Numerical application of k-ɛ turbulence model to the flow over a backward-facing step

Ding, Daoyang; Wu, Shanshan

doi:10.1007/s11431-010-4099-9

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…Because the realizable k-e turbulent model can describe the boundary layer accurately, 15 this turbulent model is used for simulating the SAF flow field. The boundary condition of the simulation is that the inlet condition is the velocity inlet, and the outlet condition is the outflow.…”

Section: Simulation Model and Boundary Conditionmentioning

confidence: 99%

Research on the incidence of soft abrasive flow to a wall and the machining characteristics

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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In this study, a calculation model was proposed to predict the motion locus of particles moving to a wall in boundary layers. The velocity of soft abrasive flow and the incident angle of the particles were obtained based on the results calculated by the mixture model and realizable k–ε model. After the model formed, the distributions of the dynamic pressure and the volume fraction of abrasive particles were analyzed and compared to experimental results. After analysis, it was found that the amount of removed material is positively correlated with the incident velocity and the volume fraction of abrasive particles, as well as the dynamic pressure on the surface of the workpiece. In addition, the comparison shows that the numerical simulation method is feasible to predict the flow field and effect of soft abrasive flow. In addition, it was found that the simulation results are consistent with the flow field distribution and machining effect. Therefore, this model can be used in design of constrained modules.

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Section: Simulation Model and Boundary Conditionmentioning

confidence: 99%

Research on the incidence of soft abrasive flow to a wall and the machining characteristics

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…To show such a characteristic, CFD analyis was conducted using the same parameters as experiments in next section. The development of the CFD technology [16][17][18] permits us to observe the features of the pump, and further more, to verify the theoretical analysis. In this research, commercial CFD package Fluent 6.3 was employed to perform the computation.…”

Section: Simulation and Calculationmentioning

confidence: 99%

Theory and experimental verification of valveless piezoelectric pump with rotatable unsymmetrical slopes

Zhang

Xia

Huang³

et al. 2011

Sci. China Technol. Sci.

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A valveless piezoelectric pump with rotatable unsymmetrical slopes is developed in this research. It has the following features: The pump integrates driving and transporting, and it can mix different fluids while transporting them. In this paper, firstly, the design of the valveless piezoelectric pump with rotatable unsymmetrical slopes was proposed, and the single-direction flow principle was explained. Then, the fluid mechanics model of the valveless piezoelectric pump with rotatable unsymmetrical slopes was established. Meanwhile, the numerical simulation of the pump was performed. Finally, the experiments on relationship between the rotation angles of the slope and the flow rates were conducted. The experimental results showed that the maximum flow was 32.32 mL min 1 . The maximum relative error between the theoretical results and the experimental ones was 14.59%. For the relationship between rotation angles and flow ratio of two inlets, the relative error between the experimental and theoretical maxima was 3.75%. Thus, the experiments proved the feasibility of the pump design and verified the theory.piezoelectric, pump, valveless, rotatable, unsymmetrical slope Citation:Zhang J H, Xia Q X, Huang Y, et al. Theory and experimental verification of valveless piezoelectric pump with rotatable unsymmetrical slopes. Sci

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“…Sun et al [11] studied the aerator under gentle slope conditions and proposed the concept of "equivalent aerator height". Ding and Wu [12] analyzed the hydraulic characteristics over the backward-facing step with k- turbulence model. The results played an important role in protection of the cavitation damages to the bottom slab of discharge facilities.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic characteristics of converse curvature section and aerator in high-head and large discharge spillway tunnel

Liu

Zhang

et al. 2011

Sci. China Technol. Sci.

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The hydraulic characteristics and cavitation erosion near the converse curvature section in the high-head and large discharge spillway tunnel have been important issues of concern to the hydropower project. In this paper, the evolutions of hydraulic elements such as pressure, flow velocity, wall shear stress, etc. in the converse curvature section are analyzed and the impacts of bottom aerator on hydraulic characteristics are discussed, with the commercial software FLUENT6.3 as a platform and combining the k- model and VOF method. The flow pattern in the converse curvature section of spillway tunnel is given by the three-dimensional numerical simulation. It indicates that the pressure changes rapidly with great pressure gradient from the beginning to the end of the curve. It also shows that the shear stress on side wall just downstream the end of the converse curvature curve is still increasing; the aeration cavity formed downstream the bottom aerator may cause the side wall pressure decreased to worsen the cavitation characteristics near the side wall. By means of the physical model experiment, the three-dimensional aerator composed of side wall baffling aerator and bottom aerator is studied, the baffling aerator suitable for the water flow conditions with water depth of 6.0 to 8.0 m and flow velocity of 35 to 50 m/s is proposed. spillway tunnel, baffling aerator converse curvature section, hydraulic characteristics Citation: Liu Z P, Zhang D, Zhang H W, et al. Hydraulic characteristics of converse curvature section and aerator in high-head and large discharge spillway tunnel.

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Numerical application of k-ɛ turbulence model to the flow over a backward-facing step

Cited by 9 publications

References 4 publications

Research on the incidence of soft abrasive flow to a wall and the machining characteristics

Research on the incidence of soft abrasive flow to a wall and the machining characteristics

Theory and experimental verification of valveless piezoelectric pump with rotatable unsymmetrical slopes

Hydraulic characteristics of converse curvature section and aerator in high-head and large discharge spillway tunnel

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