Search results

Simulation results show that, water fluctuation and energy dissipation of round-flow emitter in vibration mode are better than that of constant pressure.
Application of CFD (Computer Fluid Dynamics) software FLUENT to study the relationship between flux and pressure under vibration pressure,using user-defined functions UDF to realize the boundary condition of vibration pressure, which can provide reference and basis for the selection of vibration parameters.
It is an assumption that there is no interaction between the variable factors.We design anorthogonal test table that each vibration mode consistsof 9 groups simulation program, as shown in Table 1.
Flow Field Numerical Simulation.3D model of the round-flow emitter is designed by means of Pro/E.
Fig.3:Outlet flow value of round-flow emitter under the sine vibration mode 1 simulation program.

Several works on numerical simulation of thermal performance of single tower [2, 3, 4, 5, and 6] are reported in the literatures.
Zhai and Fu [7] used both wind tunnel experiment and CFD simulation approaches to investigate the performance of windbreak methods for two cooling towers in-tandem arrangement under windy conditions.
The aim of this study is to investigate, using a general-purpose CFD code, the effect of different crosswind velocities and directions on the thermal performance of three aligned NDDCT utilizing the standard k–ε turbulence model.
For grid study of the present simulation, three sets of grids were used and considering the results with maximum difference of one percent in the heat transfer, the case with 2,543,200 cells was selected for three aligned towers at the final simulation.
Behnia: The Performance of Natural Draft Dry Cooling Towers Under Crosswind: CFD study, Int.

Three-dimensional numerical simulations have been carried out for a steady and turbulent flow.
Shu et al. [6] have developed a method to obtain the thermal characteristics of the double skin façade system using computational fluid dynamics (CFD) techniques, and evaluated the energy performance of the DSF system.
The numerical simulations were carried out for a three-dimensional, steady and turbulent flow.
Numerical simulations were performed with ANSYS Fluent® CFD commercial software.
For all simulations performed in this study, converged solutions were achieved with residuals as low as 10-5 (or less) for all the governing equations.

Numerical Simulation of the Viscous Flow for the Supersonic Jet Element Yong Xu1, a, Guoqing Zhang1, b and Fei Wang2,c 1School of Aerospace Engineering, Beijing Institute of Technology, Beijing, 100081, China 2 School of Mechanical & Electronic Engineering, Beijing Institute of Technology, Beijing, 100081, China axyxuyong@bit.edu.cn, bzhangguoqing@bit.edu.cn, cwfphd@126.com Keywords: Supersonic Jet Element; Numerical Simulation; Viscous Flow; Switching Time.
The viscous flow of the supersonic jet element was simulated numerically based on CFD technology, and many tests have been done to verify the numerical precision.
So the numerical simulation of the viscous flow for the supersonic jet element is accurate and reliable, and it can be applied to investigate the steady flow and unsteady flow in supersonic jet element.
Numerical Simulation Method Fig.2 The solid scheme of the SJE Fig.3 The surface grids of the SJE Fig.2 has shown the solid scheme of the SJE, and Fig.3 has shown the surface girds of the SJE.
So the numerical simulation of the viscous flow for the supersonic jet element is accurate and reliable, and it can be applied to investigate the steady flow and unsteady flow in supersonic jet element.

As recent studies, fluid flow characteristics in the diffuser-type shrouds of power generation system which is operated by river flow were analyzed, and the turbine efficiency was predicted with the momentum source factors through CFD [1, 2].
Therefore, in this study, flow field characteristics for seawater in various tidal current directions are investigated with numerical simulation which presents the angular velocity and drag force of turbine system. 1.
Numerical modeling In this study, commercial CFD code (Fluent 6.3) is used for the numerical analysis.
Conclusion In this study, numerical analysis by CFD has been performed to investigate seawater flow characteristics and drag force changes in tidal current turbine system with the variation of current direction.
Song, Fundamental study on the HAT(Horizontal Axis Turbine) tidal current power rotor performance by CFD, The Korean Society for New and Renewable Energy. 5 (2009) 3-7.

CFD software was used to simulate the water-oil falling film on the plate.The simulation results show that using a inclined plate within the reactor can expand the contact area between water and oil effectively.
(1) (2) Mathematical model and numerical simulation method Geometric model.
The research about flow of two immiscible liquids was mainly concentrated in the dispersed phase droplet formation mechanism aspects[5],while this paper considered more about the simulation analysis of oil droplet coalescence on the inclined plate.
The numerical simulation result shows that VOF model can well simulate the inclined plate falling film flow. 3.
Numerical simulation of wavy falling film flow using VOF method[J].

Finally, steady flow simulations are performed using the CFD solver Fluent.
Introduction Blood flow simulations are helpful in understanding certain phenomena, such as the perfusion of the cardiac pump.
Once adequately meshed, blood flow simulations have been carried out.
Figure.1 Geometrical model and mesh Figure.2 Domain mesh with references Simulation The flow in our model was computed using the software Fluent.

The BEM theory, the wind tunnel experiment, the field experiment and the CFD simulation are the major methods to study wind turbine[2,3].
Among these methods, CFD simulations can provide valuable quantitative insight into the aerodynamic behavior in a cheap and efficient way, and have been more and more extensively applied to investigate flows aroud wind turbine . .
Large-eddy simulation (LES) was developed as an intermediate approach between direct numerical simulation (DNS) in which the Navier-Stokes equations are directly solved and RANS.
LES Simulation Mathematical Model.
In our simulations is set 0.1.

This paper is based on the method of volume of fluid function (VOF) and founds numerical wave tank similar to real sea condition using business software CFD and its function of second development, proceeds numerical simulation of linear wave and second-order stokes and compares them with the theoretical value.
In this way, we could realize the accurate simulation of the waves [8].
Graph 1 The size of the three-dimensional Numerical Water Tank(NWT) Results: Simulation of Linear Wave.
After Fluent simulation, visibility processing of the results is performed with the aid of data-analyzing software Tecplot.
Graph 4 Wave surface variation where x=50m It can be observed from graph 4 that the simulation of second-order stokes wave is very close to theoretical value and simulation result of linear wave.

Applying commercial CFD software FLUENT, the cavitation issuing from the orifice was numerically investigated, reducing the harm.
Because of complicated flow field and high-cost experiment, it is important to predict cavitation erosion by numerical technology such as CFD.
In addition, the effect of surface tension weaker than viscosity, compared from the Fig. 3 and Fig. 2. ——0.1 ------0.5 …….0.8 Fig.3 Time evolution of the bubble radius R(t) in liquids of different surface tension. 3.3 effect of temperature on cavitation bubbles The numerical simulations of radius evolution, R, versus t are shown in Fig. 4, which are obtained from Equation (7).
Meehanical Engineering Science.2009,223(C10):2297-2307 [2] Liu Xiaohong,Ke Jian.Noise Appraisement of Hydraulic Poppet Valve Based on CFD Analysis[J].
Three-dimensional CFD study of liquid-solid flow behaviors in tubular loop polymerization reactors：The effect of guide vane［J］.