Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows

QIU Xiang; HUANG Yong-xiang; LU Zhi-ming; LIU Yu-lu

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Article Navigation > Applied Mathematics and Mechanics > 2009 > 30(2): 149-159

QIU Xiang, HUANG Yong-xiang, LU Zhi-ming, LIU Yu-lu. Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows[J]. Applied Mathematics and Mechanics, 2009, 30(2): 149-159.

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Large Eddy Simulation of Turbulent Statistical and Transport Properties in Stably Stratified Flows

1.
Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, P. R. China;

Received Date: 2008-06-25
Rev Recd Date: 2008-11-14
Publish Date: 2009-02-15

Abstract

Abstract

Three dimensional large eddy simulation (LES) was performed in the investigation of stably stratified turbulence with a sharp thermal interface. Main results are focused on the turbulent characteristic scale, statistical properties, transport properties, and temporal and spatial evolution of the scalar field. Results show that the buoyancy scale increases first, and then goes to a certain constant value. The stronger the mean shear, the larger the buoyancy scale. The overturning scale increases with the flow, and the mean shear improves the overturning scale. The flatness factor of temperature departs from the Gaussian distribution in a fairly large region, and its statistical properties are clearly different from those of the veloaty fluctuations in a strong stratified case. Turbulent mixing starts from small scale motions, and then extends to large scale motions.
- stratified turbulence,
- turbulent mixing,
- turbulent transport,
- turbulence structure

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References(19)

References

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