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Research of Flow Field and Temperature Field in 2D Annular Space of Air-Gap Lu Tang, Yiping Lu, Haiyan Deng and Zuomin Wang School of Mechanical & Power Engineering, Harbin University of Science and Technology, Harbin, China e-mail: luyp2010@ yahoo.com.cn Keywords: Numerical Simulation, Rotating Flow, Air-Gap, Turbo-Generator, Radiation Heat Transfer Abstract: The flow in air-gap of turbo-generator was simplified to the rotating flow model in the 2D concentric cylinder annular space.
According to the CFD principle, the rotating flow model equations of the laminar flow and the turbulent flow were solved with Finite Volume Method.
Etc studied the characteristics of inflow slot wedge and outflow slot wedge of gap-pickup turbo-generator adopting RNG k-ε turbulent model by fluent software for numerical simulation [3].
M.Kuosa. etc studied the characteristics of flow and heat transfer in air gap of electrical machine with 10 000-80 000rpm by experiment and numerical simulation with k-ε sst, k-ω turbulent model and so on using FINFLO[4] software and the results of numerical simulation of turbulent time-averaged model did not appear taylor vortex is discovered.

The results show that data from experiment and simulation have the same trend and in good agreement.
To simulate the complex flow patterns inside the hidden ceiling fan and outside the space, the commercial CFD software Fluent is utilized to solve the fully three-dimensional incompressible Navier-Stokes equations with the standard turbulence model.
The deviation between experiment and simulation is -10.51%.
The deviation between experiment and simulation is -11.13%.

Numerical simulations were carried out using Gambit-Fluent software.
The simulation parameters and flow patterns are outlined in Table 3.
Zálešák, COMSOL Multiphysics validation as simulation software for heat transfer calculation in buildings: Building simulation software validation.
Starace, CFD simulations of horizontal ground heat exchangers: A comparison among different configurations, Appl.
Hellström, CFD-modelling of natural convection in a groundwater-filled borehole heat exchanger, App.

The ANSYS Fluent software is used in a 2D simulation to predict the heat transfer coefficient and the flow fields.
First, the CFD software tool ANSYS Fluent was used to simulate each parameter and based on the simulation results several improved parameters were selected to make a mockup sample.
Based on the results of the simulation, the four types of designs that were used for the divergent structure are displayed in Figure 8.

Liao[3] conducted numerical simulation on the structural parameters of the micro heat transfer.
Luping, Chen Jiangping, et al[7] adopted the CFD method to conduct a simulation study on the distribution characteristics of internal flow inside the micro-channel parallel flow air cooler.
Stief, et al[8] conducted the simulation study on the thermal conductivity of micro heat transfer.
Numerical simulation and performance optimization of carbon dioxide micro-channel gas cooler[J].
Computational fluid dynamics simulation of flow distribution in a gas cooler with micro-channel parallel flow[J].

The wind speed is assumed to be constant for all simulations and equal to the aircraft’s approach speed.
Simulation Model Five wind turbines and wheel 3D geometries have been modeled using an ANSYS modeler design, as shown in Figure 7.
Simulation Modelling Practice and Theory 17.7 (2009): 1290–1298
[27] Wilcox, D.C., “Turbulence modeling for CFD”, 1st ed., La Canada, CA: DCW Industries Inc., 1998
[28] Okumura, K., "CFD Simulation by Automatically Generated Tetrahedral and Prismatic Cells for Engine Intake Duct and Coolant Flow in Three Days," SAE Technical Paper 2000-01-0294, (2000)

Simulation and Analysis of a Micro-fluidics Cooling System X.W.
Using FLOTRAN CFD of ANSYS, the initial velocity and temperature constraints are applied to the inlet of the high temperature area and the relative pressure applied to the outlet of the low temperature area is set as zero.
Simulation and analysis Using ANSYS FLOTRAN and the FEM model, the micro cooling system is simulated, when the channel width and depth is 200 and 100 micrometers respectively.

From the simulation results, it was found that tire width has a noticeable effect on tire-pavement noise.
Tire-Pavement Noise Simulation Model Fig. 1 shows the geometry of tire pavement noise simulation, which consists of two sub-models: the tire-pavement interaction sub-model and the near-field sound propagation sub-model.
However, for a proper simulation of sound, air compressibility must be considered within the large eddy simulation (LES) model.
Sagaut, Large-Eddy Simulation for Acoustics, Cambridge University Press, Cambridge, 2007
Zhang, A mesh adaptivity procedure for CFD and fluid-structure interactions, Computers Structures, 87 (2009) 604-617

During the simulations, the process parameters and the alloy properties have been explicitly taken into account.
Finally, results of the simulations are compared with experimental data.
Results and discussion Background: Computational modelling of casting process is part of the computer aided engineering (CAE) development, and in particular it considers computation fluid dynamic (CFD) dealing with thermal- and fluid-flow analysis.
The basic principles of the simulation set-up are the considerations of the process parameters, the material properties and of how they can be varied to obtain the optimal simulation, which is as much as close to the actual casting as possible.
As mentioned above, one of the critical points in the simulation results is represented by the mesh size.

The research aims at determination of optimal shape with use of numerical simulations of heat transfer and calculation of pressure drops.
Numerical simulations were carried out in software Calculation Area (CalA) [10], which is suitable for 2D simulation of heat transfer with steady-state and transient boundary conditions [11].
Steady-state simulations of ventilation ducts with 50 mm insulation show heat flux q in range 7 - 8W/m2 without influence of radiation.
Thermal CFD Analysis of Tubular Light Guides.
Šikula: Transient Numerical Simulation of Linear Thermal Transmittance in Software CalA.