Search results

This paper presents the validation of a CFD model of a direct-flame impingement furnace for billet heating in a full-scale industrial situation, which was not previously published, and opens the way for more simulations and detailed studies of the phenomena that occur inside this type of furnace.
On the other hand, CFD models involve the solution of the partial differential equations that govern the reactive flow inside the furnace.
In the present simulation the average y+ was 3.3.
Note that in this simulation, only part of the industrial furnace was simulated.
Malikov et al. [2] report direct impingement furnace efficiencies of 70-80%, which are within the values obtained both in the energy audit and in the CFD simulations.

By solving the granular flow field for the pressure and velocity distribution on a given geometry using a general purpose computational fluid dynamics (CFD) code, we were able to analyse changes in surface roughness distribution from the process equation.
The immobilized cylinders were submerged in the top portion of the media flow field so as to facilitate comparison between media flow past the workpieces as experimentally observed and as predicted by the CFD simulations.
A granular flow dynamics model as well as the workpiece geometry were inputed into a CFD software package in order to calculate the pressure and velocity field.
The model and workpiece geometry were inputed into ANSYS CFX v. 12, a general purpose CFD package; and the pressure and velocity field calculated accordingly.
Tay, "Process modelling and simulation of vibratory finishing of fixtured components", Proc. of the 10th EUSPEN (European Society for Precision Engineering and Nanotechnology) Conf vol. 2, pp. 269-273.

Furthermore propeller design and simulation process plays vital important role in the whole ship design process.
It presents the numerical methodology to simulate the flow field in single propeller blade channel in open water using CFD software.
The reliability of CFD method is verified through comparison between the results of calculation and measurements.
Grid quality has great influence on calculation precision and efficiency during CFD simulation.
[6] Watanabe, T., Kawamura, T., Takekoshi, Y.: Simulation of steady and un-steady cavitation on a marine propeller using a rans cfd code.

Conventional dynamic derivative calculation method is through CFD simulation of micro aircraft forced harmonic vibration amplitude.
Calculated using frequency-domain dynamic derivative characteristics: (1) Calculated using the frequency-domain dynamic systems greatly reduce the computational overhead often cyclical unsteady CFD simulations.
Derivative of the unsteady horizon include forced harmonic vibration simulation method and free vibration simulation method.
Although compared with frequency domain method, time domain simulation is more accurate, but the large amount of calculation, the unsteady computational efficiency become the bottleneck of CFD application in dynamic derivative.
In the time domain simulation of the unsteady calculation efficiency problem, derivative efficient computing method of the further development of research, large-scale parallel CFD technology research and accelerating convergence technology research are needed.

Computer simulations of the VB method could be an effective tool to optimize the growth process and reduce the production costs.
The computer simulations of the growing process could be an effective method to reduce the costs of the experiment and search the best parameters.
The 2D CFD models are reported in CaF2 and CdTe material systems performed on the VB method and the melt is enclosed in rigid walls having the corresponding temperature profiles with the enthalpy-porosity based approach [9].
However, the numerical simulations have not yet been applied to the growth of PbI2 single crystals with VB method.
Based on the numerical results, the experiment of PbI2 crystal growth with VB method was also carried out to verify simulation parameters.

Rotor Cooling System Design and Fluid Field Analysis of MW-Level High-Speed Permanent Magnet Motor ZHANG Feng-ge1,a, DU Guang-hui1,b, WANG Tian-yu2,c, HUANG Na1,d 1 School of Electrical Engineering, Shenyang University of Technology, 110870,China 2 College of Mechanical and Engineering, Shenyang Institute of Engineering, 110136,China a zhangfg@sut.edu.cn, b duguanghui1104@163.com, c lnwangtianyu@yahoo.com.cn,dhuangna125@163.com Keywords: high-speed motor; rotor ventilation system; 3D fluid field; CFD Abstract.
Due to ventilation structure of high power high-speed permanent magnet motor is complex and rotor cooling is difficult, the rotor cooling system was designed for a 1020kw 19000r/min high-speed permanent magnet motor and fluid field calculation model was established through the fluid flow CFD simulation software, and then the solving regional and boundary conditions of the 3D fluid field was determined.
In this paper, rotor cooling system was designed for a 1020kw 19000r/min high-speed permanent magnet motor and fluid field calculation was carried out through the fluid flow CFD simulation software.
Fluid Field Calculation Results and Analysis velocity/(m/s) velocity/(m/s) Fig.6 Fluid distribution of solving domain Fig.7 Fluid distribution of whole motor axial length/mm Fig.8 Fluid distribution of air gap velocity/(m/s) velocity /(m/s) axial length /m slot width /m Fig.9 3D velocity distribution of air gap Through the CFD-fluent software calculation the ventilation system fluid distribution is got.
Summary Due to MW-level high-speed permanent magnet motor rotor is hard to heat, rotor cooling ventilation system is designed for a high-speed permanent magnet motor of 1020kW, 19000r/min, and the 3D flow field model and simulation calculation are completed and fluid distribution in any position of the cooling ducts is got.

Accuracy comparison with CFD simulation.
Fig. 6 CFD analysis model and calculation example The simulation shows same conditions to experiment.
The Fig. 6(a) shows grid configuration and other conditions, and Fig. 6(b) shows one of the examples of simulation result.
The effectiveness of proposed CFD estimated method also can be demonstrated.
(3) From the simulation results of CFD based on porous material element, it can be confirmed that the results are very close to the experimental results.

Numerical Analysis of fluid-structure interaction of Frame structure considering the impact of turbulent wind load Sun WenBin1,a 1School of Civil Engineering and Architecture, Liaoning Technical University, FuXin 123000 CHINA alnfxswb@sina.com Keywords: fluid-solid coupling, frame structure, turbulent, numerical simulation Abstract.
According to the basic principle of CFD simulation and methods, a framework structure was studied for its vortex-induced vibration and control principle of around the flow field, it revealed the characteristics of vortex-induced vibration and rules, systematically studied frame structure fluid-solid coupling effect and the flow field active control methods and mechanism.
Along with the development of improving the theory of fluid dynamics and computational fluid dynamics (CFD) method, which make it possible, that application of CFD method making use of computer simulation of fluid-structure coupled vibration.
Numerical Method and Implementation In the numerical simulation of wind engineering, When using the simplified method - the Reynolds-averaged model approach，Turbulence model plays a very important role in the method.
Ningbo. (2004) ,p456-462 [4] Assmoah.F: Discrete Wavelet Analysis of Signal [J], International Journal of Engineering Education. (1999), 36 :255-264 [5] Houchuan Liang, Yong-Lin Zhang: STATIONARY Numerical Simulation of random processes [J].

The Simulation Study on 3D Gas Flow Field and Structure Improvement with Tower Continuous Vacuum Dryer Zhijun Zhanga, Shiwei Zhangb, Chenghai Xuc School of Mechanical Engineering and Automation, Northeastern University, Shenyang110004, China a zhjzhang@mail.neu.edu.cn, bshwzhang@mail.neu.edu.cn, cxch1940@126.com Keywords: Tower continuous vacuum drying, Gas flow field, Structure improvement, CFD Abstract: The 3D gas flow field, including the gas pressure and gas velocity was studied by computer fluid dynamics simulation (CFD).
In order to illuminate the flowing characteristic of gas, the computer simulation is a useful method except for experimental research.
The Computational fluid dynamics (CFD) is a powerful tool to study the flow field of drying room.
Simulation of the hydrodynamics and drying in a spouted bed dryer, Drying Technology,2007,25:59-74 [4] ZHONG Siqing, CHEN Qingling, and CHEN Zhiqiang.
Turbulence Modeling for CFD.

AA*2=1M22κ+11+κ-12M2κ+1κ-1 (1) Because the area-Mach number relation is valid only for (ideal) isentropic flow, 2D and 3D simulations with the commercial CFD solver Star CCM+ from CDAdapco were performed in order to include the viscous effects from the nozzle walls.
In Fig. 2, the Mach number distribution along the x-Axis for the 1D area-Mach number relation and the 2D and 3D CFD simulations are plotted, where the throat is at x=0.
Near the throat -0.1CFD simulations.
To verify the isentropic mass flow rate equation, CFD simulations with two different settling chamber pressures were performed.
In Fig. 4 and Fig. 5 the CFD solution for the different settling chamber pressures are shown.