In this paper we consider the contributions to the streamwise broadband turbulence intensity from large and small scale motions in turbulent boundary layers, where here small-scale refers to motions with wavelengths less than one boundary layer thickness long. How these contributions change with increasing Reynolds number is discussed together with the attenuation effects due to insufficient spatial resolution, particularly in the near-wall region. These considerations are combined with the attached eddy hypothesis to guide a new correction formula that accounts for spatial filtering effects at all wall-normal positions. The new formulation is validated against existing data and is shown to work very well.
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