Incompressible SPH simulation of open channel flow over smooth bed

Tan, Soon Keat; Cheng, Nian‐Sheng; Xie, Yin; Shao, Songdong

doi:10.1016/j.jher.2014.12.006

Cited by 18 publications

(9 citation statements)

References 21 publications

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“…Two uniform laminar flow test cases of open channels [18] were simulated. The length of the numerical channel was 1.0 m. The slope was 0.04% for case 1 and 0.1% for case 2.…”

Section: Open Channel Flowmentioning

confidence: 99%

Numerical Simulations of 2D Hydraulic Jumps by a Parallel SPH Model

Lin

Mao

Ding

et al. 2021

Water

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Hydraulic jumps are a rapid transition from supercritical to subcritical flow and generally occur in rivers or spillways. Owing to the high energy dissipation rate, hydraulic jumps are widely applied as energy dissipators in hydraulic projects. To achieve efficient and accurate simulations of 2D hydraulic jumps in open channels, a parallel Weakly Compressible Smoothed Particle Hydrodynamics model (WCSPH) with Shepard Density filter was established in this study. The acceleration of the model was obtained by OpenMP to reduce execution time. To further reduce execution time, a suitable and efficient scheduling strategy was selected for the parallel numerical model by comparing parallel speed-ups under different scheduling strategies in OpenMP. Following this, two test cases of uniform flow in open channels and hydraulic jumps with different inflow conditions were investigated to validate the model. The comparison of the water depth and velocity fields between the numerical results and the analytical solution generally showed good agreement, although there was a minor discrepancy in conjugate water depths. The numerical results showed free surface undulation with decreasing amplitude, which is more consistent with physical reality, with a low inflow Froude number. Simultaneously, the Shepard filter was able to smooth the pressure fields of the hydraulic jumps with a high inflow Froude number. Moreover, the parallel speed-up was generally able to reach theoretical maximum acceleration by analyzing the performance of the model according to different particle numbers.

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“…Two uniform laminar flow test cases of open channels [18] were simulated. The length of the numerical channel was 1.0 m. The slope was 0.04% for case 1 and 0.1% for case 2.…”

Section: Open Channel Flowmentioning

confidence: 99%

Numerical Simulations of 2D Hydraulic Jumps by a Parallel SPH Model

Lin

Mao

Ding

et al. 2021

Water

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“…Meister et al [2014] performed the same numerical technique and the analytical solution of the main velocity and the corresponding pressure distribution were initially imposed. Moreover, Tan et al [2015] performed an incompressible SPH (ISPH) technique to simulate open channel turbulent°ows over a smooth bed. The comparisons indicated that the velocity trend in the upper region is quite promising, but the error becomes larger near the channel bed as the°ow depth becomes shallower.…”

Section: Literature Review On Sph Applications In Open Channel Flowsmentioning

confidence: 99%

“…The comparisons indicated that the velocity trend in the upper region is quite promising, but the error becomes larger near the channel bed as the°ow depth becomes shallower. Kazemi et al [2017] used similar techniques of Fedderico et al [2012] and Tan et al [2015], but with the di®erence that the in°ow particle velocities are linked with those of the inner°uid particles, so that the°ow is evolved naturally without any prescription of the in°ow velocity.…”

Section: Literature Review On Sph Applications In Open Channel Flowsmentioning

confidence: 99%

3D SPH Simulation of Dynamic Water Surface and Its Interaction with Underlying Flow Structure for Turbulent Open Channel Flows Over Rough Beds

Gabreil

Tait

Nichols

et al. 2018

International Journal of Ocean and Coastal Engineering

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In this study, a fully 3D numerical model based on the Smoothed Particle Hydrodynamics (SPH) approach has been developed to simulate turbulent open channel flows over a fixed rough bed. The model focuses on the study of dynamic free surface behavior as well as its interaction with underlying flow structures near the rough bed. The model is improved from the open source code SPHysics ( http://www.sphysics.org ) by adding more advanced turbulence and rough bed treatment schemes. A modified sub-particle-scale (SPS) eddy viscosity model is proposed to reflect the turbulence transfer mechanisms and a modified drag force equation is included into the momentum equations to account for the existence of roughness elements on the bed as well as on the sidewalls. The computed results of various free surface patterns have been compared with the laboratory measurements of the fluctuating water surface elevations in the streamwise and spanwise directions of a rectangular open-channel flow under a range of flow conditions. The comparison has demonstrated that the proposed 3D SPH model can simulate well the complex free surface flows over a fixed rough bed.

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“…Recently, some pioneering works have been carried out on the treatment of inflow/outflow boundary conditions in SPH, for example, Federico et al , Aristodemo et al and Tan et al . In present study, a similar technique has been adopted but with the difference in that the inflow particle velocities are linked with those of the inner fluid particles, so that the flows are evolved naturally without any prescription of the inflow velocity.…”

Section: Numerical Modelling Schemementioning

confidence: 99%

SPH modelling of depth‐limited turbulent open channel flows over rough boundaries

Kazemi

Nichols

Tait

et al. 2016

Numerical Methods in Fluids

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SUMMARYA numerical model based on the smoothed particle hydrodynamics method is developed to simulate depth-limited turbulent open channel flows over hydraulically rough beds. The 2D Lagrangian form of the Navier-Stokes equations is solved, in which a drag-based formulation is used based on an effective roughness zone near the bed to account for the roughness effect of bed spheres and an improved sub-particle-scale model is applied to account for the effect of turbulence. The sub-particle-scale model is constructed based on the mixing-length assumption rather than the standard Smagorinsky approach to compute the eddy-viscosity. A robust in/out-flow boundary technique is also proposed to achieve stable uniform flow conditions at the inlet and outlet boundaries where the flow characteristics are unknown. The model is applied to simulate uniform open channel flows over a rough bed composed of regular spheres and validated by experimental velocity data. To investigate the influence of the bed roughness on different flow conditions, data from 12 experimental tests with different bed slopes and uniform water depths are simulated, and a good agreement has been observed between the model and experimental results of the streamwise velocity and turbulent shear stress. This shows that both the roughness effect and flow turbulence should be addressed in order to simulate the correct mechanisms of turbulent flow over a rough bed boundary and that the presented smoothed particle hydrodynamics model accomplishes this successfully.

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Incompressible SPH simulation of open channel flow over smooth bed

Cited by 18 publications

References 21 publications

Numerical Simulations of 2D Hydraulic Jumps by a Parallel SPH Model

Numerical Simulations of 2D Hydraulic Jumps by a Parallel SPH Model

3D SPH Simulation of Dynamic Water Surface and Its Interaction with Underlying Flow Structure for Turbulent Open Channel Flows Over Rough Beds

SPH modelling of depth‐limited turbulent open channel flows over rough boundaries

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