In this study, turbulent statistics of flow on gravel beds are described by using the laws of turbulence in conjunction with the Double-Averaging Methodology (DAM). For this purpose, an experimental campaign in a laboratory flume was performed. Applying the Taylor frozen-in hypothesis to the Kolmogorov 4/5-law for the spatial increments of the streamwise velocity, it is revealed the existence of the well-known inertial subrange and an accurate Turbulent Kinetic Energy (TKE) dissipation rate ε assessment is obtained. The present work shows the validity of this statistical methodology (Kolmogorov’s 4/5-law) to study the turbulence characteristics at small scales.

Estimation of the energy dissipation rate with the Kolmogorov 4/5-law in turbulent flows on gravel beds

COSCARELLA F.
;
PENNA N.;SERVIDIO S.;GAUDIO R.
2022

Abstract

In this study, turbulent statistics of flow on gravel beds are described by using the laws of turbulence in conjunction with the Double-Averaging Methodology (DAM). For this purpose, an experimental campaign in a laboratory flume was performed. Applying the Taylor frozen-in hypothesis to the Kolmogorov 4/5-law for the spatial increments of the streamwise velocity, it is revealed the existence of the well-known inertial subrange and an accurate Turbulent Kinetic Energy (TKE) dissipation rate ε assessment is obtained. The present work shows the validity of this statistical methodology (Kolmogorov’s 4/5-law) to study the turbulence characteristics at small scales.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/337062
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