An Experimental Investigation of the Brinkman Layer Thickness at a Fluid-Porous Interface

Goharzadeh, Afshin; Saidi, Arash; Wang, Dianchang; Merzkirc, Wolfgang; Khalil, Arzhang

doi:10.1007/978-1-4020-4150-1_43

Cited by 15 publications

(8 citation statements)

References 12 publications

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“…These flows result in intense turbulent fluctuations in the hyporheic flow within the pore spaces in the Brinkman layer (defined as the transition layer between the fully turbulent flow and the deeper groundwater Darcian flow, Goharzadeh et al . []). As such, the role of bed forms in both inducing and driving hyporheic flow has been recognized previously [ Stonedahl et al ., ] and investigated through the use of numerical models [ Boano et al ., ; Cardenas and Wilson , , ; Packman et al ., ; Hester et al ., ].…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation into the importance of bed permeability on determining flow structures over river dunes

Sinha

Hardy

Blois

et al. 2017

Water Resources Research

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Although permeable sediments dominate the majority of natural environments past work concerning bed form dynamics has considered the bed to be impermeable, and has generally neglected flow between the hyporheic zone and boundary layer. Herein, we present results detailing numerically modeled flow which allow the effects of bed permeability on bed form dynamics to be assessed. Simulation of an isolated impermeable bed form over a permeable bed shows that flow is forced into the bed upstream of the dune and returns to the boundary layer at the leeside, in the form of returning jets that generate horseshoe‐shaped vortices. The returning flow significantly influences the leeside flow, modifying the separation zone, lifting the shear layer adjoining the separation zone away from the bed. Simulation of a permeable dune on a permeable bed reveals even greater modifications as the flow through the dune negates the formation of any flow separation in the leeside. With two dunes placed in series the flow over the downstream dune is influenced by the developing boundary layer on the leeside of the upstream dune. For the permeable bed case, the upwelling flow lifts the separated flow from the bed, modifies the shear layer through the coalescence with vortices generated, and causes the shear layer to undulate rather than be parallel to the bed. These results demonstrate the significant effect that bed permeability has on the flow over bed forms that may be critical in affecting the flux of water and nutrients.

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Section: Introductionmentioning

confidence: 99%

A numerical investigation into the importance of bed permeability on determining flow structures over river dunes

Sinha

Hardy

Blois

et al. 2017

Water Resources Research

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“…The proposed teaching PIV system can also be used for studying laminar flow in more complex experiments. For example, Goharzadeh et al 10,11 utilized a similar PIV system combined with Refractive Index Matching (RIM) to investigate the flow near the interface between a fluid and the saturated porous layer underneath. The laminar flow at the fluid porous interface was characterized and the thickness of a transitional region (Brinkman Layer) was measured and compared with theoretical results.…”

Section: Flow Visualization Over An Immerged Bodymentioning

confidence: 99%

A Proposed Particle Image Velocimetry (Piv) System For Instructional Purposes In A Modern Mechanical Engineering Undergraduate Laboratory Program

Goharzadeh¹,

Molki²,

Ohadi³

2006 Annual Conference &Amp; Exposition Proceedings

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Havre in France (2001). After his Ph.D. he joined the prestigious Max Planck Institute for Marine Microbiology in Bremen (Germany) as scientific researcher. He characterized experimentally the flow at water-sediment interface. Using the Particle Image Velocimetry (PIV) and Refractive Index Matching (RIM), he measured the velocity of fluid particles at fluid-porous interface and estimated the thickness of the transition layer (Brinkman Layer Thickness) inside the transparent porous media. Arman Molki, The Petroleum Institute ARMAN MOLKI is a laboratory engineer at the department of mechanical engineering at the Petroleum Institute. He earned his degree in computer science from the University of Maryland, College Park. His main interests are computer-based data acquisition and computer aided design. He is a member of ASME. Michael Ohadi, The Petroleum Institute MICHAEL OHADI, Ph.D., is a professor of mechanical engineering and the acting chief academic officer at the Petroleum Institute. An internationally recognized authority in enhanced heat and mass transfer, has published over 140 refereed technical papers, is a fellow member of both ASME and ASHRAE, and has won numerous awards from both societies.

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“…However, vertical ROMS velocities affected only smaller particles (see section 3.3) and they are negligibly small compared to sinking velocities for larger tracers (Figure 3). Particle interactions in the water column and in suspension in the BBL as well as particle flocculation are not taken into account because this would go beyond the scope of this parameter sensitivity study [e.g., Khalili et al , 2001; Goharzadeh et al , 2005].…”

Section: Model Setupmentioning

confidence: 99%

Modeling sediment transport patterns during an upwelling event

Huhn¹,

Paul²,

Seyferth³

2007

J. Geophys. Res.

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[1] Being one of the most outstanding hydrodynamic processes at ocean margins, upwelling is not only a key factor controlling bioproduction but also acts as a driving mechanism for sediment transport. In order to quantify its capability to erode and transport sedimentary particles without being masked by other oceanographic processes, we present a numerical model only forced by surface wind drag. Thereby, transport of particles is not only controlled by upwelling circulation, but also by their physical properties as well as time and location of release into the water column. The study combines a hydrodynamic finite difference model and Lagrangian particle tracing technique. Model geometry mimics a two-dimensional profile from the passive margin offshore Walvis Bay, Namibia. Model runs describe a 5-day wind-forcing event and a subsequent 20-day period of relaxation. As our work is also motivated by paleoceanographic questions, a lowered sea level geometry is used simulating Last Glacial Maximum (LGM) conditions. Results suggest the establishment of a long-lasting circulation comprising an offshore-directed surface layer and an onshore-directed bottom current. Shelf currents are vigorous but short-lasting, allowing transport of particles up to sand size. In contrast, transport at the upper slope is more persistent but restricted to smaller grain sizes. Sea level changes cause a shift of upwelling front in cross-shelf direction and of sedimentary deposition centers along the slope. Transport paths of surface source tracers show systematic variations, which can be evaluated in terms of grain-size fractionation as well as temporal and spatial clusters.

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An Experimental Investigation of the Brinkman Layer Thickness at a Fluid-Porous Interface

Cited by 15 publications

References 12 publications

A numerical investigation into the importance of bed permeability on determining flow structures over river dunes

A numerical investigation into the importance of bed permeability on determining flow structures over river dunes

A Proposed Particle Image Velocimetry (Piv) System For Instructional Purposes In A Modern Mechanical Engineering Undergraduate Laboratory Program

Modeling sediment transport patterns during an upwelling event

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