Volume 79, Number 4, August 2007
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||26 July 2007|
Scaling of mixed longitudinal-transverse velocity structure functions
School of Civil Engineering, University of Sydney - NSW 2006, Australia
2 Discipline of Mechanical Engineering, University of Newcastle - NSW 2308, Australia
Accepted: 3 July 2007
Measurements in a turbulent round jet at a Taylor microscale Reynolds number of about 500 indicate that the mixed structure functions of u, the longitudinal velocity fluctuation, and v, the transverse velocity fluctuation, show a larger departure from the Kolmogorov scaling than the u structure functions, and a smaller departure than the v structure functions. Although the scaling exponents of the temperature structure functions are nearly equal to those of the v structure functions at a comparable order, the mixed structure functions of u and the temperature fluctuation exhibits a smaller departure from the Kolmogorov scaling than either u or structure functions at the same order. The difference between the scaling behaviour of these two mixed structure functions mainly reflects the difference in correlation between and either or , implying that there is an important difference between temperature and velocity fields.
PACS: 47.27.wg – Turbulent jets / 47.27.-i – Turbulent flows
© Europhysics Letters Association, 2007
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