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Influence of wall riblets on diffuser flow

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Diffuser flows have been investigated with different riblet combinations both experimentally and numerically. Wall pressures and velocity profiles have been measured throughout a large working domain. In addition numerical calculations have been performed by accounting for the strong coupling between the inviscid core flow and the viscous boundary layer flows by using a simple model based on the negative roughness for the riblet walls.

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c f :

skin friction coefficient

p :

local static pressure

x :

streamwise distance

y :

distance normal to the wall

u τ :

friction velocity

A :

diffuser cross section

H :

shape factor

U e :

fluid velocity in inviscid flow

W 1 :

inlet height of the diffuser


boundary layer displacement thickness

ϱ :

density of working fluid


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Institut de Machines Hydrauliques et de Mecanique des Fluides

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Truong, T.V., Pulvin, P. Influence of wall riblets on diffuser flow. Applied Scientific Research 46, 217–227 (1989). https://doi.org/10.1007/BF00404819

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  • Boundary Layer
  • Simple Model
  • Numerical Calculation
  • Velocity Profile
  • Strong Coupling