Search results

To investigate the mixing uniformity between tracer gas and gas stream in the duct, numerical simulations of the CO tracer gas and air mixing in a 300mm diameter and 90 degree elbow duct were performed on the commercial CFD software FLUENT, and the comparisons between the simulation results and experimental data were analyzed.
The results indicated that the tracer gas concentrations of simulations were agreed with the experimental data.
Experimental set-up and numerical simulations Experimental set-up.
The simulation results are showed good agreement with the experimental results.
The simulation results were in good agreement with the experimental data.

Numerical results can reflect the true hydrostatic bearing fluid movement, the actual simulation results provide a theoretical basis for optimization design of the Engineering hydrostatic bearing oil cavity.
In this paper, heavy duty lathe DVT500 is treated as a research object to conduct simulation analysis with the application of CFD popular software FLUENT ,in order to get a more accurate pressure field, temperature distribution of the oil film.
As the structure of the hydrostatic bearing is symmetry, the simulation only uses one-twelfth of it to conduct the research, as shown in Fig.4, the model should be saved as *. sat format when finished.
Fig. 2 DVT500 model Fig. 3 Oil pad model Fig. 4 Experimental model Fig.5 Mesh grid Experimental simulation Import the meshing grid, which is build by Gambit, into CFD software Fluent.
(3) Experimental data from the simulation experiment is basically consistent with the actual measurement data for heavy hydrostatic bearing and provides the theoretical basis for optimal design.

Thus the analysis of the influence of tip clearance on ducted propeller will be carried out using CFD method.
Fig.1 Ducted propeller model Fig.3 Grid of stationary and rotating domains Fig.2 Grid regions and boundary CFD method The complex turbulent flow around ducted propeller was simulated by solving viscous incompressible RANS equations in this paper.
After numerous simulations and processing, four clearances of 2mm, 1mm, 0.5mm and 0.1mm are illustrated below for comparison (Fig.5).
Similar simulation is conducted under design condition (J=0.55) with clearance sizes ranging from 0 to 2.5mm Fig.9.
[6] LEE Jeung-Hoon, JUNG Jae-Kwon, LEE Kyung-Jun, HAN Jae-Moon, PARK Hyung-Gil, SEO Jong-Sop: Experimental Estimation of a Scaling Exponent for Tip Vortex Cavitation Via its Inception Test in Full-and-model-ship, DOI (2012), p.658-667 [7] Han Baoyu, Xiong Ying and Liu Zhihua: Numerical Study of Tip Vortex Cavitation Using CFD Method, Vol. 32 (2011), p. 702-707

Numerical Simulation Study of Metal Transfer in MIG Welding with Magnetic Control Chao Yang1,a ,Shuyuan Jiang1,b, Haibo Bi1 1Institute of Aviation Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China a cyang25@163.com， b jsy80131@163.com Keywords: magnetic control, MIG welding, metal transfer, numerical simulation Abstract: This paper simulate the mode of metal transfer in MIG magnetic control welding by using CFD software FLUENT, establishing mathematical model based on fluid dynamics and electromagnetic theory, and simulate the form, grow and drop process of metal transfer with and without magnetic.
Recently, many scholars have deeply analyzed and made some strides in numerical simulation of drop transfer [3-4].
But the model of metal transfer have not been reported by using numerical simulation in MIG welding with longitudinal magnetic field, so this paper simulates the of metal transfer mode, by using software FLUENT, analyzing the magnetic field how to affect drop transfer.
Fig.5 Diameter change of drop transfer Fig.6 Height change of drop transfer with additional 1.8mT magnetic field with additional 1.8mT magnetic field Conclusions 1) Established the model of drop transfer in MIG welding with and without magnetic field by using FLUENT software, and the simulations under the condition of having 1.8mT magnetic field and without are come true.
Numerical Simulation and Control of Molten Droplet Shape in Short-circuit CO2 Arc Weld [J].

The main objective of this analysis is to evaluate the heat-shielding effects of design layout and operating parameters of helium cooling-pipes with cfd (computational fluid dynamics) techniques.
The main objective of this analysis is to evaluate the effects of ctb thermal shield in design layout and operating parameters of helium cooling pipes with cfd (computational fluid dynamics) techniques.
Therefore the reynolds averaged navier-stokes (rans) equations, in combination with shear-stress transport (sst) turbulence models are used for this cfd analysis.
For solid region, the following 3dimension heat conduction equations are used: (7) CFD Computational Models and Mesh Arrangement A full size model of ctb ts is considered in the cfd study as shown in Fig.3.
(2) An ideal contact (0 contact heat resistance) between panels and helium cooling pipes is assumed in this simulation.

So, numerical simulation of the liquid-solid two-phase flow field in discharge gap is conducted.
CFD Model DPM Model.
Fig.1 Configuration of layer-by-layer EDM milling Fig.2 3D geometry model of flow field Simulation Results and Discussion In simulation, the inner diameter and the outer diameter of the electrodes are 0.3mm and 1mm, respectively.
The data of nodes which lie in this line are exported from the simulation results.
Fig.9 Influence of dielectric inlet pressure on TWR and MRR Conclusions CFD model of dielectric fluid field in EDM milling was developed to predict the pressure contours, velocity contours, and debris concentration contours.

ANSYS CFX simulation software was used to determine the temperature fields.
Numerical simulations of temperature fields will be performed on the transport container with C-30 type designation.
A container with a flow of water and nitrogen within the casket was considered during the performance of numerical simulation.
[3] Z., Michalec, B., Taraba, M., Bojko, M., Kozubková, CFD modelling of the low-temperature oxidation of coal.
[8] M., Bojko et al, Characteristics of a mathematical model of the spiral heat exchanger using CFD ANSYS Fluent, Liberec, 2011. p.,17-19

Numerical Research of Deposits Formation and Influence on the Heat Transfer Process Lin MU1, a, Hongchao YIN1,b 1 School of Energy and Power Engineering, Dalian University of Technology, 116023, Dalian, China awwt650420@sina.com.cn, bhcyin@dlut.edu.cn Keywords: Ash Deposition, Deposits Growth, Heat Transfer, CFD.
In addition, deposition rate, deposits distribution and variations of deposits with the running time were also predicted by numerical simulation method.
The gas-solid two phase Eulerian-Lagrangian model based on Computational Fluid Dynamics (CFD) code is applied to simulate complex turbulent flow field, temperature field, stochastic particle trajectories and heat transfer process in the HRSG.
A strong deposition tendency along the simulation time is found in the HR3 with average deposition thickness nearly 11mm.
The results of numerical simulation have a reasonable agreement with the field measurement in the industrial scale HRSG.

With the rapid development and widespread application of computer, the simulation software can be used for numerical simulation.
Foreign researchers also did a lot work using CFD method [5].
Simulation Model and Boundary Conditions The simulation model based on FSI is established mainly including: three dimensional solid model, the grid model and calculation model.
The CFD simulation tool CFX can be used in fluid dynamics analysis, while the Workbench software in structure analysis.
Through the numerical simulation, the flow of three points when control valve is at different openings is attained.

Simulation results show that the velocity gradient and pressure gradient of the cone-type exhaust valve is smaller and more uniform than the disk-type exhaust valve, and the performance of cone-type exhaust valve is better than the performance of disk-type exhaust valve, which provides the valuable theoretical basis for the exhaust valve in the practical production.
Conclusions can be drawn from the simulation results that the cone-type exhaust valve is superior to the disk-type exhaust valve in the velocity distribution and pressure distribution.
Fig. 7 Static pressure distribution of the flat-type exhaust valve Fig. 8 Static pressure distribution of the cone-type exhaust valve Conclusions Two kinds of exhaust valve are designed and the flow field of the high temperature steam is simulated by CFD.
The three-dimensional simulation results can provide theoretical basis for the design of the exhaust valve and the performance improvement of the high temperature booster pump.
Wang: Computational Fluid Dynamics Analysis-CFD Software Principle and Application (Tsinghua University Press, Beijing 2008), in Chinese