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Simulation of 3-D Unsteady Flows in a Tubular Hydro-Turbine on DES Zhenyu OUYANG 1, a, Lixiang ZHANG 2, b 1,2 Faculty of Civil Engineering, Kunming University of Science and Technology, Kunming, 650500,China a15912402706@163.com, bzlxzcc@126.com Keywords: Tubular Hydro-Turbine; computational fluid dynamics (CFD); 3D unsteady turbulences; detached eddy simulation(DES); numerical simulation Abstract.
The vortex model is picked with detached eddy simulation for the unsteady turbulent field calculations, in order to obtain the transient characteristics of the turbine turbulent flow.
Due to the higher efficiency of the method of calculation of RANS, it is widely used in practical engineering , but its drawback is that the rotation effect on the turbulent flow is difficult to reflect; Large Eddy Simulation CFD method is currently a hot research and application[3-4], and for the rotation of the turbulence it has better adaptability but also occupies a larger computing resources; DES method is integrated with the advantages of both, and with a better application[5].
Nanoparticle Transportation and Brownian Diffusion in Planar Jet Flow via Large Eddy Simulation [J].
Francis turbine fine three- dimensional unsteady flow separation eddy simulation model [J].

An example of the CFD simulation results on the pressure and velocity distributions of a propeller is shown in Fig. 3.
Implementation Model of Trajectory-Tracking Controller for a Quadrotor UAV Implementing the Simulation Model.
This model is based on the CFD simulation, the specialization of HA’s features and microcontrollers in order to accurately analyze, design, implement and realize the control parts of system.
[15] OpenModelica, Simulation software, https://www.openmodelica.org/ (2012)
[16] Fritzson P., Introduction to Modeling and Simulation of Technical and Physical Systems with Modelica, John Wiley & Sons (2011)

Often this is done virtually by applying simulations.
CAD model for CFD analysis.
In order to study the effects of the building’s facade redesign on its wind environment the state-of-the-art tool which allows combining quick building modeling with advanced computational fluid dynamic (CFD) simulation has been employed.
Applied CFD interface has been designed to run the simulations with simplified settings where geometry and boundary conditions are upper-set.
Grid independence analysis has been fulfilled by comparison of the CFD simulation results of two different grid spacing values – 2 (for the rest of the calculations) and 3 meters.

With the rapidly development of computational fluid dynamics (CFD) technology, CFD simulation has become an important method to solve practical engineering problems.
CFD Simulation Model of two-phase.
The theoretical and CFD simulation results are generally consistent with test data, pressure drop is increased with the flow.
However, the larger deviations between theoretical values and test data occur at higher oil-water ratio, but the CFD results are still reliable.
(a). oil-water ratio: 0/100 (b). oil-water ratio: 20/80 (c). oil-water ratio: 60/40 (d). oil-water ratio: 100/0 Fig. 7 Comparison of ΔP values between test, theory and simulation Conclusions This paper investigates an oil-water phase model in downhole Venturi meter through the theoretical calculation, CFD simulation, and experimental test.

According to the actual operating parameters of tundish in a steel mill, the flow pattern and temperature distribution of molten steel in tundish were studied by CFD and heat transfer calculation method.
Using CFD and heat transfer calculation method, the effect of parapet hole height on molten steel flow and temperature distribution were studied.
Chen, et al.: Physical simulation on gas curtain of single flow tundish, Refractories & Line. 38(5) (2013) 11-17
Duan: The numerical simulation of continuous casting tundish inclusions behavior, World Iron & Steel. (4) (2014) 21-26
Lei, et al.: Numerical simulation on tundish induction heating, Research on iron & steel. 42(3) (2014) 20-25

This paper simulated airflow field surrounding the iced conductor by using CFD software and discussed aerodynamic characteristics of iced conductor.
This is further analyzed through numerical simulation in the following text.
Table.1 shows similar overall trend of aerodynamic coefficient gained from CFD simulation with that of wind tunnel test results.
[2] Yanfang Zhai: Overhead transmission conductor simulation and interphase interval research[D].
[8] Pengfei Li, Minyi Xu, Feifei Wang:FLUENT GAMBIT ICEM CFD Tec plot.( Posts and Telecom Press, Beijing,2011),p267

Research progress about experimental method and simulation computation of workability of pumping concrete are presented, which would provide research thinking and research method for combining simulation computation and experimental method.
This method bases on computational fluid dynamics (CFD), which combines Bingham constitutive model; (2) discrete particle flow method.
Fig.4 shows simulation results of slump test through VSEM[5].
Many commercial CFD softwares support this method.
Research of pumping concrete and small scale simulation computation Conclusions This paper introduces research progress of workability theoretical research and simulation computation of pumping concrete.

Keywords:homogenizing valve; homogenization; numerical simulation; computational fluid dynamics Abstract.
Numerical investigations on flow and pressure fields within a kind of new type homogenizing valve have been conducted using computational fluid dynamics (CFD) software.
The study indicates that the new type homogenizing valve can be modeled by CFD and detailed information on high speed flow is available.
To obtain estimates of such data, numerical simulations are required.
Visualization of the flow patterns in a high-pressure homogenising valve using a CFD package.

The effect of added plates on the pressure field of the near wake of the model and mechanism are analyzed by CFD method.
CFD Procedures.In the CFD simulations, software Fluent 6.2 and the RNG k-ε turbulence models were applied to improve the accuracy of simulations.
The steady state CFD simulations indicate that addition of the flat plates reduces the drag about 5~8%.
Conclusions Based on the CFD simulations and above analysis, the following conclusions can be drawn: (1) Numerical simulation and theoretical analysis explicitly the characteristics of external flow field for the simple van body truck model.
(2) The steady state CFD simulations indicate that addition of the flat plates reduces the drag about 5~8%.

The effects of Reynolds number, volume concentration of suspended nanoparticles on the heat transfer characteristics were investigated using CFD software.
Simulation: The shell and tube heat exchanger being utilized in this experiment consists of a shell with an internal diameter of 0.146m and tubes of internal and external diameters 0.01m and 0.0133m respectively.
The grid used for the simulation is an unstructured mesh (hexagonal and tetrahedral elements).
A commercial CFD code (Ansys Fluent 13.0), is employed to study effect of nanofluid on convective heat transfer coefficient by simulating the shell and tube heat exchanger.
Water and Al2O3/water nanofluid were used as working fluid for the simulation.