Meshless particle modelling of free surface flow over spillways

Nodoushan, Ehsan Jafari; Hosseini, Khosrow; Shakibaeinia, Ahmad; Mousavi, Seyed Farhad

doi:10.2166/hydro.2015.096

Cited by 12 publications

(4 citation statements)

References 24 publications

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“…The governing flow equations are given by (Jafari-Nodoushan) including mass conservation and motion in the Lagrangian frame for a weakly compressible flow, [26]:…”

Section: Governing Equations and Computational Schemementioning

confidence: 99%

SPH Open Boundary Simulation of Free-Surface Flow Over Ogee-crested Spillway

Karim¹,

Mohammad²

2021

Tikrit j. eng. sci.

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This study was conducted to compare water surface profiles with standard ogeecrested spillways. Different methods were used, such as (experimental models, numerical models, and design nomographs for the United States Army Corps of Engineers, USACE). In accordance with the USACE specifications, three different models were constructed from rigid foam and then installed in a testing flume. The water surface profile has been recorded for these models with different design heads. For modeling the experimental model configurations, a numerical model based on the smoothed particle hydrodynamics (SPH) technique was used and is developed to simulate the water surface profile of the flow over the ogee-crested spillway. A 2D SPHysics open-source software has been used in this study, using the SPH formulation to model fluid flow, developing the SPH boundary procedure to handle open-boundary simulations, and modifying the open-source SPHysics code for this purpose. The maximum absolute difference between the measured and computed results of the water surface profile for all head ratios of (H/Hd), does not exceed 4.63% at the crest region, the numerical results for the water surface profile showed good agreement with the physical model results. The results obtained experimentally and numerically by SPH are compared with the CFD results in order to be more reassuring from the results. Additional comparisons were made using interpolated data from USACE, Waterways Experiment Station (WES), and design nomographs. The SPH technique is considered very promising and effective for free surface flow applications.

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“…The governing flow equations are given by (Jafari-Nodoushan) including mass conservation and motion in the Lagrangian frame for a weakly compressible flow, [26]:…”

Section: Governing Equations and Computational Schemementioning

confidence: 99%

SPH Open Boundary Simulation of Free-Surface Flow Over Ogee-crested Spillway

Karim¹,

Mohammad²

2021

Tikrit j. eng. sci.

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“…Most data available in the literature has focused on heads near the design head and has shown that generally, discharge coefficients increased with increasing head ratio (Corps of Engineering, 1977;Erpicum et al, 2018;Jafari-Nodoushan et al, 2016;Kim & Park, 2005).…”

Section: Discharge Coefficientmentioning

confidence: 99%

“…Kanyabujinja (2015) used a two-phase CFD package Ansys-Fluent with realizable k-eddy viscosity closure and modeled flow domain of a typical ogee spillway, in two and three dimensions. A 2DV meshless Lagrangian model based on weakly compressible Moving particle Semi-implicit (MPS) method was developed by Jafari-Nodoushan, Hosseini, Shakibaeinia, and Mousavi (2016) to simulate pressure and velocity over ogee crest spillways. In a recent study, Fleit, Baranya, and Bihs (2018) introduced a numerical model, REEF3D, to predict water level and flow domain on an ogee type weir for both conditions of free surface and submerged flow.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of flow over ogee crested spillways under high hydraulic head ratio

Imanian

Mohammadian

2019

Engineering Applications of Computational Fluid Mechanics

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Ogee spillway is one of the most common types of the spillway. Researchers have attempted to investigate the hydraulics of ogee structure under hydraulic heads near the design head. Herein, an ogee-crested spillway is studied at heads significantly greater than the design head. The efforts are undertaken to study the hydrodynamic field under high head ratio conditions by conducting a numerical simulation using OpenFOAM with five turbulence closures including standard k-, realizable k-, RNG k-, k-ω SST and LRR. The comparisons of flow parameters under different head ratios with the experimental data demonstrated that the LRR model had the best performance, which shows its strength in cases dealing with flow separation or significant streamline curvature. It is found that with increasing hydraulic head, up to seven times that of the design head, the flow separation zone grows linearly. Discharge coefficients are studied for a wide range of head ratios. It is concluded that increasing head ratio up to five leads to an increase in the discharge coefficient due to decreasing pressure on the ogee crest. As head ratio increases to greater values, the discharge coefficient drops suddenly due to some changes in the pressure field.

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“…The WC-MPS method, compared to the standard MPS method, requires less computer memory and potentially can speed-up the simulations. The WC-MPS method is validated through the simulation of several free-surface problems including flow over spillways [30] and flow over the sills and in trenches [28].…”

Section: Introductionmentioning

confidence: 99%

MR-WC-MPS: A Multi-Resolution WC-MPS Method for Simulation of Free-Surface Flows

Nabian

Farhadi

2019

Water

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A Multi-Resolution Weakly Compressible Moving-Particle Semi-Implicit (MR-WC-MPS) method is presented in this paper for simulation of free-surface flows. To reduce the computational costs, as with the multi-grid schemes used in mesh-based methods, there is also a need in particle methods to efficiently capture the characteristics of different flow regions with different levels of complexity in different spatial resolutions. The proposed MR-WC-MPS method allows the use of particles with different sizes in a computational domain, analogous to multi-resolution grid in grid-based methods. To evaluate the accuracy and efficiency of the proposed method, it is applied to the dam-break and submarine landslide tests. It is shown that the MR-WC-MPS results, while about 15% faster, are in good agreement with the conventional single-resolution MPS results and experimental results. The remarkable ability of the MR-WC-MPS method in providing robust savings in computational time for up to 60% is then shown by applying the method for simulation of extended submarine landslide test.

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Meshless particle modelling of free surface flow over spillways

Cited by 12 publications

References 24 publications

SPH Open Boundary Simulation of Free-Surface Flow Over Ogee-crested Spillway

SPH Open Boundary Simulation of Free-Surface Flow Over Ogee-crested Spillway

Numerical simulation of flow over ogee crested spillways under high hydraulic head ratio

MR-WC-MPS: A Multi-Resolution WC-MPS Method for Simulation of Free-Surface Flows

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