Hydrodynamic coefficients of yawed cylinders in open-channel flow

Persi, Elisabetta; Petaccia, Gabriella; Fenocchi, Andrea; Manenti, Sauro; Ghilardi, Paolo; Sibilla, Stefano

doi:10.1016/j.flowmeasinst.2019.01.006

Cited by 20 publications

(8 citation statements)

References 38 publications

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“…The model, applied both to flume and field experiments [23,24], implements a dynamic subroutine to compute wood transport in the hydrodynamic model ORSA2D, i.e., the same hydrodynamic module used as the basis for the Eulerian model presented in the previous paragraphs. The hydrodynamic forces are computed for each cylinder with proper hydrodynamic coefficients [42]. A two-way coupling, i.e., the effect of the wood on the water, is also implemented.…”

Section: Discussionmentioning

confidence: 99%

Modeling Large Wood Transport in Semi-Congested Regime with Multiple Entry Points

Persi

Meninno

Petaccia

et al. 2022

Water

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Wood transport during flood events can increase inundation risk and should be included in numerical models to estimate the associated residual risk. This paper presents the application of a fully Eulerian model that considers floating wood as a passive superficial pollutant through the adaptation of the advection–diffusion equation. A set of experiments is performed in a sinusoidal flume with a contraction to model semi-congested wood transport. The variation of the log release position replicates the possible variability of large wood entrainment during real events. The experiments are used to validate the numerical model, providing a comparison of the wood mass transport. Different release modes are also tested. The model predicts the position of the released logs and the overall transported mass, independently of the release position and modes, with an accuracy that varies along the flume length and across the flume axis. The analysis of the experimental and numerical transport velocity shows that modulation of the transport velocity is needed to ensure adequate model performances for semi-congested conditions.

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Section: Discussionmentioning

confidence: 99%

Modeling Large Wood Transport in Semi-Congested Regime with Multiple Entry Points

Persi

Meninno

Petaccia

et al. 2022

Water

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“…Similarly, Shields and Alonso () and Persi e t al . () also demonstrated experimental measurements of the drag and skin friction coefficients of a cylinder under different submergence and trunk angles. In contrast, Hygelund and Manga () indicated that the orientation of the trunk direction has no significant effect on the drag coefficient, whereas the depthwise position of the wood in the water influences the drag as the flow velocity can change depending on the water depth.…”

Section: Discussionmentioning

confidence: 99%

Numerical simulation of large wood deposition patterns and responses of bed morphology in a braided river using large wood dynamics model

Kang

Kimura

Shimizu

2020

Earth Surf Processes Landf

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This study discusses the reproducibility of a numerical model for simulating the morphodynamics involved in the transport of large pieces of wood in a braided river, considering the root wad effect and jam formation. The developed numerical model can simulate the behaviour of large pieces of wood using a two‐dimensional depth‐averaged Eulerian flow model that calculates the water flow and bed morphology. A Lagrange‐type wood transport model is used herein, and the applicability of the combined model is discussed through a comparison with obtained experimental results. From the simulation results, we calculate the total braiding index and estimate the deposition patterns of wood pieces for comparison with the experimental results. We then analyse the bed morphology responses and wood deposition patterns in terms of the root wad effect and input supply. Moreover, we discuss the advantages and limitations of the proposed model to predict the large wood dynamics considering the bed morphology. © 2019 John Wiley & Sons, Ltd.

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“…), the erosive action of the river stream must be reliably evaluated [34]. Several empirical formulas to predict final scouring are available, but the phenomenon is time-dependent and is affected by several uncertainties (related to both sediment and flow characteristics) as well as stochastic factors influencing the flow evolution such as transport and deposition of wood debris [5,35,36].…”

Section: Scouring and Sediment Transportmentioning

confidence: 99%

SPH Modeling of Water-Related Natural Hazards

Manenti

Wang

Domínguez

et al. 2019

Water

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This paper collects some recent smoothed particle hydrodynamic (SPH) applications in the field of natural hazards connected to rapidly varied flows of both water and dense granular mixtures including sediment erosion and bed load transport. The paper gathers together and outlines the basic aspects of some relevant works dealing with flooding on complex topography, sediment scouring, fast landslide dynamics, and induced surge wave. Additionally, the preliminary results of a new study regarding the post-failure dynamics of rainfall-induced shallow landslide are presented. The paper also shows the latest advances in the use of high performance computing (HPC) techniques to accelerate computational fluid dynamic (CFD) codes through the efficient use of current computational resources. This aspect is extremely important when simulating complex three-dimensional problems that require a high computational cost and are generally involved in the modeling of water-related natural hazards of practical interest. The paper provides an overview of some widespread SPH free open source software (FOSS) codes applied to multiphase problems of theoretical and practical interest in the field of hydraulic engineering. The paper aims to provide insight into the SPH modeling of some relevant physical aspects involved in water-related natural hazards (e.g., sediment erosion and non-Newtonian rheology). The future perspectives of SPH in this application field are finally pointed out.

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Hydrodynamic coefficients of yawed cylinders in open-channel flow

Cited by 20 publications

References 38 publications

Modeling Large Wood Transport in Semi-Congested Regime with Multiple Entry Points

Modeling Large Wood Transport in Semi-Congested Regime with Multiple Entry Points

Numerical simulation of large wood deposition patterns and responses of bed morphology in a braided river using large wood dynamics model

SPH Modeling of Water-Related Natural Hazards

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