Abstract
Measured spectra ofθ x,θ y,θ z, the derivatives of temperature in streamwise, lateral and vertical directions, respectively, indicate that the spectral densities ofθ z andθ y are nearly similar but significantly different from the spectral density ofθ x. The high-frequency parts of the three spectra satisfy, in a qualitative sense, local isotropy requirements. In the high-frequency end of the inertial subrange, the relative behaviour of spectra ofθ x,θ y andθ z is also consistent with local isotropy.
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References
Antonia, R. A., Phong-Anant, D., Rajagopalan, S., and Chambers, A. J.: 1978, ‘Properties of Spatial Temperature Derivatives in the Atmospheric Surface Layer’, T. N. FM24, Department of Mechanical Engineering, University of Newcastle.
Sreenivasan, K. R., Danh, H. Q., and Antonia, R. A.: 1977, ‘Temperature Dissipation Fluctuations in a Turbulent Boundary Layer’,Phys. Fluids,20, 1238–1249.
Van Atta, C. W.: 1977, ‘Second-Order Spectral Local Isotropy in Turbulent Scalar Fields’,J. Fluid Mech. 80, 609–615.
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Antonia, R.A., Chambers, A.J. Spectra of temperature derivatives in the atmospheric surface layer. Boundary-Layer Meteorol 15, 341–345 (1978). https://doi.org/10.1007/BF02652605
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DOI: https://doi.org/10.1007/BF02652605