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Online since: December 2014
Authors: Wei Zuo, Shun Kang, Xiao Ming Chen
The CFD calculation results, the experimental results and the Bladed results can be used to confirm the reliability of the model.
This paper calculates the CFD calculation, while experimental tests of pneumatic power and thrust were compared, including ‘CFD’, according to the results of the numerical calculation.
The CFD in the 8.5m/s, 11m/s and the rated wind speed of 14m/s involves three conditions of the results.
Firstly, the visible, for pneumatic power, at low wind Super 8.5m/s, secondly the CFD calculated values, which are slightly lower than the experimental values, and finally the other two conditions need to be in agreement with the calculated values for CFD.
Conclusions In this paper, the establishment of FlowVision numerical simulation on aerodynamic performance of wind turbine yaw effect based on the unsteady CFD, can be summarized as follows: 1) leaf segments and the application of the sliding grid method were used to calculate CFD in order to greatly reduce the number of grids and save computing resources; 2) in the axis, direction flow conditions, the numerical method can simulate the aerodynamic characteristics; 3) in the 11m/s wind shear conditions, this reduction canmore accurately reflect pneumatic power, while with regard to the variations in wind shear conditions of pneumatic power, thrust and torque performance parameters appear periodically; 4) the wake is constantly expanding, the expansion degree of different cross sections are different.
Online since: August 2012
Authors: Chao He Yang, Jun Wei Yang, Lan Juan Wang, Jia Zhi Xiao
Heat transfer of bottom tubes in delayed coking furnace: Simulation and measurement Yang Junweia, Wang Lanjuanb, Xiao Jiazhic, Yang Chaohed State Key Laboratory of Heavy Oil Processing China University of Petroleum, Qingdao, China ayangzwei12@163.com , bwanglan.j@163.com, cxiaojz@upc.edu.cn, dyangch@upc.edu.cn Keywords: heat transfer; numerical simulation; coking furnace; radiation Abstract.
With the development of computational fluid dynamics (CFD), numerical simulation is widely applied in the modelling of industrial furnaces and combustion systems[1, 2].
Hence, in the present work, CFD method was applied to simulate the processes of turbulence, combustion and heat transfer in the furnace with bottom tubes, the industrial experiment of adding bottom tubes was also conducted.
The DTM has shown good applicability for simulation of radiative heat transfer in industrial furnace with gas fuel[4].
The CFD simulation for furnace provides the heat flux profile of the bottom tubes, which is the input for the calculation programme of tube inside.
Online since: August 2014
Authors: Evgeny Burnaev, Ermek Kapushev, Stephane Alestra, Marc Dormieux, Antoine Cavailles, Davy Chaillot, Eugenio Ferreira, Mikhail Belyaev
This data base is generally available from wind tunnel testing or from CFD aerodynamic simulations and contains aerodynamic coefficients for different flight conditions and configurations (such as Mach number, angle-of-attack, vehicle configuration angle) encountered over different space vehicles mission.
Another type of data is numerical data resulting from CFD simulations, with a lower level of confidence, which depends also on the used numerical method (Euler / RANS, flow regime, etc.)
The data sets considered in this work contains output values obtained from two different sources (experimental measurements and CFD simulations).
However one of them (experimental measurements) is supposed to be more accurate than another (CFD simulations).
However, if region contains lots of HF experimental points then in this region CFD points should be treated as LF, whereas in region without experimental points CFD points become HF data (see Fig. 3).
Online since: February 2011
Authors: Xiao Chuan Wang, Guo He, Xing Long Pan, Xiao Ying Shi
In this paper, a three-dimensional model of WCB was established and based on which the flow and temperature fields were studied by computational fluid dynamics (CFD) computations.
Based on the CFD simulations, the geometrical three-dimensional models for WCB of diesel engine exhaust system were established, and four different structural ones (same in shape, but different inside) were analyzed: (a) WCB I-the given structure in Fig.1; (b) WCB II-the one with empty structure; (c) WCB III-the one with straight tubes; (d) WCB IV-the one with truncated tubes.
The irrespective influence of meshes on the simulation results was verified for the four models.
The results of CFD computations show that the difference in average temperature between gas-entry section and gas exhaust section is 48.3K (△T=48.3K).
Conclusions Numerical computations based on CFD codes are applied in this paper on four structural water-collecting boxes (WCBs), and distributions of inner flow and temperature fields are obtained respectively.
Online since: October 2011
Authors: Jun Jie Mao, Song Ying Chen
China achensy66@sdu.edu.cn, btfyt_123@163.com.cn Keywords: Chlorine-induced corrosion, Numerical simulation, Two-phase flow, Chloride deposition.
The use of CFD codes for modeling of two-phase flow, it is important to know whether or not deposition will be present in some sensitive location.
CFD modelling.
CFD model is shown in Fig. 1.
According to the results of numerical simulation, chlorine-induced corrosion is under-predicted.
Online since: July 2015
Authors: Zhen Hong Ban, Kok Keong Lau, Mohd Sharif Azmi
In other words, their simulation has ignored the bubble nucleation process and started the bubble growth simulation with pre-existed bubble nuclei.
The bubble growth dynamics is difficult to be accomplished by using classical Computational Fluid Dynamics (CFD) approach.
This was accomplished by coupling the bubble nucleation and growth model together with the hydrodynamics equations in CFD and population balance model (PBM).
Volume finite method was employed for the discretization of equations in the simulation.
The k-ε turbulence model was employed in the CFD solver to simulate the fluid flow in the computational domain.
Online since: December 2010
Authors: Wen Pei Sung, Ming Hsiang Shih, Yu Kuang Zhao, Ting Yu Chen
n Fig.1 shows the CFD simulation results that reveal a greater variation in the east wall outside temperature.
At 2:00 pm, the simulation indicates that the westward rooftop outside temperature rises with the moving solar radiation so that the thermal flow movement is the fastest at this place.
n The CFD simulated results are shown in Fig. 3.
At 8:00 am, the simulation indicates that under the influence of the cold current, the building outside temperature is lower than expected.
/Date Jul. 29.1 35.3 23.8 83.5 5.2 72 43/9 9 Apr. 22.5 30.9 14.8 303.0 5.9 72 45/28 13 Fig.1 The CFD simulation results of temperature (summer) (a) 8:00 am Fig. 1The CFD simulation results of temperature (summer) (b) 2:00 pm Fig. 2 The CFD simulation results of air stream (summer) (a) 8:00 am Fig. 2 The CFD simulation results of air stream (summer) (b) 2:00 pm Fig.3 The CFD simulation results of temperature (winter) (a) 8:00 am Fig. 3 The CFD simulation results of temperature (winter) (b) 2:00 pm Fig. 4 The CFD simulation results of air stream (winter) (a) 8:00 am Fig. 4 The CFD simulation results of air stream (winter) (b) 2:00 pm east wall outside temperature east wall inside temperature temperature difference 8:00am 10:00 am 7:00 pm Figure 5.
Online since: December 2013
Authors: Kalyan Prasad Sinhamahapatra, Nilotpala Bej
CFD study on the effects of nozzle number on turbulent flow and energy separation in a Ranque-Hilsch vortex tube Nilotpala Bej1,a, K.P.
Simulation results and discussion The simulations of multi-nozzles 3D models have been carried out on a 72 cores SUPERMICRO High Performance Computing (HPC) Machine.
Total pressure contours in RANS simulation with two nozzles Fig. 4.
Total pressure contours in RANS simulation with four nozzles Fig. 5.
Total pressure contours in RANS simulation with six nozzles Fig. 6.
Online since: October 2014
Authors: Qi Wang, Xiao Xu Chen, Jing Zhang, Ming Ming
The Research on Post Rolling of Aerodynamic Characteristics Numerical Simulation of Flow Field Qi WANG 1,a, Jun ZHANG 1,a, Ming MING1,a, Xiao-xu CHEN 2,a 1Department of Aviation theory1, Air Force Aviation University, Changchun 130022, China. 2Campaign & Command department, Air Force Aviation University, Changchun 130022, China aYuyangtao312@163.com Keyword: post rolling maneuver, CFD analysis method, aerodynamic characteristics, aerodynamic force, aerodynamic torque variation, the focus position Abstract: In this paper, according on post rolling maneuver and the flow field, we build a CFD analysis method about momentum source model flow field and aerodynamic characteristics.
Numerical Simulation of the Flow Field Time averaged Navier-Stokes equation can reflect the real the fluid mass conservation, momentum conservation and energy conservation, which is a Important method to describe the flow field and to analysis.
Numerical Simulation of Wing Aerodynamic Characteristics According to the post roll maneuver characteristics, based on the finite element method to complete the wing flow field analysis.
Unit energy is like below: (7) Unit dynamic dissipation power: (8) In an aircraft wing model, during its flight envelope typical operating conditions, complete the numerical simulation.
Development of rolling process, numerical simulation of dynamic characteristics of different design parameters influence on the flow field. 2) In order to flow a simple simulation post roll maneuver flow, computational accuracy in the circumstances allow, can try to use the Euler equation instead of solving N-S equations.
Online since: December 2014
Authors: Zhen Jie Hu, Xiao Fan Song
The Numerical Simulation of the Relation between Displacement Ventilation Efficiency and Different Outlet Position Zhenjie Hu1, a,Xiaofan Song2,b 1Architectural Design and Research Institute of Tianjin University ,Tianjin30072,China 2Tianjin Chengjian University ,Tianjin300384,China ahuzhenjie@tju.edu.cn, bsongxiaofan0413@163.com Keywords: Outlet position,CFD,Ventilation efficiency,Supply air velocity and temperature Abstract.
Using CFD software to simulate the indoor different ventilation system of different outlet position.
Fig. 1 Schematic diagram of physical model This paper use CFD to analysis the distribution of velocity field and temperature field in the displacement ventilation system with high sidewall outlet or traditional displacement ventilation .
The results and analysis of numerical simulation The used assumptions during simulation
The analysis and comparison of simulation results.
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