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When ≤Re≤, we proceed numerical simulations using the LES model without wall functions.
The open source CFD software package OpenFOAM which is rapidly developing and outstanding in the crowd of open source CFD codes provides a good research platform for CFD numerical simulations.
The basic equations of turbulence models and related parameters 1.1 Large Eddy Simulation turbulence model Large Eddy Simulation model equation:
With the gradual increase in Reynolds number (from 1 to), it was divided into four phases: numerical simulations of two-dimensional laminar flow around a cylinder, three-dimensional numerical simulations of laminar flow around a cylinder, numerical simulations of turbulent flow around a cylinder with LES model, numerical simulations of turbulent flow around a cylinder with Spalart-Allmaras model.
LES turbulence model without wall functions was adopted in the time-domain numerical simulations.

Numerical Simulation on Flow Field of Screen Filter for Drip Irrigation in Field Q.L.
ZHeng 3, b 1College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi 832000, China 2State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan 430072，China 3College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China aquanli1871@126.com,bztg_1983@163.com Keywords: drip irrigation in field, screen filter, flow field, numerical simulation Abstract.
Based on CFD software Fluent, the flow field of screen filter was simulated numerically, and the results of calculation were analyzed in detailed.
With the rapid development of computer numerical calculation, the simulation of complex flow phenomena has become reality, and the internal flow phenomena and flow structure have also been exposed.
Based on CFD software Fluent, the flow field of screen filter was simulated numerically.

A three dimensional fluid flow model was set up in this paper, based on the computational fluid dynamics (CFD) and the elasticity theory.
Aiming at the problem of low granules, numerical simulation can be realized by assuming water with little sand as pipe flow with solid granules.
The pipeline is simulated numerically by using CFD with uncoupled, implicitly, unsteady and 3D solver.
Simulation results and analysis The sand is affected by gravity in the vertical direction and drag force of the water in the horizontal direction.
From the simulation results can be roughly seen in the 120°bend, the degree and the acreage of erosion is much larger.

China wangping010@163.com Keywords: Combustor, Primary combustion zone, Numerical simulation.
Method of CFD is used in this paper to simulate and calculate velocity field, temperature field and droplet track in PCZ(primary combustion zone) under the 3D two phase turbulent combustion for the ground idling, the peak, the middling and the altitude-small lever flying conditions.
Numerical simulation shortens the development cycle of the combustion chamber, saving development costs [1-4].
Figure 1 illustrates the shape of the combustion chamber for the simulation.
Reaction Kinetic Numerical Simulation of Combustion Process and Emission Formation in Aero-engine Combustor.

Its interactions between the building along the floodplain and the river dynamics can be simulated with Ansys Fluent as a simulation tool.
Ansys Fluent modelling is using CFD parameters, by creating geometric scenarios that have been physically tested.
From the simulation result, it is found that building geometry with larger openings is better at resisting the impact strength of floods and reducing the velocity of flood flows.
CFD Boundary Conditions CFD (Computational Fluid Dynamics) is the analysis of systems involving fluid flow.
CFD codes are structured around the numerical algorithms that contain three main elements: (i) a pre-processor, (ii) a solver, (iii) a post-processor [6].

CFD Simulation on Flow distribution in plate-fin heat exchangers Zhe Zhanga, Jinjin Tian and Yonggang Guo Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce, China 300134 axjtuzz@163.com Keywords: Plate-fin heat exchanger, flow distribution, header configuration Abstract: The influences of the conventional header configuration used in industry at present on the fluid flow distribution in plate-fin heat exchanger were numerically investigated.
Study of the flow maldistribution in a plate-fin heat exchanger CFD models A schematic view of conventional header is shown in Fig. 1, which has the geometrical characteristics listed as follows.
inlet tube header distributor Fig.1 Schematic drawing of the plate-fin heat exchanger (mm) In this work, CFD software FLUENT was employed to simulate the fluid flow distribution in the header of plate-fin heat exchanger.
It can be found from the above contrast that the tendency of the numerical simulation results and experimental results are the same and the error is little.

The software of computational fluid Dynamics (CFD) and the standard k-ε turbulence model are used in the numerical simulation．To simulate the coupling problems of fluid and solid，the numerical models by considering the heat transfer problem coupling with the solid and fluid have been developed．The internal flow field in PSSS was numerically simulated by an effective method for solving integrated coupling problems.
When carrying out numerical simulation must meet the following three continuity of boundary.
In the CFD calculation meshing is one of the important factors for solution accuracy and speed.
Numerical simulation results (a) Temperature field (b) Total deformation (c) Thermal strain Fig. 2 Numerical simulation results of outer cylinder The results showed that near bearing center appears uniform temperature distribution (as shown Fig.2 (a) ).
Takahashi: CFD Studies of Industrial Gas Turbine Exhaust Diffusers (Proceedings of the International Gas Turbine Congress Tokyo 2003) [2] H.

Through computer numerical calculation and image display, computational fluid dynamics (CFD) can analyze the related physical phenomena of fluid flow [4].
Fluent is currently the more popular commercial CFD software package, which has a lot of physical models, advanced numerical methods, powerful functions before and after processing, and the powerful grid support capabilities [5].
Numerical Simulation of Flow Field in Ash Hopper Collecting Process Based on Fluent Software.
Numerical Simulation of Flow Filed in ESP with Moving Electrode Type.
Alteration of flue gas distribution in the rectangular gas duct of electrostatic precipitator with CFD computation software. 2011, 5(2): 404~409

China, 110870 asccok1988@163.com, bliguodapple@sina.com, cji07619@126.com Keywords: Cold air supply, Air distribution, Numerical simulation.
With the development of computer technology, computational fluid dynamics (CFD) has been widely applied in various fields.
For hvac field, we can make use of the CFD method to numerical simulation of the air distribution of air conditioning room, recieving the temperature field distribution and velocity field distribution.
The Numerical Simulation Results.
Numerical simulation can well reflect the working area thermal environment, in order to design more reasonable, we could use numerical simulation analysis before the design.

But at present, the Fluent software was rarely used in the simulation of industrial crystallization, especially for 3D simulation of gypsum crystallizer[10-14].
Wei et al [17] solved the population balance equation for crystallization process related to the basic equations of fluid mechanics in an actual mold CFD study for the first time.
But the research was confined in the small size of a simple mold, and only a single-phase simulation was taken instead of multiphase simulation of the mold.
Computational fluid dynamics( CFD) simulations were performed under 100 r/ min for a developed industrial continuous crystallizer.
Therefore, the 3D simulation model of gypsum crystallizer based on CFD can be used to optimize the industrial crystallizer.