Turbulence Flow Modeling of One-Sharp-Groyne Field

Herrera-Granados, Oscar

doi:10.1007/978-3-319-70914-7_12

Cited by 3 publications

(9 citation statements)

References 11 publications

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“…This decomposition is formally achieved by a filtering operation. The resolved part of the field represents the large eddies, while the subgrid part of the velocity represents the small scales whose effect on the resolved field is included through the SGS [13].…”

Section: Large Eddy Simulationmentioning

confidence: 99%

“…The Smagorinsky C s constant usually has the value 0.1-0.2. This is the mathematical framework within the Flow3D program [13].…”

Section: Large Eddy Simulationmentioning

confidence: 99%

“…The size of this nested mesh is 0.70 m (length) × 0.25 m (width) and 0.12 m (height). For the LES model, the filter width ∆ is taken to be proportional to the grid size; which should be chosen in such a way that the smallest resolved eddy of size ∆, can be reproduced accurately [13]. Thus, the size of the nested mesh cell is 0.001 m, based on the computations of the previously defined RANS model.…”

Section: Numerical Mesh and Boundary Conditionsmentioning

confidence: 99%

“…This study provided a better understanding of the flow physics and dynamics of the coherent structures of large-scale eddies and mechanisms responsible for sediment entrainment around the flow obstruction. Herrera-Granados [13] applied two 3D numerical techniques (RNG and LES) to compute the velocity field downstream of one single sharp groyne in a rectangular channel. This study demonstrated that LES is more appropriate for the computation of turbulence characteristics, but more expensive in terms of computational cost.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Flow Behavior in a Rectangular Channel with Submerged Weirs

Herrera-Granados

2021

Water

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In this contribution, different 3D numerical approaches are applied in order to simulate the behaviour of turbulent flow through a rectangular channel with broad-crested weirs. In addition, water flow velocities, using Acoustic Doppler Velocimetry (ADV) instrumentation, were recorded. Two turbulence quantities are estimated using the laboratory records and were compared with those computed with the Large Eddy Simulation (LES) and Reynolds Averaged Navier–Stokes (RANS) models. Additionally, a quadrant analysis of the laboratory records was carried out. The output of the models presents good agreement with the time-averaged parameters, but is not sufficient for the proper estimation of the turbulence quantities.

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Section: Large Eddy Simulationmentioning

confidence: 99%

“…The Smagorinsky C s constant usually has the value 0.1-0.2. This is the mathematical framework within the Flow3D program [13].…”

Section: Large Eddy Simulationmentioning

confidence: 99%

Section: Numerical Mesh and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Analysis of Flow Behavior in a Rectangular Channel with Submerged Weirs

Herrera-Granados

2021

Water

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“…Today, the most accurate, but also the most computation-intensive, turbulence modelling method used in practical engineering is the Large Eddy Simulation (LES). Due to the long computation time, this model is used rarely, mainly for small simulations (Lee et al 2008, Herrera-Granados 2018.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Fish Passage with Turning Pools

Maniecki

2018

Archives of Hydro-Engineering and Environmental Mechanics

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An assessment of operating conditions in a baffled fish passage with pool dimensions of 2.2 × 3.0 m, and 180° horizontally turning pools, was carried out using numerical computations and a site survey of water flow velocity distribution. Velocity was measured with a PMS electromagnetic flowmeter and a hydrometric current meter in representative cross-sections of the fish passage in the pool centres and in the baffle barrier cross-section area. Numerical computations were also performed for two alternative baffle locations in the fishway. One reflected the actual conditions, and the other was an alternative arrangement designed to improve hydraulic conditions for fish migration. The numerical model used the Large Eddy Simulation (LES) method, which makes it possible to detect large vortexes. The study pays close attention to the velocity field analysis as well as the distribution and sizes of vortexes in the turning pool of the culvert. The results of numerical computations and the site survey show high consistency, and the proposed baffle placement modification significantly improves flow conditions, especially in the entry section of the passage.

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Investigation of Flow Dynamics Around a Combination of Different Head Shapes of Spur Dikes

2022

Teh. vjesn.

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Spur dikes are widely used as river training structures throughout the globe to improve navigation, strengthen flood protection, and save erodible banks. This study investigates the flow behaviour of multiple spurs using similar and different head shapes instead of adding an extra structure. The novelty of the study lies in finding out the best combination of head shapes among circular (C), rectangular (R), and triangular (T) that can reduce the responsible factors of scouring and erosion. The responsible factors for scour and erosion include high magnitude velocity, pressure, turbulence kinetic energy (TKE), Reynold stresses, and wall shear stresses. Nine combinations (3 same, i.e., CCC, RRR, and TTT and six different, i.e., CRC, CTC, RCR, RTR, TCT, TRT) of spurs were investigated using Computational Fluid Dynamics (CFD) code FLUENT. Firstly, in the analysis of similar head shapes, more reduction in the values of scour and erosion responsible factors were observed in CCC combination (20% in velocity, 45% in pressure, 41% in TKE, and 43% in normal Reynold stresses). Finally, the reduction was further improved in analysing different head shapes. The CTC combination showed the most effective results in reducing the prescribed factors (43% in velocity, 57% in pressure, 51% in TKE, and 54% in normal Reynold stresses) compared to both combinations of head shapes. Therefore, to protect riverbank and spur head failure due to severe turbulent flow, the combination of spurs (CTC) could be preferred.

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Turbulence Flow Modeling of One-Sharp-Groyne Field

Cited by 3 publications

References 11 publications

Numerical Analysis of Flow Behavior in a Rectangular Channel with Submerged Weirs

Numerical Analysis of Flow Behavior in a Rectangular Channel with Submerged Weirs

Numerical Modelling of Fish Passage with Turning Pools

Investigation of Flow Dynamics Around a Combination of Different Head Shapes of Spur Dikes

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