Numerical and Experimental Investigation of Lung Bifurcation Flows

Corieri, Patricia; Benocci, C.; Paiva, Manuel; Riethmuller, M. L.

doi:10.1007/978-1-4757-1511-8_17

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…Such a one-to-many network may itself form a significant part of a larger intracranial network, however. Other related basic aspects of branching here are to be found in Pedley (1977Pedley ( , 1980, Snyder, Dantzker & Jaeger (1981) and Corieri et al (1991). Again, aspects of the work by Pedley and Pedley et al (1977) are incorporated in models for lung airways assuming symmetric branchings: see also the Weibel model, Wilquem & Degrez (1997), Comer et al (2001).…”

Section: Introductionmentioning

confidence: 97%

“…A wide scatter of branching-flow conditions is covered by theory and, especially recently, by direct numerical simulations. Simulations include those of Roach et al, Motimoya & Karino, Fisher & Fieman above, as well as Bramley & Dennis (1984), Gatlin et al (1995), Zhao, Brunskill & Lieber (1997), Corieri et al (1991), Lei, Kleinstreuer & Archie (1997), Comer, Kleinstreuer & Zhang (2001). In particular, Comer et al address three-dimensional steady laminar branching motion of incompressible fluid through two successive bifurcations in a rigid smooth tube.…”

Section: Introductionmentioning

confidence: 99%

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Direct simulations and modelling of basic three-dimensional bifurcating tube flows

Tadjfar¹,

Smith²

2004

J. Fluid Mech.

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Three-dimensional bifurcating internal flow is studied for a single mother tube branching into two equal but diverging daughter tubes. The mother tube is straight and of circular cross-section, containing a fully developed incident motion, while the diverging daughters are straight and of semi-circular cross-section. This basic configuration is treated first by direct numerical simulation and secondly by slenderflow modelling, for a variety of Reynolds numbers and angles of divergence. The direct simulations and modelling highlight different forms of three-dimensional separation or flow reversal as well as enhanced upstream and downstream influence and pressure loss induced by the bifurcations especially at increased divergence angles. Comparisons between the results from the simulations and those from the slender-flow modelling show relatively close agreement at medium values of Reynolds number. In particular, as the angle of divergence increases for a given Reynolds number, there is generally first an increase in flow attachment on to the inner divider wall(s) and then, at higher angles, an increasing trend to flow reversal at the corners formed by the junctions of the outer wall with the divider; longitudinal vortex motion is also enhanced then. The agreement persists over a surprisingly wide range of divergence angles.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Direct simulations and modelling of basic three-dimensional bifurcating tube flows

Tadjfar¹,

Smith²

2004

J. Fluid Mech.

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Numerical Modeling of Steady Inspiratory Airflow Through a Three-Generation Model of the Human Central Airways

Wilquem

Degrez

1997

Journal of Biomechanical Engineering

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Two-dimensional steady inspiratory airflow through a three-generation model of the human central airways is numerically investigated, with dimensions corresponding to those encountered in the fifth to seventh generations of the Weibel's model. Wall curvatures are added at the outer walls of the junctions for physiological purposes. Computations are carried out for Reynolds numbers in the mother branch ranging from 200 to 1200, which correspond to mouth air breathing at flow rates ranging from 0.27 to 1.63 liters per second. The difficulty of generating grids in a so complex configuration is overcome using a nonoverlapping multiblock technique. Simulations demonstrate the existence of separation regions whose number, location, and size strongly depend on the Reynolds number. Consequently, four different flow configurations are detected. Velocity profiles downstream of the bifurcations are shown to be highly skewed, thus leading to an important unbalance in the flow distribution between the medial and lateral branches of the model. These results confirm the observations of Snyder et al. and Tsuda et al. and suggest that a resistance model of flow partitioning based on Kirchhoff's laws is inadequate to simulate the flow behavior accurately within the airways. When plotted in a Moody diagram, airway resistance throughout the model is shown to fit with a linear relation of slope -0.61. This is qualitatively in good agreement with the experimental investigations of Pedley et al, and Slutsky et al.

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Numerical and Experimental Investigation of Lung Bifurcation Flows

Cited by 2 publications

References 2 publications

Direct simulations and modelling of basic three-dimensional bifurcating tube flows

Direct simulations and modelling of basic three-dimensional bifurcating tube flows

Numerical Modeling of Steady Inspiratory Airflow Through a Three-Generation Model of the Human Central Airways

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