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CFD-Based Visualization Research on the Rotation of Hydraulic Slide Valve Spool YUAN Bin1,a, JIANG Zhu2,b 1State key Laboratory of Astronautic Dynamics, Xi’an 710043, China 2School of Energy and Environment, Xihua University, Chengdu 610039, China a397470723@qq.com, bhill5525@163.com Keywords: Hydraulic slide valve; Spool; Rotation; CFD Abstract.
Geometric Model of the Slide Valve The numerical simulation of three-dimensional turbulent flow in the hydraulic slide valve must be established on the basis of physical model and calculation model [4].
Mesh Generation and Calculation 3.1 Mesh Generation The three-dimensional CFD slide valve model is established and meshes are generated in the fluid analysis software.
The total torque on the spool axis can be obtained through CFD numerical calculation, as shown in figure 5.
Research on numerical simulation method of three dimensional turbulent flow field based on SIMPLE algorithm [D].

However, uncertainties within CFD simulations are rarely documented and difficult to quantify.
The CFD simulation used the k-ϵ{TTP}1013 turbulence model, and the injected flow was taken to be 40 degrees warmer than the bulk flow, such that flow temperature in the simulation is an analogue for activity the scanner would have detected.
This comparison further illustrates how the 3-D PET data fields can facilitate quantification of CFD simulation outcome validity.
The CFD simulations presented here are not optimized for fidelity to the flow around the rod bundle, and are only offered to illustrate the approach used to compare of PET data to CFD outcomes.
It is a promising validation technique that can use 2D, 3D, and dynamic PET data to validate CFD simulations.

Griffithsb School of Metallurgy and Materials, University of Birmingham, UK B15 2TT adjb988@bham.ac.uk, bw.d.griffiths@bham.ac.uk Keywords: Simulation, Inclusions, CFD, DEM Abstract.
The computer simulation was created by a combination of Computational Fluid Dynamics (CFD) and Discrete Element Modelling (DEM), to try to predict the agglomeration characteristics of inclusions in liquid Al alloy in a launder system.
A combined CFD/DEM (Discrete Element Modelling) approach has been used to study fluidized bed behaviour [6].
With collisions turned on the simulation was around ten times slower with 0.382 seconds of simulation in the same time period.
Guo, A Coupled DEM/CFD Analysis of die filling process, Thesis, Birmingham University, 2010

About 2750 iterations were used for the simulation purpose.
Simulation and discussion Creating the model: Pre-processing stage Table 1 Vehicle segmentation.
Energy equation is used for the simulation because the flow is compressible and also idea gas equation is used.
Setting and , the simulation is proceeded with a maximum number of iterations 5000.
Then the simulation will stop.

CFD Simulation on the Phase Change Storage Energy Materials Lin Qiu, Min Yan, Song Lu Beijing University of Civil Engineering and Architecture, Beijing, China qiulin@bucea.edu.cn, hsym214@sina.com, hotdogls321@163.com Keywords: CFD, phase change materials, storage energy, numerical simulation.
This paper studied a phase change process of phase change material (PCM) application building energy storage by CFD software.
Model Establishment The study for simulation of storage and generate heat when phase change materials in the test tube.
Simulation of working conditions can be seen in table 1, thermal properties of the phase change materials as shown in table 2.
[4] Marilena,Giangi.Phase change problems with free convection: fixed grid numerical simulation.

In order to solve the heat dissipation problem of LED (light-emitting diode) downlight, CFD thermal simulation software was used to establish LED downlight dissipation model.
Section I is about heat dissipation modeling, and Section II is lab measurement and CFD heat simulation analysis, and then Section III is light source layout optimization.
Through experiments, we found that the CFD thermal simulation analysis results were not much difference, as shown in figure 4(a) and 4(b).
CFD Simulation. 25W 8 inch LED downlight used 60 pits medium power 5630 LED array light source, materials and heat conductivity value are shown in table.2.
Figure8.CFD simulation results Results analysis.

The methodology employed in achieving this investigation involved: Acquisition of experimental data, CFD modelling and simulation of various flow scenarios to investigate multiphase flow behaviour.
Solver parameters and stopping criteria was specified and the simulation was run.
Figure 13: Pressure gradient plot for experimental and CFD results in upward-inclined pipe It was clearly observed that the pressure gradients from CFD simulations were smaller than those recorded in experiments from literature for corresponding superficial gas and liquid velocities.
Liquid hold-up investigation from the CFD simulations revealed the effects of inclination and superficial liquid and gas velocities on values obtained.
Horizontal well performance flow simulation cfd-application.

The results of CFD agree well with experimental data.
Basic Theory The numerical simulations are based on RANS equations closed by realizable k-ε model.
Validation of CFD Method Geometric Model.
Simulation with no propeller was firstly conducted in both 3-cycle and 4-cycle inflow, and nominal velocity distribution were gotten at propeller plane.
The corrected results of CFD show that CFD has enough accuracy for predicting unsteady propeller forces.

According to the method, new energy-saving burner system framework is analyzed, fuel combustion calculation, key institutions check and CFD simulation are combined in the technical route of burner structure design.
The two results above show that burner in this paper can satisfy burning abundantly requirement, thus, the structure design of burner is relatively reasonable in combustion calculation and check way. 4 Simulation and optimization of burner critical component In this paper, CFD simulation technology is adopted to simulate actual burning environment, and the simulation results is used to conduct structure optimization of burner.
Figure 4: Annular nozzle institution speed field simulation results Figure 5: New energy-saving buner system Take fuel burning calculation, burner structure design, burning check of key parameters, components of the burner and key mechanism CFD simulation into account, the new energy-saving burner system is shown in Fig.5.
Theoretical calculation and CFD simulation are adopted to test, validation results of these two methods indicate that the pressure loss of the mechanism in this paper is in the actual burning allow range
(3) The CFD simulation results of the air suction institution of the burner show that pressure field is relatively uniform, flow direction of the velocity field in the ring canal is symmetrical, speed difference is small.

Cfd Simulation On Hydrodynamics Of Liquid-Liquid Slug Flow In Microchannel Wang Yi1,a Department of Pharmacy, Tianjin Medical College, Tianjin 300222, China awangyii_2013@163.com Keywords: CFD simulation; liquid-liquid; slug flow; microchannel.
Several CFD studies are available on the behavior of liquid-liquid two-phase slug flow in the microreactor.
A VOF based CFD methodology is developed to investigate the slug flow generation in a T-type mixing element considering the wall film.
The finite volume calculus in the commercial computational fluid dynamics (CFD) package of FLUENT 6.3.26 was used for the numerical simulations.
Fig. 3 - CFD simulated snapshots for the operating conditions corresponding to Fig. 2.