Analysis Study on Convective Boundy Layer Eddy Structure in Water Tank by Orthonormal Wavelet

Ziyun, Chen; Sun, Junqiang; Yuan, Ren‐Ming; Jiang, Wan

doi:10.1002/cjg2.591

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Here, we assume that the heat transport is driven only by temperature gradient, the vapor transport only by vapor gradient and momentum transport only by velocity gradient. Although there are cross-coupling actions among turbulent transportations [5] , these actions become smaller and can be ignored on the presumption that the atmosphere is at a steady state and the underlying surface is flat [6] , which has been proved partly by the observation on boundary layer meteorology [7,8] . So, the assumption can be accepted in the range of atmospheric observational accuracy.…”

Section: Non-linear Thermodynamic Characteristic Of Turbulent Transpomentioning

confidence: 99%

A Study on Nonlinear Thermodynamic Characteristics of Turbulent Transport

Zuo¹,

Yinqiao²

2005

Chinese J. Geophys.

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For the turbulent transport is a kind of irreversible process in thermodynamics, the nonlinear thermodynamics was applied for studying its characteristics. The turbulent transport coefficients are Taylor series of gradient of averaged variables, when the thermodynamic flows are expanded in Taylor series of the thermodynamic forces in the neighborhood of reference state of the equilibrium state. And the linear term of the turbulent transport coefficient corresponds with the turbulent transport coefficient of K closure in Reynolds turbulence closure scheme, and the nonlinear term of the turbulent transport coefficient is the nonlinear effect caused by the departure of system from its thermodynamic equilibrium state. The linear term of the turbulent transport coefficient is positive definite and the turbulent transport makes the system homogenous. When the system is in the nonlinear region far from its thermodynamic equilibrium state, the nonlinear term may become negative and huge enough to make the turbulent transport coefficient negative, this is called as negative gradient turbulent transport. The thermodynamic characteristics of turbulent transport coefficient can provide a thermodynamic closure scheme for the turbulent flow. Based on the minimum entropy production theorem, a recursive relation among the coefficients of Taylor series will be obtained. Utilizing this recursive relation, we can reduce greatly the number of Taylor series coefficients that need to be observed by experiment for determining the Taylor series.

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Section: Non-linear Thermodynamic Characteristic Of Turbulent Transpomentioning

confidence: 99%

A Study on Nonlinear Thermodynamic Characteristics of Turbulent Transport

Zuo¹,

Yinqiao²

2005

Chinese J. Geophys.

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“…Chen et al [30] investigated the coherent structure of atmospheric turbulence in the urban canopy layer with the continuous wavelet transform. On the basis of measuring the turbulent temperature of simulated convective boundary layer in a convection tank, Chen et al [31] performed the denoising and scale decomposition of the obtained turbulent pulse signals with the discrete orthogonal wavelet method, decomposing the raw signals into the two components of isotropic small eddy and large eddy.…”

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Turbulent intensity and its similarity function over an Inner Mongolian grassland during spring

Yue

Niu

Yinqiao³

et al. 2010

Sci. China Earth Sci.

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Macroscopic reason for the development of turbulences in fluid is the conjunction action of velocity and temperature shears. We use the 2008 spring flux observations in the surface layer over Inner Mongolian grassland, obtain the similarity functions of turbulent intensity under different stratification stability conditions, and calculate the clear day turbulent intensity in the spring, which is then analyzed and compared with the observed values of turbulent intensity. The results show that in the Inner Mongolian grassland, under the condition of spring unstable stratification of the surface layer, dependence of the similarity function of turbulent intensity on stratification stability follows a "2/3 power law". The structural function is a constant under the neutral stratification condition, and complicated under the stable condition. The calculated turbulent intensity has a close correlation with the observed one, which verifies the accuracy of the similarity functions and the suitability of the theorem of turbulent intensity in the grassland region. turbulent intensity, variance of velocity, similarity function, grassland Citation:Yue P, Niu S J, Hu Y Q, et al. Turbulent intensity and its similarity function over an Inner Mongolian grassland during spring.

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Analysis Study on Convective Boundy Layer Eddy Structure in Water Tank by Orthonormal Wavelet

Cited by 2 publications

References 15 publications

A Study on Nonlinear Thermodynamic Characteristics of Turbulent Transport

A Study on Nonlinear Thermodynamic Characteristics of Turbulent Transport

Turbulent intensity and its similarity function over an Inner Mongolian grassland during spring

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