Search results

The simulation result showed that the distributions of droplet nuclei and CO2 which were simulated by CFD were similar under the same ward airflow.
CFD was usually used to simulate the distribution of the droplet nuclei to analysis the pollution discharge effectiveness of indoor ventilation.
But the numerical simulation results were difficult to test because the discharge and detection of particle were difficult.
Tracer gas always had been used to replace the particle to be released to test the numerical simulation results of indoor airflow.
III.Simulation Results Using the steady state simulation, the velocity field and particle, CO2 concentration distribution in the ward after the convergence were as follows: The horizontal plane y = 0.4 (0.4m higher from the ground) through the exhaust outlet was located under the bed.

The CFD methods have been developed since 1960s on the basis of computational mathematics and theoretical fluid dynamics.
Most of CFD computer packages are based on FVM.
Algorithm for the numerical simulation: · formulation of numerical problem (definition of basic data); · construction of geometry of gas-dynamic area of air flow, i.e., the domain in the program for three-dimensional modeling of Unigraphics NX; · construction of mesh model of the domain in the mesh generator Icem CFD; · construction of a computational model with boundary conditions in the Ansys CFX, based on mesh model; · verification of the results of numerical simulation with experimental data.
This domain was imported to the mesh generator Ansys Icem CFD.
Construction of computing simulation model was carried out by means of Ansys CFX package.

The flow pattern and temperature distribution of molten steel in tundish were calculated by CFD and heat transfer method.
In recent years, with the rapid development of efficient numerical algorithm, fine turbulence model and computer hardware performance, numerical simulation prediction has been widely used in fluid motion.
To the tundish for a steel round billet continuous casting machine, this paper used CFD and heat transfer calculation method, calculated the effects of turbulence inhibitor on flow and temperature distribution of molten steel in tundish.
Chen, et al.: Physical simulation on gas curtain of single flow tundish, Refractories & Line. 38(5) (2013) 11-17
Garcia-Demedices, et al.: Mathematical simulation and modelling of steel flow with gas bubbling in trough type tundishes, ISIJ Int. 43(5) (2003) 653-658

Κ-ω SST turbulence model was used for the airflow simulations.
Table 1 Operating conditions used for the numerical simulations.
Aerodynamic simulation of runback ice accretion.
Mortensen, CFD simulations of an airfoil with leading edge ice accretion, in Department of mechanical engineering.
[10] http://www.newmerical.com/index.php/products/fensap-ice-cfd-software/

Ouellet et al.[2] validated the numerical simulation for isothermal and non-isothermal conditions through numerical simulation and experimental work.
Ajersch et al.[4] studied the spatial distribution of velocity, temperature and compositional variation in the pot by CFD technique.
In this paper, CFD technique has been used to study the effect of three different zinc pot designs on flow and temperature distribution.
All simulation were carried out under steady-state condition.
Fig. 8 Velocity for the three cases in z direction at height of 2450mm on the z-x plane (y=850mm) through the inlet Conclusions Numerical simulations of the temperature and velocity distribution in a typical zinc pot have been carried out by using a CFD technique.

In order to solve the problem of heat dissipation, a kind of fan cooling scheme has been designed according to structure characteristic of the controller, CFD software ICEPAK is used in the report to make a numerical simulation as well as a simulation analysis for fan cooling scheme and the original scheme, By comparing cooling effects of two cooling schemes, the fan cooling scheme can not only meet the cooling requirements, but also the structure is relatively simple. 
Introduction With the improvement of modern electronic equipment reliability, performance and power density, thermal design is more and more important .In order to achieve the best cooling effect,  according to different working environment, numerical simulations of thermal analysis software can greatly shorten the design time, improve the design efficiency [1].The software can simulate system’s thermal condition, it also can find the highest temperature of the product with simulation in the product design stage [2]. 
This paper focuses on the specific shape and power conditions, In order to solve the problem of heat dissipation, a kind of fan cooling scheme has been designed According to structure characteristic of the controller, CFD software ICEPAK is used in the report to make a numerical simulation .the results show that the fan cooling scheme can not only meet the cooling requirements, but also the structure o is relatively simple. 
JIANG: Simulation and Optimization of Heat Transfer Process for Columnar Radiator[J] journal of guangzhou university,2012,11( 3) : 81-85
LI, H.D LIU: Application of Thermal Simulation in the Structural Design of Electronic System[J]. electronics process technology,2006,27( 3) : 165-181

Although CFD has been acquired huge advance, aerodynamic heating is always difficulty in the CFD.
Generally, the factor of affecting the computing results for the aerodynamic heating are CFD format and grid, especially, near wall grid [1, 2].
Thereinto, research early emphasize particularly on CFD format, subsequently, change to grid [1-8].
So, to obtain the exact results of aerodynamic heating, we need not only choose appropriate turbulent model, but also ensure a appropriate y+ value which can be used in CFD.
Fig.1 Grid of the simulation model The results of different turbulent model are shown in Table 3.

A critical comparison between experimental data and results of the CFD analysis of the combustor is discussed.
The comparison between experimental data and results of the computational fluid dynamics (CFD) analysis of the combustor is discussed.
The choice of the models adopted and the computational grid has been made in order to have a good compromise between results reliability and acceptable computational cost (in terms of duration of each simulation).
In addition to the evaluation of the experimental data, the CFD analysis of the combustion process provides further details (Fig. 3).
In figure 4 it is summarized the comparison between experimental data and CFD results.

Numerical simulation can provide some flow structures and solid distribution data not easily obtained in cold model experiments.
With the development of the computational fluid dynamics (CFD) method, more and more applications of CFD were implemented on study of gas-solid flow in circulating fluidized beds.
The experimental value is slightly smaller than the simulation value.
“Kinetic theory based CFD simulation of turbulent fluidization of FCC particles in a riser,” J.
“Numerical Simulation of Gas-Solid Flow in CFB,” J.Computer Simulation, 2009, vol.26(3), pp.272-275.

In present study, the CFD simulation is done for a 3-D room and the required energy to achieve the thermal comfort in a room is calculated.
In the present work, the CFD simulation has been done to investigate the effect of building height on the energy consumption of the two radiator and floor heating system.
CFD Modeling and boundary condition The continuity, momentum and energy equations along with standard have been solved for simulation of the velocity and temperature fields in a 3-D room with dimensions of, as the figure 1 shows.
The geometry and condition of their experimental setup is the same as our CFD setup.
The comparison of CFD model and experimental data [5] for the unsteady case.