Direct Numerical Simulation of Turbulent Open Channel Flow: Streamwise Turbulence Intensity Scaling and Its Relation to Large-Scale Coherent Motions

Bauer, C.; Sakai, Y.; Uhlmann, M.

doi:10.1007/978-3-031-55924-2_42

Springer Proceedings in Physics

2024

DOI: 10.1007/978-3-031-55924-2_42

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Direct Numerical Simulation of Turbulent Open Channel Flow: Streamwise Turbulence Intensity Scaling and Its Relation to Large-Scale Coherent Motions

C. Bauer,

Y. Sakai,

M. Uhlmann

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2024

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Cited by 1 publication

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Turbulent flow over random sphere packs – an investigation by pore-resolved direct numerical simulation

v.Wenczowski,

Manhart

2024

J. Fluid Mech.

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Pore-resolved direct numerical simulations have been performed to investigate the turbulent open-channel flow over a rough and permeable sediment bed, represented by a mono-disperse random sphere pack. After a careful validation, eleven cases were simulated to systemically sample a parameter space spanned by a friction Reynolds number $Re_\tau \in [150, 500]$ and a permeability Reynolds number $Re_K \in [0, 2.8]$ . By varying the ratio of flow depth to sphere diameter within a range of $h/D \in \{ 3,5,10,\infty \}$ , the influence of both Reynolds numbers on the flow field and the turbulence structure could be investigated independently. The simulation results are analysed within a time–space double-averaging framework, whereas flow visualizations provide insight into instantaneous fields. Based on the drag distribution, we propose a consistent interface description, which can be used to define both near-interface and outer-flow coordinates. In these near-interface coordinates, the profiles of the mean velocity and the total shear stress collapse. Furthermore, the proposed interface definition yields outer-layer coordinates, in which the flow and turbulence statistics over a rough and permeable bed reveal similarity to a smooth-wall flow at a similar $Re_\tau$ . Within the parameter space, $Re_\tau$ has a strong influence on the wake region of the velocity profile. In contrast, $Re_K$ changes the wall-blocking effect and the shear intensity, which is reflected by the turbulence structure and vortex orientation in the near-interface region. As streamwise velocity streaks disappear and the vortex inclination increases with higher $Re_K$ , differences between near-interface and outer-layer turbulence structure are reduced.

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Turbulent flow over random sphere packs – an investigation by pore-resolved direct numerical simulation

v.Wenczowski,

Manhart

2024

J. Fluid Mech.

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Direct Numerical Simulation of Turbulent Open Channel Flow: Streamwise Turbulence Intensity Scaling and Its Relation to Large-Scale Coherent Motions

Cited by 1 publication

References 15 publications

Turbulent flow over random sphere packs – an investigation by pore-resolved direct numerical simulation

Turbulent flow over random sphere packs – an investigation by pore-resolved direct numerical simulation

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