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Correlation of the Wall Skin-Friction and Streamwise Velocity Fluctuations in a Turbulent Boundary Layer(I) -Analysis of Long-Time Averaged Space-Time Correlation-
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 Title & Authors
Correlation of the Wall Skin-Friction and Streamwise Velocity Fluctuations in a Turbulent Boundary Layer(I) -Analysis of Long-Time Averaged Space-Time Correlation-
Yang, Jun-Mo; Yu, Jeong-Yeol; Choe, Hae-Cheon;
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 Abstract
A simultaneous measurement of the wall skin friction and near-wall streamwise velocity fluctuations is performed using hot film and hot wire anemometers to investigate the relation between them. Near-wall turbulence statistics measured with a hot-wire probe are in good agreement with previous results. Turbulence properties of the wall skin friction fluctuations measured with a hot film also show fairly good agreements with those measured by others except that rms level is lower in the present study. Long-time averaged space- time correlations show that the wall skin friction is highly correlated with a turbulence structure which is tilted from the wall in the streamwise direction. Tilting angles are obtained from the phase shifts between the wall skin-friction and streamwise velocity fluctuations. The convection velocity of the near-wall streamwise velocity obtained from the space-time correlation is in good agreement with that from the direct numerical simulation database.
 Keywords
Near-Wall Turbulence;Wall Skin-Friction Fluctuation;Streamwise Velocity Fluctuation;Corelation;Tilting Angle;Convection Velocity;
 Language
Korean
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