Velocity and temperature scaling in a rough wall boundary layer

2000 ◽  
Vol 62 (1) ◽  
pp. 640-646 ◽  
Author(s):  
R. A. Antonia ◽  
R. J. Smalley
Keyword(s):  
Boundary Layer ◽  
Rough Wall ◽  
Wall Boundary Layer ◽  
Wall Boundary ◽  
Temperature Scaling

Transitional intermittency in a rough wall boundary layer

PAMM ◽  
2011 ◽  
Vol 11 (1) ◽  
pp. 571-572 ◽  
Author(s):  
Pavel Jonáš ◽  
Ondřej Hladík ◽  
Oton Mazur ◽  
Václav Uruba
Keyword(s):  
Boundary Layer ◽  
Rough Wall ◽  
Wall Boundary Layer ◽  
Wall Boundary

Modeling of Rough Wall Boundary Layer Transition and Heat Transfer on Turbine Airfoils

2006 ◽  
Author(s):  
M. Stripf ◽  
A. Schulz ◽  
H.-J. Bauer
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Boundary Layer Transition ◽  
Rough Wall ◽  
New Model ◽  
Free Stream Turbulence ◽  
Wall Boundary Layer ◽  
Wall Boundary ◽  
Turbine Airfoils

A new model for predicting heat transfer in the transitional boundary layer of rough turbine airfoils is presented. The new model makes use of extensive experimental work recently published by the current authors. For the computation of the turbulent boundary layer a discrete element roughness model is combined with a two-layer model of turbulence. The transition region is modeled using an intermittency equation that blends between the laminar and turbulent boundary layer. Several intermittency functions are evaluated in respect of their applicability to rough-wall transition. To predict the onset of transition a new correlation is presented, accounting for the influence of free-stream turbulence and surface roughness. Finally the new model is tested against transitional rough-wall boundary layer flows on high-pressure and low-pressure turbine airfoils.

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