A Theoretical Model for the Study of Convective Turbulence Decay and Comparison with Large-Eddy Simulation Data
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- 作者：A. Goulart ; G. Degrazia ; U. Rizza and D. Anfossi
- 关键词：Convective boundary layer ; Kinetic energy ; Large ; eddy simulation ; Spectrum ; Turbulence decay
- 刊名：Boundary-Layer Meteorology
- 出版时间：2003
- 出版年：2003
- 期刊代码：15_00068314
- 类别：mat
- 卷：107
- 期：1
- 页码：143-155
- 数据来源：sp
摘要
The development of a theoretical model fora decaying convective boundary layeris considered. The model relies on thedynamical energy spectrumequation in which the buoyancy andinertial transfer terms are retained,and a closure assumptionmade for both. The parameterization for thebuoyancy term is given providing a factorizationbetween the energy source termand its temporal decay. Regarding the inertialtransfer term a hypothesis ofsuperposition is used to describe theconvective energy source and time variationof velocity correlation separately.The solution of the budget equation for theturbulent kinetic energy spectrum is possible,given the three-dimensional initial energyspectrum. This is doneutilizing a version of the Kristensen et al.(see Boundary-Layer Meteorol.47, 149–193)model valid for non-isotropic turbulence. During thedecay the locus of the spectralpeak remains at about the sameposition as the heat flux decreases.Comparison of the theoretical modelis performed against large-eddy simulationdata for a decaying convectiveboundary layer.