A Meshless WCSPH Boundary Treatment for Open‐Channel Flow over Small‐Scale Rough Bed

Shen, Yang; Wei, Jiahua; Li, Shaowu; Song, Peng; Zhang, Bangwen

doi:10.1155/2019/1573049

Cited by 4 publications

(3 citation statements)

References 51 publications

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“…The numerical model was modified with a turbulent closure based on the mixing length approach, and a drag force term was added into the momentum equation to account for the rough boundary. In [35], an improved boundary treatment was proposed to characterize bed roughness based on the ghost boundary particles. Finally, [36] brought SPH to a level that can be applied to simulate turbulent open channel flows over and within natural porous gravel beds.…”

Section: Introductionmentioning

confidence: 99%

3-D Numerical Study of a Bottom Ramp Fish Passage Using Smoothed Particle Hydrodynamics

Novak

Domínguez

Tafuni

et al. 2021

Water

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Worldwide, the overwhelming number of man-made barriers in fluvial systems has been identified as one of the major causes of the reported staggering average declines of migratory fish. Fish passages have been shown to help mitigate such problems. Close-to-nature types of fish passages, such as bottom ramps, bypass channels, and fish ramps can be used to minimize the impact of artificial steep drops (e.g., weirs) on the migration of aquatic fauna, especially in cases of low-head barriers. This study focuses on the characterization of the flow pattern in a bottom ramp. A 3-D numerical model based on the meshless smoothed particle hydrodynamics (SPH) method was successfully validated and then employed for the simulation of turbulent free-surface flow in a straight channel with complex geometry. The effects of bed roughness, channel slope, and flow rate were quantified in terms of flow depth, velocity fields, and area‒velocity ratios. During the study, several new tools were developed, leading to new functionalities in pre-processing, solver, and post-processing which increase the applicability of DualSPHysics in the field of eco-hydraulics.

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Section: Introductionmentioning

confidence: 99%

3-D Numerical Study of a Bottom Ramp Fish Passage Using Smoothed Particle Hydrodynamics

Novak

Domínguez

Tafuni

et al. 2021

Water

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“…Numerical simulations of Poiseuille flow at low and moderate Reynolds numbers in straight channels and pipes using Smoothed Particle Hydrodynamics (SPH) have been performed by a number of authors [37,38,39,40,41,42]. In particular, simulations of open-channel flows have been primarily addressed to test the implementation of inlet, outlet and wall boundary conditions in SPH [43,44,45]. In comparison, SPH simulations of curved pipe flows are correspondingly scarcer.…”

Section: Introductionmentioning

confidence: 99%

SPH simulations of turbulent flow in curved pipes with different geometries. A comparison with experiments

Alvarado-Rodriguez,

Sigalotti,

Klapp

et al. 2021

Preprint

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The swirling secondary flow in curved pipes is studied in three-space dimensions using a weakly compressible Smoothed Particle Hydrodynamics (WCSPH) formulation coupled to new non-reflecting outflow boundary conditions. A large-eddy simulation (LES) model for turbulence is benchmarked with existing experimental data. After validation of the present model against experimental results for a 90 • pipe bend, a detailed numerical study aimed at reproducing experimental flow measurements for a wide range of Reynolds numbers has been performed for different pipe geometries, including U pipe bends, S-shaped pipes and helically coiled pipes.

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“…As a fully Lagrangian method that follows the collective motions of particles, inflow and outflow boundary conditions are difficult to imposed, in contrast to the Eulerian grid-based method [74,80]. In SPH, many authors have implemented the open boundary condition by introducing buffer zones at inflow and outflow boundaries [74,75,[80][81][82]. The buffer zones are where particles are introduced and removed from the computational domain [80].…”

Section: Open Boundarymentioning

confidence: 99%

A particle-based numerical method for modelling of fluid-structure interactions in biomanufacturing processes

Lee¹

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The study of human physiology and target medicine has made a great leap with the discovery of cell culture, an operation under the more general topic of biomanufacturing. One key biomanufacturing technique for the creation of in-vitro threedimensional tissue models and even diseases is the extrusion-based bioprinting, but the associated mechanical stresses can become so high that the cell viability significantly decreases. Therefore, methods that can characterize stresses induced in cell-laden bioinks during the printing process are critical to the advancement of bioprinting, ensuring high efficacy in the biomanufacturing technique. In this dissertation, a particle-based numerical method, commonly known as smoothed particle hydrodynamics (SPH), is developed to emulate the fluid-structure interactions between bioink and cells. To represent the cell deformations and motions, the SPH solver is coupled with an element bending group (EBG) model, which treats the cell as a solid membrane with liquid filling. The method is validated through comparison with experimental data on deformations and transport of a MCF7 cancerous cell through a microchannel. Upon validation, the method was applied on a model extrusion-based bioprinting configuration, considering in addition the use of cytoprotective gel particles to encapsulate the cells in the bioink, thereby maintaining a high cell viability. Using the deformations of the gel particles as boundary conditions, flow-induced stresses on the protective encapsulation can be computed by a separate finite element analysis. Stress analysis suggests the presence of a high stress region near the converging section before the bioprinter nozzle outlet, which is the likely cause of low cell viability in extrusion-based bioprinting. The results also indicate that the protective property from the encapsulating gel particles is due to the substitution of flow-induced stresses with internal stresses on the cells, which can be up to 90% less than the former. The findings from this research demonstrate that the two-dimensional SPH-EBG methodology developed here is a promising tool to predict stresses on cells within bioinks. Such a capability will not only facilitate the design of extrusion-based bioprinters, but also be applicable to other biomanufacturing techniques that involve cell-laden flows.

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A Meshless WCSPH Boundary Treatment for Open‐Channel Flow over Small‐Scale Rough Bed

Cited by 4 publications

References 51 publications

3-D Numerical Study of a Bottom Ramp Fish Passage Using Smoothed Particle Hydrodynamics

3-D Numerical Study of a Bottom Ramp Fish Passage Using Smoothed Particle Hydrodynamics

SPH simulations of turbulent flow in curved pipes with different geometries. A comparison with experiments

A particle-based numerical method for modelling of fluid-structure interactions in biomanufacturing processes

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