Authors’ reply☆
Introduction
The authors of Ref. [1] would like to acknowledge the consideration Smol’yakov and Tkachenko gave to their comments. As a preliminary, it should be noted that the aim of this publication is to propose a novel, alternative model established on a thorough set of experiments and interpretations, hoping that some members of the research community may find it useful. With this intention, the authors attempted to define a set of fundamental parameters that determine the properties of a fluctuating surface pressure field in a low Mach number turbulent boundary layer. The importance and legitimacy of all previous work is by no means questioned in this paper, which should be seen as a proposed contribution to the advancement of knowledge in its area.
Section snippets
Erratum
The authors of Ref. [1] wish to apologise to the readers for their mistake in the legend of their Fig. 14, which, as pointed out by Smol’yakov and Tkachenko, and also in the main text of Ref. [1], represents coherence in the transverse direction. However, the models are not misrepresented in the legends of Figs. 13 and 14. It is possible that the dashed and dotted lines could be confused. To overcome the difficulty to distinguish between these two lines, the main text of the original paper
Limitations of the proposed model
In his fundamental publication, Corcos [3] proposes the following model for the surface pressure field cross spectral density Spp as a function of the radian frequency ω, and ξ and η, the streamwise and spanwise separation distances, respectively, as the product of three functions:where φ is the point surface pressure power spectral density, γξ and γη are the coherence functions in the streamwise and spanwise directions respectively, and Uc is the
Conclusion
Based on an extensive set of experimental data, the authors of Ref. [1] investigated the wall-pressure field beneath a turbulent boundary layer at low and medium frequencies, which led to the formulation of a novel model. This model includes variations from previously published models and new forms of variable normalization, which made it worthy of publication. These variations were only proposed when it was felt that they were strongly supported by empirical results obtained from a careful
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Reply to doi:10.1016/j.jsv.2003.09.058.