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Online since: October 2014
Authors: Fang Wang, Jia Wen Zhang, Ding Ding Yang, Yan Liu, Ya Le Zhao, Tang Li
In the field of refrigerators, many scholars have applied the CFD software to study the refrigeration performance.
The sketch map of four kinds of temperature distribution Simulation Results of Temperature Field and Analysis The simulation results of temperature are shown in figure3.
Simulation Results of Velocity Field and Analysis The distributions of velocity field are shown in Figure4.
[2] Cortella G,Manzan M,Comini G.CFD simulation of refrigerated display eabinets[J].International Journal of Refrigeration,Vol.24, No.3, 2001, pp.250-260
Moureh; Numerical Simulation of Air Flow and Heat Transfer in Domestic Refrigerators.Journal of Food Engineering, 2006, pp146-152.
Online since: December 2014
Authors: Bo Wan, Tao Sun, Chang Jiang Sun, Zheng Wei Ma
Multi-stage ejector design and numerical simulation for marine gas turbine Tao Sun1,a, Bo Wan1,b, Changjiang Sun 2,c & Zhengwei Ma3,d 1,2Harbin Engineering University, Harbin, Heilongjiang, 150001, China 2Military agent's room, Dalian Shipbuilding industry co., Ltd, Dalian, 160001, China 3703th Research Institute of China Shipbuilding Industry Corporation, Harbin, China aheu_jf@163.com, bswatwan@qq.com, cscj4@163.com, d153663650@qq.com Keywords: ejector, multi-stage, numerical simulation, marine gas turbine Abstract: With the continuous development of infrared-guided weapons, the survival of ship at sea faces increasingly challenges especially high-risk waters.
By using turbulence model, the vortex viscosity coefficient can be simulated, and then it gains the general expression about the turbulent kinetic energy and dissipation : (6) (7) Modeling for Exhaust Ejector In order to facilitate the numerical simulation, the new marine gas turbine ejector model was simplified.
Numerical Simulation and Analysis of the Model Boundary conditions: Mainstream inlet: mass-flow-inlet Pressure=103900Pa, Mass Flow Rate=27.8kg/s, Total Temperature=893K, Primary ejecting inlets: pressure-inlet, Pressure=101325Pa, Total Temperature=300K, Ejector export: pressure-outlet, Pressure=101325Pa, Total Temperature=300K, Inlet and export the location of the ejector device as shown in figure 5.
Experimental and CFD Study of Exhaust Ejectors with Bent Mixing Tubes[J].
Experimental and CFD Study of An Exhaust Ejector with Round Entraining Diffuser[J].
Online since: September 2011
Authors: Xiao Qing Du, Yan Zhao
Large Eddy Simulations of Flow past a Circular Cylinder With/without an Upper Rivulet Xiaoqing Du1, a,Yan Zhao1, b 1Department of Civil Engineering, Shanghai University, Shanghai, China axqdu.shu@gmail.com, bzh_yan@live.cn Keywords: Stay cable; Rain-wind-induced vibration; Upper rivulet; Large eddy simulation; Aerodynamic force coefficient Abstract.
Large eddy simulation (LES) is utilized to simulate flow around a circular cylinder with/without an upper rivulet at Reynolds number 70000.
With the improvement of CFD technology, CFD numerical simulation is also utilized in this research field.
Yeo and Jones [4] conducted a simulation of full developed turbulent flow past a yawed and inclined smooth circular cylinder at Re=1.4×105, and the detached eddy simulation (DES) method is adopted.
Finite Volume Method is introduced for spatial discretization in the simulation.
Online since: June 2004
Authors: Roland Madar, Michel Pons, Didier Chaussende, Ludovic Charpentier, Francis Baillet, Etienne Pernot, Laurent Auvray
Keywords: Bulk, Chemical Vapour Deposition, Physical Vapour Transport, Silicon Carbide, Simulations.
EDS mapping, X-ray diffraction and the combination of a simplified thermodynamic model with simulations demonstrated that this transfer results from successive steps of deposition, sublimation and condensation of silicon carbide inside the porous medium at temperatures above 2073K.
Temperatures inside the source material were evaluated using CFD-Ace software [5], including equations of mass conservation, electromagnetic and energy balance.
The simulations presented in a previous study [6] were improved by taking into account a porosity of 97% of the source material, enabling gas flow and radiation through it.
[5] CFD Research Corporation, 215 Wynn Drive, Huntsville, Alabama, 35805
Online since: June 2012
Authors: Si Yu Gao, Hui Ding, Kai Cheng
Firstly, the ultra-high speed air bearing spindle is designed, including grooved hybrid air bearing, helical water cooling channel and built-in motor, etc; Subsequently, pneumatic hammer instability and whirl instability of air bearing are studied; The thermal-structural behaviors of the spindle system at ultra-high speeds are investigated by using structural FEA coupled CFD; Static and dynamic performance of spindle is studied to predict the stiffness, modes and natural frequencies of the spindle; Lastly, system optimizations are conducted to obtain optimal performance and dynamic behaviors of the spindle.
In order to achieve the high performance of the spindle, an integrated approach, including the design, calculations and simulations on the spindle system, should be done in the design stage, as shown in Fig. 1.
For this reason an accurate Computational Fluid Dynamics (CFD) analysis is necessary to map the stiffness of the bearings against the speed, to improve the dynamic model [14].
Based the analysis of the evaluation on the thermal loads, conduction and convection coefficients in each part of the spindle and applying energy balances both in steady-state and transient conditions, developing a thermo-structural model by using structural Finite Element Analysis (FEA) coupled Fluid Simulation (CFD) to describe the temperature distribution of a complete ultra-high speed air bearing spindle system [9].
Through simulation, calculation and optimization of the spindle system, starting from the bearing performance and ending with a comprehensive dynamic analysis of the entire system, a reliable and powerful spindle can be obtained, meeting all of the design specifications in the design stage.
Online since: December 2012
Authors: M.N. Anas, S. Rad, M. Normahira
Computational fluid dynamics (CFD) has been used before to model porous medium flow in scaffolds and bioreactors [3].
It must be noted that the simulations was conducted without scaffolds because he wants to determine appropriate locations for placing the scaffolds.
However, for the CFD simulation, the scaffold is designed by using SolidWorks 2011.
The fourth step is setting up the CFD simulation.
The fluid flow analysis has been conducted by using CFD, ANSYS Fluent.
Online since: March 2014
Authors: Si Chen, Zun Ce Wang, Jin Gang He, Si Jie Mei, Feng Xia Lu
We use Fluent software to establish the model of flow field,and use numerical simulation method to analyze the erosion wear.
The numerical simulation can be largely reflect the results.
Therefore, the numerical simulation method is correct.
Numerical Simulation for the Motion of Dilute Solid Particles in Centrifugal Pump[J].
[5] Wang Zunce,Chen Si,Li Sen,Xu Yan,Numerical Simulation of Particle Impact Erosion within Eletric Submerible Pump Based on CFD[J].Oil Field Equipment,2013,42(5):31-34.
Online since: August 2012
Authors: Jing Ping Wu, Shun Huai Chen, Ji Cheng Xiao
Numerical Calculation of the Pressure Distributions on a Rudder Surface Jing-ping WU 1, a, Shun-huai Chen2,b and Ji-cheng Xiao 3,c 1 Wuhan University of Technology, Wuhan 430063,China 2 Wuhan University of Technology, Wuhan 430063,China 3Tianjin Branch of China Classification Society, Tianjin 300457, China awujp_68@yahoo.com.cn, b chenshunhuai@163.com, c jcxiao@ccs.org.cn Keywords: Pressure distribution, Viscous flow, Numerical simulation, Rudder Abstract: This paper numerically calculates the pressure distributions of a rudder of a ship for structure strength design.
With the rapid development of computer technology and CFD (Computational Fluid Dynamics), numerical simulations of viscous flows around rudders are actively conducted, for example, the researches of Qiu, Zou and Zhang (2003) [1], Wang and Ye (2006) [2], etc.
Meanwhile, the commercial CFD softwares for viscous flow, such as FLUENT, FLOW3D, CFX and Star CD etc., are widely applied to practical engineering.
(a) NACA0020 (b) NACA0012[4] Fig. 3 The curve of Cp versus Rex or x 3D Simulation of The Rudder Computing Model and Mesh.
Clarke: Simulation of a wing body junction experiment using the Fluent code.Platforms Science Laboratory, Defence Science and Technology Organization, Department of Defence, Australia Government.
Online since: November 2012
Authors: Hussain Hamoud Al-Kayiem, Tawfeeq W. Salih, Dhinakaran Govindasamy
The numerical, and consequently the CFD techniques have been found to be a powerful tool to analyze the supersonic intakes and flow field within the parts of the intake to improve the design and the performance of the aero engines.
Ref. [4] solved the governing equations and boundary conditions using flow simulation software FLUENT.
The internal part of the intake is analysed by CFD technique based on finite difference approximation.
The external part is solved by using the isentropic one dimensional gas dynamics relations, while the internal part of the flow field is modelled and simulated using CFD techniques.
Coupled Analytical/Numerical Simulation Procedure In the present analysis, the flow field is subdivided into two parts.
Online since: February 2011
Authors: Hermawan Judawisastra, Indra H. Nugroho, M. Giri Suada, Mardjono Siswosuwarno
The aerodynamic load is determined using a computational fluid dynamics (CFD) software.
The simulation is done in the rated wind-speed of 10 m/s.
Fig. 3 Flowchart of the design process CFD Simulation of Wind Turbine Aerodynamic Loads The simulation is done in the rated wind-speed of 10 m/s in order to obtain the aerodynamic load.
The result obtained from CFD simulation is total pressure.
This condition eases the matching process between CFD and FEM models.
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