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Research on the Separation Performance of Deoiling Hydrocyclones Jun Wang1 1Jiangsu University of Science and Technology, Institute of Energy and Power Engineering, Zhenjiang, Jiangsu 212003 China Keywords: FLUENT; Oil Water Separation; Deoiling Hydrocyclone; Numerical Simulation; Abstract: This paper uses FLUENT as the researching tools of 3D numerical simulation of deoiling hydrocyclones, analysis on the geometric structure of deoiling Hydrocyclone, summed up a set of grid partition method based on the basic theory and turbulence simulation of CFD theory, to determine a reasonable mathematical model, boundary conditions, convection diffusion the discrete format and pressure velocity coupling algorithm.
From the simulation results of the fourth chapter, the greater the flow, swirler cut more to speed, the centrifugal acceleration will increase, and the separating efficiency is increased.
Numerical simulation on flow field of Hydrocyclone. thermal science and technology, 2005, 4 (2):164-168 [2] Liang Zheng, Ren Liancheng, Zhang Liang et al.
Turbulence models on the numerical simulation of the flow field of hydrocyclone selection. natural gas industry, 2007, 27 (3):119-121 [4] Zhao Lixin, Cui Fuyi, Jiang Minghu.
Numerical simulation of turbulent flow in a hydrocyclone.

As it is only possible to add influence of the centrifugal force in a virtual case, we choose an elaborated computational fluid dynamics (cfd) model for our investigations.
This model can not be used this way in a cfd simulation as the wall speed boundary condition for the impeller uimp would introduce a wall normal velocity component into the flow field due to the blades, as shown in Fig. 1b.
The simulations were carried out for various pressure jumps.
Each simulation of the next higher pressure jump was initialized with the solution of the former lower pressure jump.Fig. 5: Polyhedral cfd mesh.

Condensation on the collection area can be estimated based on numerical Hear-air and moisture simulation.
Approaching wind flow were measured with meteorological mast positioned west of the site (distance according to the CFD simulation 3H).
Additional were also recorded the wind direction, wind elevation, air temperature and the horizontal rainfall intensity in order to provide representative validation of numerical simulations.
KUBILAY et al.: CFD Simulation and Validation of Wind-driven Rain on a Building Facade with an Eulerian Multiphase Model.

Among these runs, the aligned one is chosen as the general posture for the transient simulation.
The general posture with an inlet water velocity of 2 m/s and a wall roughness height of zero is taken as the reference case for the comparison of the simulation results.
The simulation results are shown in the following figures.
The effects of swimsuit roughness play a more important role in the transient modeling than that in the steady-state simulation.
Turbulence model choice for the calculation of drag forces when using the CFD method.

Analysis on Cavitation Performance in Multi-stage Centrifugal Pump Based on Cavitation Model Si Huanga, Jun Guanb School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, China 510640 ahuangsi@scut.edu.cn, bguanjun8512@126.com Keywords: Multi-stage Centrifugal Pump; cavitation model; cavitation performance; numerical simulation.
The cavitation model and simulation were validated by comparing numerical solutions with tested curve of net positive suction head required (NPSHr) for the pump.
In particular, due to the joint evolution of computer power and the accuracy of numerical methods, it is now feasible to use CFD codes for the prediction of the complex three-dimensional cavitation flow in the entire pump and impeller-volute (or diffuser) interaction[2-4].
As shown in Fig. 5, the simulation results are close to measured results at designed condition and lower flow rates.
a) NPSH=4.91 b) NPSH=1.82 c) NPSH=1.41 d) NPSH=1.32 Fig.6 Vapor phase distribution in the front view of impeller in different NPSH a) NPSH=4.91 b) NPSH=1.82 c) NPSH=1.41 d) NPSH=1.32 Fig.7 Vapor phase distribution at the back of blade in different NPSH Conclusion Cavitation model based on Rayleigh-Plesset equation was applied in this study to simulate 3-D turbulent flow field and to predict cavitation performance of multistage centrifugal pump. 1) We know that the bubble distribution with changes of pressure and flow. 2) The comparison of calculated value and measured result of NPSHr shows that the cavitation model is more reasonable at designed condition and low flow rate condition. 3) The numerical simulation in this paper could instruct to pump optimization design.

We compare our simulation results with other reported experimental and computational results.
Introduction Computing fluid flow in a complex time-varying geometry is classically a difficult problem in the field of computational fluid dynamics (CFD).
Flow past a circular cylinder problem is a classic test problem in CFD.
The simulation is run for more than time units ensure it is a steady solution.

And the simulation results of pressure drop were validated by the experimental data.
But it can be get by numerical simulation.
Numerical simulation The process of dense phase pneumatic conveying fly ash in taper pipeline was simulated on the FLUENT platform of the CFD software, by using an Euler-Euler two fluid model of dense gas-solid two phase flow based on the kinetic theory of gas and granular with the pipeline geometric parameters that the taper angle 8°and the diameter ratio being 80mm/65mm and 65mm/50mm respectively.
The Numerical simulation model can be given as following.
Conclusions By the experiments and the numerical simulation above, we can conclude the following results.

The CFD (Computational Fluid Dynamic) method allows information on steel motion, flow, flow turbulence and steel temperature distribution in the tundish to be obtained.
The subject of simulation was a six-strand tundish unprovided with flow control devices.
The numerical simulation of steel flow was performed for whole test facility without the "symmetry" boundary condition.
The program Fluent was used to computer simulation
The results of this simulation are represented in Figs 7 & 8.

Wind load on complex-shape building, the wind tunnel test and numerical simulation were carried out.
Numerical simulation FLUENT CFD software was used to simulate wind flow patterns around complex-shape buildings.
The simulations are based on Reynolds-averaged Navier–Stokes equations (RANS) using the RNG-k- turbulence closure models.
The convergence criterion is set to 0.005 for all simulations.
The numerical simulation using the RNG k-turbulence model is a useful tool for the predictions of wind pressures on complex-shape buildings.

CFD Models of Internal Nozzle Flow and Spray Nozzle model.
The fuel is injected in a constant volume chamber, and the simulation for zone for the spray is simplified as a box with length of 12cm, width of 6cm and height of 6cm.
A transient nozzle flow simulation was carried out and the simulating data was written to a file with a predefined temporal resolution.
Fig.7 The structure of three types of nozzles Fig.6 Spray formation of single and coupling spray Spray simulation coupled with different types of nozzle flow.
The simulation of spray coupled with cavitating flow in nozzles performed via FIRE is helpful to disclose the relationship between the two parts.