Logarithmic scaling for fluctuations of a scalar concentration in wall turbulence.
basic_science · Level V
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- Record sourced from PubMed, PMID 29347306.
- Also identified by DOI 10.1103/PhysRevE.96.063101.
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Abstract
Within wall turbulence, there is a sublayer where the mean velocity and the variance of velocity fluctuations vary logarithmically with the height from the wall. This logarithmic scaling is also known for the mean concentration of a passive scalar. By using heat as such a scalar in a laboratory experiment of a turbulent boundary layer, the existence of the logarithmic scaling is shown here for the variance of fluctuations of the scalar concentration. It is reproduced by a model of energy-containing eddies that are attached to the wall.