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Título: | Intermittent Lagrangian velocities and accelerations in three-dimensional porous medium flow |
Autor: | Holzner, Markus; Morales, Verónica L.; Willmann, Matthias; Dentz, Marco CSIC ORCID | Palabras clave: | Continuous time systems Lagrange multipliers Porous materials Random processes |
Fecha de publicación: | 17-jul-2015 | Editor: | American Physical Society | Citación: | Physical Review - Section E - Statistical Nonlinear and Soft Matter Physics 92(1): Article number 013015 (2015) | Resumen: | Intermittency of Lagrangian velocity and acceleration is a key to understanding transport in complex systems ranging from fluid turbulence to flow in porous media. High-resolution optical particle tracking in a three-dimensional (3D) porous medium provides detailed 3D information on Lagrangian velocities and accelerations. We find sharp transitions close to pore throats, and low flow variability in the pore bodies, which gives rise to stretched exponential Lagrangian velocity and acceleration distributions characterized by a sharp peak at low velocity, superlinear evolution of particle dispersion, and double-peak behavior in the propagators. The velocity distribution is quantified in terms of pore geometry and flow connectivity, which forms the basis for a continuous-time random-walk model that sheds light on the observed Lagrangian flow and transport behaviors. ©2015 American Physical Society. | Versión del editor: | 10.1103/PhysRevE.92.013015 | URI: | http://hdl.handle.net/10261/140782 | DOI: | 10.1103/PhysRevE.92.013015 |
Aparece en las colecciones: | (IDAEA) Artículos |
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3dporescaleexp_postprint.pdf | 1,85 MB | Adobe PDF | Visualizar/Abrir |
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