Global ETD Search
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Showing 1 to 5 of 5 for “"irregular roughness"”.
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Experimental Investigation of Highly Irregular Roughness Effects in Wall Turbulence
… the smooth wall, both within and outside the roughness sublayer, to further assess the possibility of structural modifications due to roughness. Hairpin vortex packets, commonly observed in smooth-wall turbulence, are observed often in the outer layer of the rough-wall flow. As in smooth-wall …
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Combined irregular roughness and favorable-pressure-gradient effects in a turbulent boundary layer
… study of the combined impact of highly irregular surface roughness and moderate favorable-pressure-gradient (FPG) conditions on the structure of a turbulent boundary layer was assessed using two-dimensional particle image velocimetry (PIV) measurements in the streamwise{ wall-normal …
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Cross-plane stereo-PIV measurements of a turbulent boundary layer over highly irregular roughness
… a turbulent boundary layer overlying a complex roughness topography were explored with stereo particle-image velocimetry measurements in the wall-normal--spanwise plane. The roughness under consideration was replicated from a turbine blade damaged by deposition of foreign materials containing a …
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Experimental Study of Low-Order Models of Highly-Irregular Roughness and Their Impact on Turbulent Boundary Layers
The stereo-PIV measurements deep within the roughness sublayer at y = 0.047delta reveal a wealth of information about roughness-induced effects, including the tendency of the roughness to promote 'channeling' of the flow in the form of low- and high-momentum pathways as noted in contour maps of the …
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Experimental study of low-order models of highly-irregular roughness and their impact on turbulent boundary layers
… of various topographical scales present within irregular surface roughness on a turbulent boundary layer under both developing- and developed-flow conditions. Low-order representations of highly irregular surface roughness replicated from a turbine-blade damaged by deposition of foreign …