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In this article, based on thermodynamics, heat transfer theory and fluid dynamics control theory, the temperature field of motorized spindle with cooling system at steady state is studied by FEA and CFD methods.
Secondly, the three-dimensional model is imported CFX simulation module, and in this model the coolant is added into the cooling water storage.
The simulation process in detail was described in other paper and need not be repeated here.
Conclusion In this paper, the relation between the heat flux of motor and the flow velocity of coolant is studied using CFD and the comprehensive test method.
Simulation and experimental analysis for high- speed spindle with water-cooling system [J].

The simulation results are presented in Tables 3 and 4.
In future work, it is planned to incorporate more precise details of the models during simulations.
Ye, P., 3D Numerical Simulation of Aerodynamic Characteristics of a Gas Filter.
-H., Advanced cartridge design for a gas respiratory protection system using experiments, CFD simulation and virtual reality.
-H., Optimal Design of an Advanced Canister for a Next-Generation Gas Mask Using Cfd Simulation and Virtual Reality.

Meshing Process In CFD simulations applied to 3D concrete printing the mesh elements that fill the volume of the model, representing a discrete space that defines the local flow, so, a high-quality mesh is critical for obtaining reliable solutions and ensuring numerical stability.
A critical stage in 3D printing CFD simulation is the evaluation of the accuracy, sensitivity and robustness of the generated mesh grids.
Boundary Conditions In CFD simulations applied to 3D concrete printing, all CFD problems are defined by initial and boundary conditions, which must be specified correctly.
As example, for Large Eddy Simulation (LES) and Detached Eddy Simulation (DES) the symmetric boundary condition cannot be used due to the inherent nature of the eddies. 6.
Sankaran, Mesh quality effects on the accuracy of CFD solutions on unstructured meshes, J.

A Study of an Ion-Drag Pump Characteristics OSTAHIE Constantin Narcisa and SAJIN Tudorb ,,Vasile Alecsandri’’, University of Bacau, Bacău, România a ostahien@yahoo.com, bsajin_tudor@yahoo.com Keywords: electrohydrodynamic, ion-drag pump, dielectric liquids, CFD modeling.
In present, the methods of analysis the EHD pumps with modeling and simulation programs are presenting a big interest.
Using CFD software for numerical simulation of an electrohydrodynamic pump for dielectric liquids is useful for a better understanding of the process.
At an applied potential V=25 kV, the maximum average fluid velocity obtained from simulations is = 0.2 cm/s.
Summary Using CFD software to study ion-drag pump characteristics is useful for visualize and investigate the process of electrohydrodynamic pumping of dielectric liquids.

A more detailed study was conducted using a CFD model for unsteady flow, known as the Research Institute for Applied Mechanics, Kyushu University, COMputational Prediction of Airflow over Complex Terrain (RIAM-COMPACT) which is based on the Large-Eddy Simulation (LES) technique.
Annual energy generation (kWh), utilized capacity (%) and wind roses can be calculated from the 16 wind directions dependent simulation results entered into the systems.
Although 10 WTGs are set for simulation purposes, we will only focus on the further discussion for WTG 5 and WTG 7.
Micro-siting Technique for Wind Turbine Generators by Using Large-Eddy Simulation.
Ohya; Latest Developments in Numerical Wind Synopsis Prediction Using the RIAM-COMPACT® CFD Model—Design Wind Speed Evaluation and Wind Risk (Terrain-Induced Turbulence) Diagnostics in Japan.

At present, there are three study methods of flow fluid problem including model experiment, theoretical analysis and numerical simulation.
Numerical simulation is economic, efficient, and it can eliminate the problems of the limitation of existing error and security in the practical model test[3].
Based on computational fluid dynamics (CFD) software fluent, this paper emphasized 3D numerical simulation of the flow field in the scrubber by adopting k-ε model to establish the mathematical model and using SIMPLE algorithm to calculate.
(1) The k equation is: (4) (2) Theε equation is: (5) Analysis of the flow field simulation Simulations are calculated by changing the flue gas entrance angles in the condition of only gas gets into the scrubber.
Industrial Safety and Environmental Protection, 2008, 34(9) [3] S.A.Dudek, J.A.Rogers, W.F.Gohara.Computational Fluid Dynamics(CFD) Model for Predicting Two-Phase Flow in a Flue-Gas-Desulfurization Wet Scrubber.

By comparison with indicator diagram, simulation results were consistent with the test results using pure diesel and 5%(volume of n-butanol) n-butanol/diesel blends.
Diesel engine combustion and spray numerical simulation has become a kind of effective means for researching and designing diesel engine [3].
Fig. 2 and Fig. 3 are indicator diagrams of experiment and simulation results respectively using pure diesel and 5%(volume of n-butanol) n-butanol/diesel fuel mixture.
In general, the errors are within 5%.So the calculation model are reasonable and correct, which can be used for combustion simulation of fuel mixture.
Annual meeting papers of AVL,(2010) [5] Kong S C，Reitz R D: Application of detailed chemistry and CFD for predicting direct injection HCCI engine combustion and emissions[J]．Proceedings of The Combustion Institute.(2002)29:663-669 [6] Lehtiniemi H, Fabian M, Balthasar M．et a1: Modelling diesel ensine combustion with detailed chemistry using a progress variable approach[R].2005-01-3855.Detroit:SAE.(2005) [7] AVL, CFD-Solver_v2010_04_ICE-Physics-Chemistry, (2010) [8] D.C.

Plenty of researches on the flow and heat transfer characteristics of rotating long orifices were carried out by both experiments and CFD simulations.
And with the accumulation of existing experience and simulation data, the mathematical model of the long orifice is developed by programming.
(2) For the consideration of complex working conditions of low Reynolds number, high Mach number and supersonic flow, massive CFD simulations were carried out to achieve a generalized empirical correlation.
Therefore this model can be widely used in one-dimensional simulation of secondary air system.
“Secondary Air System Component Modeling for Engine Performance Simulation”.

Numerical simulation of the flow field in safety valve Xiaobin Ji1,a Xueyi Qi1,b Xiaoyan Li2,c Wanbin Jin3,d 1 Lanzhou University of Technology, Lanzhou Gansu China 730050 2 Chang’ an University, Xi’an Shanxi China 710064 3 Lanzhou Rede Mill Company, Lanzhou Gansu China 730000 ajixb.92018@yahoo.com.cn,bqixy@lut.cn,clxy2902050206@yahoo.cn,djinwanbin@163.com Keywords: safety valve; numerical simulation; stress turbulence model; flow field analysis; cavitation and flow noise Abstract: By using the Reynolds stress turbulence model at big Reynolds number condition and computational fluid dynamics, the data simulating calculation was carried out to the safety valve inner flow field with different opening size and different valve structural parameters.
FLUENT software was used in simulation calculation and analysis.
These two vortexes are the sources of cavitation, cavitation erosion and fluid noise; (2) The strength of the fluid noise is related with the intensity and size of vortex; the larger the valve opening size is, the stronger the vortex is, and the higher the flow noise is; (3) In the condition of the same valve opening, the larger the dead space at the bottom of valve cavity is, the stronger the vortex formed is, and the higher the flow noise is; so by reducing the dead space volume between lower cavity and seat as well as this among the regulating ring, the formation of vortex and flow noise in this space will be decrease or eliminated; (4) The shape of the disc has certain effect on improving velocity path line; (5) In the design and optimization of the safety valve structure, it offers a kind of effective design tools with simulating dynamic characteristics of the safety valve by using the computational fluid dynamics (CFD), a numerical simulation method.
[3] Feng jin, Zhang manlai, Huang tiancheng Study on Hydrodynamic Characteristics of Safety Valve Based on CFD Calculation Nuclear Power Engineering, 2007(5), 31-35
Simulation of the Dynamics of Spring-Loaded Safety Valve[R]，87-PVP-6.New York：ASME，1987.

The application of Computational Fluid Dynmaics (CFD) techniques can overcome the problem posed above by the integration of the Navier-Stokes equations in the rotor flow field.
Many turbulence models for aerodynamic simulations, such as Baldwin–Lomax, RNG k-ε, Spalart- Allmaras, etc., have been evaluated for the ability of simulating this type of complex flow.
Therefore, the SST k-ω model was chosen for the present simulations in the following work.
As illustrated in Fig. 1 two–dimensional CFD model is used to represent the VAWT and the wind tunnel domain.
Flow simulation parameters.