1. Drag on intruders in granular beds: A boundary layer approach.
- Author
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Goldsmith, Jonathan, Hong Guo, Hunt, Shelby N., Mingjiang Tao, and Koehler, Stephan
- Subjects
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DRAG (Aerodynamics) , *GRANULAR materials , *BOUNDARY layer (Aerodynamics) , *MATHEMATICAL models , *NUCLEAR cross sections , *MONOMOLECULAR films , *INTEGRALS - Abstract
We performed a parametric study of the drag on vertical intruders with uniform cross sections of different sizes and shapes, from which we developed a semiempirical model. Baffling techniques were used to isolate the contributions of the intruder's different subsurfaces, and we observed size effects and force focusing on edges. We propose a boundary layer approach, whereby the drag is the surface integral of an effective stress over a monolayer of particles contacting the intruder. The stress has a simple lithostatic dependence and is a function of the orientation relative to the intruder's direction of motion. This approach is experimentally verified and is consistent with the semiempirical model. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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