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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.

Simulation results show that the change of cavity shape is lagging behind that of gas supply.
In this paper, CFD technology is used to investigate effect of ventilation rate on supercavitation under three typical gas-supply scenarios.
In this work, detached eddy simulation (DES) method is used as turbulence modeling.
The Physical Model and Boundary Conditions for Simulation The physical model and surface grids for simulation are shown in Fig.1.
The number of total grids used in the simulation is 1215580.

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].

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.

Results of the simulation reveals that velocity has little effect on the flow field distribution.
In this research, with different inlet flow, the flow characteristics in cooling water jacket will be analysed based on CFD method for a better understanding of the effect mechanism for the cooling performance.
Results and discussions Based on the factors influencing the flow field, different conditions was adopted in the numerical simulation of internal flow in the engine cooling water jacket.
Two inlets were set in the simulations with one in the same side of the outlet and with the other in the opposite.
References [1]Ting Li: The Numerical Simulation on Steady-State Solid-Flow Coupled Head Transfer Problem in Engine Coupled System.

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.

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.

Simulation results allow to predict the optimum number of induced fractures.
Results A series of simulation studies were conducted to analyse the production performance of hydraulically fractured horizontal wells.
We define the dimensionless compressibility CFD which is: fres f xk wk CFD ⋅ ⋅ = kf : Fracture permeability.
When CFD = 300, the optimal number of fractures is10 and 8 will be recommended for CFD = 100.
Our simulations have shown that the optimal number of fractures is even smaller as the conductivity is lower.

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.

Numerical simulation for unsteady flow around the vertical axis wind turbine (VAWT) was performed through computational fluid dynamics (CFD) software Fluent, which was based on the UDF controlled sliding meshes method.
With using wind tunnel test and CFD two methods respectively to simulate the air dynamics performance of small VAWT, the results showed the two dimensional simulation result is significantly higher than experimental and three dimensional simulation [4].
Turbulence Model The turbulence model used in CFD calculation is SST k-ω model, it mixed the advantages of the model and model, and it also merges the cross diffusion derived from the equation.
Numerical Simulation for 2D Unsteady Flow Around the Vertical Axis Wind Turbine.
Numerical simulation of aerodynamic noise radiated form vertical axis wind turbines.