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- Title
Conditions of Similarity of the Cross-Spectra of Pseudosound Pressures in Turbulence.
- Authors
Tkachenko, V. M.
- Abstract
Nondimensional cross-spectra of pseudosound wall-pressures in turbulence are considered in the framework of model fields of progressively increasing complexity. Conditions for the existence of the similarity of the nondimensional cross-spectra for frequency and spacing are studied; factors that lead to the violation of this similarity are considered. It is shown that, for the similarity of both longitudinal and transverse spectra, a wide distribution of the field energy in the wave numbers is necessary in combination with a small dispersion of the transport velocity of the wave components of the field. For the longitudinal spectrum, this condition is also a sufficient one. For the similarity of the transverse spectrum, the wave-number spectrum of the field should have some special form. The absence of the field energy in some region of the wave space leads to the violation of similarity of the cross-spectra at the corresponding frequencies. The results of the calculations of the longitudinal and transverse spectra are presented. The calculations are performed in the framework of the proposed model; they illustrate the effects of different parameters of the field on the properties of the crossspectra.
- Subjects
ACOUSTIC radiation pressure; TURBULENCE
- Publication
Acoustical Physics, 2000, Vol 46, Issue 3, p348
- ISSN
1063-7710
- Publication type
Article
- DOI
10.1134/1.29891