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Intermediate Strain Rate Material Characterization with Digital Image Correlation
Published on: March 1, 2019
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Extra Strain Rates in an unsteady spilling breaking wave.
Alessia Lucarelli1, Claudio Lugni2,3, Massimo Falchi1
1CNR-INSEAN & Marine Technology Center - Italian Research Council, Roma, 00128, Italy.
Scientific Reports
|September 19, 2018
Summary
Flow curvature in unsteady spilling breakers induces extra strain rates comparable to simple shear. This finding is crucial for improving turbulence models in fluid dynamics research.
Area of Science:
- Fluid Dynamics
- Turbulence Modeling
- Coastal Engineering
Background:
- Unsteady spilling breakers generate complex turbulent mixing layers.
- Existing turbulence closure models often simplify flow geometry, neglecting curvature effects.
Purpose of the Study:
- To quantify extra strain rates caused by streamline curvature in unsteady spilling breakers.
- To assess the significance of these strain rates for turbulence closure models.
Main Methods:
- Analytical formulation for thin turbulent layers.
- Experimental data acquisition using Particle Image Velocimetry (PIV).
- Comparison of analytical predictions with experimental measurements.
Main Results:
- Streamline curvature induces extra strain rates of comparable magnitude to simple shear.
- These curvature-induced strain rates differ significantly from geometric curvature effects and hydraulic jump models.
Conclusions:
- Flow curvature is a significant factor in unsteady breaker mixing layers.
- Algebraic turbulence closures require accounting for these extra strain rates for improved accuracy.
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