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Aeolian transport with collisional suspension
José Miguel Pasini1, James T Jenkins
1Department of Theoretical and Applied Mechanics, Cornell University, Ithaca, NY 14853, USA.
Summary
This study models strong wind sand transport where grain collisions are unavoidable. The improved model incorporates turbulence, viscous effects, and new boundary conditions, validated by trajectory simulations.
Area of Science:
- Geophysics
- Fluid Dynamics
- Sediment Transport
Background:
- Aeolian sand transport is crucial for arid environments.
- High wind speeds lead to dense granular flows near the surface.
- Existing models often simplify grain-grain interactions.
Purpose of the Study:
- To develop an improved model for collisional aeolian sand transport.
- To incorporate key physical processes like turbulent suspension and viscous dissipation.
- To validate the model with numerical simulations.
Main Methods:
- Developed a new mathematical model for dense granular flow.
- Included terms for turbulent suspension and viscous dissipation.
- Validated model boundary conditions using collisionless trajectory calculations.
Main Results:
- The improved model captures the physics of high-concentration sand transport.
- Numerical validation confirmed the accuracy of the new boundary conditions.
- The model provides a more realistic representation of wind-driven sand movement.
Conclusions:
- The enhanced model offers a better understanding of aeolian sediment dynamics.
- This work advances the simulation of sand transport under strong wind conditions.
- Findings are relevant for geomorphology and wind erosion studies.