to treat the compressible flow directly. Measurements in supersonic flow, both on flat plates and downstream of an abrupt pressure rise, show broad agreement with the predictions of the second method but do not support the compressibility transformation. In particular, measurements on flat plates reveal that as Mach number increases the entrainment rate decreases to a lesser extent than the skin-friction coefficient. Whilst this result is consistent with the second treatment in this paper, it is difficult to reconcile with any of the compressibility transformations discussed, and the validity of these transformations in turbulent flow is therefore questioned.

The Turbulent Boundary Layer Near a Corner

1976 ◽  
Vol 43 (4) ◽  
pp. 567-570 ◽  
Author(s):  
M. Shafir ◽  
S. G. Rubin
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Secondary Flow ◽  
Numerical Solutions ◽  
Main Stream ◽  
Interference Effects ◽  
Flat Plates ◽  
Motion Models ◽  
Secondary Motion ◽  
Layer Behavior

Turbulent boundary-layer behavior in the vicinity of a right-angle corner formed by intersecting flat plates is considered. Due to interference effects a secondary flow is induced. Numerical solutions are obtained for the main stream and secondary motion. Models with and without intermittency factors are considered. It is shown that the secondary motion is significantly different for laminar and turbulent conditions. Similar behavior has previously been observed experimentally.

The effect of convex wall curvature on the structure of the turbulent boundary layer

2009 ◽  
Vol 223 (10) ◽  
pp. 2317-2330 ◽  
Author(s):  
A B Khoshnevis ◽  
S Hariri ◽  
M Farzaneh-Gord
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Numerical Method ◽  
Numerical Results ◽  
Turbulent Shear ◽  
Shear Stresses ◽  
Momentum Exchange ◽  
Flat Plates ◽  
Displacement Thickness ◽  
Convex Wall

Effects of convex wall curvature on turbulent boundary layer flow are studied in this article using a numerical method. Since the non-linear k−ε model often used in engineering applications cannot satisfy the distribution and wall-limiting behaviour of the Reynolds stress components, an improved low Reynolds number k−ε turbulence model has been employed to model turbulences in this study. Based on numerical solutions, turbulent intensity, turbulent shear stress, and mean velocity are calculated. The results show that the turbulent intensities and turbulent shear stresses are decreased on convex walls compared with flat plates under similar conditions. The numerical results also show that for the boundary layer on convex surfaces, the stabilizing effects lead to less turbulent momentum exchange between fluid particles. The rate of integral parameters of the boundary layer such as momentum thickness and displacement thickness is reduced on convex curvature compared to their values on the flat plate. To validate the numerical method, the numerical results have been compared with previous measured values and good agreement has been obtained.

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