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Shear effects in nonhomogeneous turbulence
Toschi1, Leveque, Ruiz-Chavarria
1Department of Applied Physics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands INFM, Unita di Tor Vergata, Roma, Italy.
Physical Review Letters
|September 6, 2000
Summary
A new model for intermittency in turbulent shear flows is proposed using integral structure functions (ISF). This approach reveals a universal scaling behavior, consistent with experimental and numerical data.
Area of Science:
- Fluid Dynamics
- Turbulence Research
- Nonlinear Dynamics
Background:
- Turbulent shear flows exhibit complex intermittent behavior.
- Existing models struggle to universally capture intermittency across different shear intensities.
- Recent experimental and numerical data highlight the need for a unifying theoretical framework.
Purpose of the Study:
- To propose a simple, unifying picture for intermittency in turbulent shear flows.
- To introduce Integral Structure Functions (ISF) that account for shear intensity.
- To investigate the potential for universal scaling in ISF.
Main Methods:
- Development of phenomenological Integral Structure Functions (ISF).
- Inclusion of shear intensity as a key parameter in ISF.
- Comparison of ISF predictions with existing experimental and numerical data.
Main Results:
- ISF demonstrate a universal scaling behavior.
- This scaling is independent of the specific shear intensity.
- The proposed picture shows good agreement with experimental and numerical findings.
Conclusions:
- A unifying picture for intermittency in turbulent shear flows has been established using ISF.
- The findings suggest potential extensions to convective turbulence.
- Implications for closure conditions in large-eddy simulations of nonhomogeneous flows are discussed.