Quantifying the dynamics of flow within a permeable bed using time-resolved endoscopic particle imaging velocimetry (EPIV)
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- Blois, G., Sambrook Smith, G.H., Best, J.L. et al. Exp Fluids (2012) 53: 51. doi:10.1007/s00348-011-1198-8
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This paper presents results of an experimental study investigating the mean and temporal evolution of flow within the pore space of a packed bed overlain by a free-surface flow. Data were collected by an endoscopic PIV (EPIV) technique. EPIV allows the instantaneous velocity field within the pore space to be quantified at a high spatio-temporal resolution, thus permitting investigation of the structure of turbulent subsurface flow produced by a high Reynolds number freestream flow (Res in the range 9.8 × 103–9.7 × 104). Evolution of coherent flow structures within the pore space is shown to be driven by jet flow, with the interaction of this jet with the pore flow generating distinct coherent flow structures. The effects of freestream water depth, Reynolds and Froude numbers are investigated.
Online Resource 1 Sequence of images of instantaneous flow fields showing the evolution of flow driven by a downstream jet leading to formation of a vortical pathway. Supplementary material 1 (AVI 22777 kb)
Online Resource 2 Sequence of images of instantaneous flow fields showing the evolution of flow triggered by a spanwise jet leading to formation of a large vortical structure, whose evolution is driven by fluid motion that is first downstream and then upstream. Supplementary material 2 (AVI 6537 kb)