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During virtual simulation (with CFD Computational Fluid Dynamics software) there were conducted similar to real experiments with the use of scanned rotors (with 3D scanner) and same environment conditions.
During virtual simulation with CFD calculation there were conducted equivalent to real experiments, where scanned with 3D scanner rotors and same environment conditions [18] were used.
Virtual experiments for lifting force determination and gap distance optimization were conducted with CFD software SolidWorks Flow Simulation 2012 [20] on simplified quadrotor helicopter model with scanned models of 10 in rotors.
Optimal distance between rotors for creating 3 N lifting force Conclusion This paper describes comparison between virtual simulation of quadrocopter and real experiments and shows that CFD results are trustworthy.
CFD results are proved by real experiments.

The volume of fluid (VOF) method was used for tracking of free surface in simulation program.
CFD Model Time-Averaged Flow Equations.
From Fig. 2 the CFD model predicts accurate data in comparison with experiments.
The grids used for the simulations consist of 150×61 rectangular cells.
The CFD model results exhibit well with experimental data.

This method was developed by Ahmed [10] and his research has been used as a validation parameter for CFD simulations because it has many studies on this vehicle (Figure 6).
These actions can now be done by the team in parallel with new fluid dynamics simulations in CFD software, comparing the results and verifying the feasibility of applying the improvement.
A Review on Aerodynimcs Study of Vehicle Body using CFD.
Aerodynamic Analysis of a Computational Fluid Dynamics Simulation (CFD) Energy Efficiency Prototype.
CFD Lett. 3, 3239. (2011)

Based on empirical measurements and then comparing the results with CFD simulation, the analysis exposed the distribution status of indoor hydrogen sulfide and its diffusion behavior.
The conditions of a healthier and more comfortable air environment were then obtained through CFD simulation, providing as reference to create an optimal design space for bath houses.
The correlation of the flow distribution of hydrogen sulfide with the space structure was discussed through empirical measurements and CFD simulation.
- CFD simulation Model description The indoor flow field simulation in this is study applied CFD analysis to discuss the possible patterns for flow field control at the bath site.
The relation between the variations of hydrogen sulfide concentrations with the building’s indoor space among Datun mountainous area was calculated through CFD simulation.

Simulation Analysis and Design of Intake Restrictor of FSAE Race Car Chuwei Chen*1, a, Wei Du2, b, Jiaqi Sun3, c, Wei Liu4, d, Yuan Chang5, e, Wei Dong6, f 1State Key Laboratory of Automotive Simulation and Control, Jilin University, 5988 Renmin Street Changchun, China achencw1511@mails.jlu.edu.cn, bduwei1511@mails.jlu.edu.cn, csunjq1511@mails.jlu.edu.cn, dliuwei1512@mails.jlu.edu.cn, echangyuan1512@mails.jlu.edu.cn Keywords: CFD analysis, intake restrictor design, nozzle design, FSAE race car Abstract.
For the intake restrictors which are designed in line with FSAE race stipulations, this paper carries out compute simulation on the convergent section and divergent section of the intake restrictors via CFD software; the paper systemically analyzes the distribution characters of its flow field, thus obtaining optimal design scheme.
According to Literature [12] and [13], Spalart-Allmaras (1eqn) turbulence model provided by CFD software FLUENT is an eddy viscosity model.
CFD Simulation Results and Analysis The relationship between the converging half angle of the intake restrictor and the nozzle flow Under the condition of keeping the divergent section (divergence half angle is 11°) and the throat of the restrictors unchanged, the converging half angle is changed, and calculation is carried out under the conditions when the converging half angle is set as 10°, 20°，30°, 40°, 45°，50° and 60° respectively.
This is similar to the phenomenon in this experiment; meanwhile, it also verifies the accuracy of this simulation.

Thus, the development of numerical optimization and simulation software becomes a tool for achieving results through virtual simulations only, without the immediate need for prototyping, reducing time and costs in project terms.
The use of CFD resources in the design and development of products is attractive mainly due to reduced cost by reducing experimental attempts [1].
Metodology The CFD simulations are performed using the ANSYS CFX® software that uses the finite volume method to perform the fluid dynamic calculations.
Simulation results compared with experimental data.
Thermal-Hydraulic CFD Study in Louvered Fin-and-Flat-Tube Heat Exchangers.

Experiments of 300 mm wafer ashing 300 mm wafer asher, SUPRA-V+ (PSK Inc.) was modeled and calculated to check the validity of the CFD simulation.
From CFD simulation, temperature distribution in the chamber and oxygen radical flux distribution over wafer surface were calculated as shown in Fig. 3 and compared with these measurements.On the wafer surface oxygen radicalsare distributed evenly by diffusion, and higher density was observed in the vent plate and exhaust line.
(Fig.3)Results of CFD simulation;(a) Temperature distribution and(b) Velocity vector pattern.
(Fig.4)CFD simulation result;(a) Temperature and (b) Velocity variationsover 450 mm wafers.
(Fig.5) CFD simulation result;(a) Density and (b) Flux variations over 450 mm wafer.

However, the computing resources of most CFD simulations required are very large, especially some complex problems.Reasonable experimental design method can effectively reduce the number of tests [1].Optimization based on approximate model enables shorten the optimization time several orders of magnitude [2].
Attack angle and ground clearance of the airfoil have a decisive impact on the CD and CL[3].In this paper, the optimal results obtained based on the response surface model instead of CFD simulation program.
Sample points of different group Numerical Simulation NACA2412 airfoil was selected.
Model Establishment and Verification By using CFD method, the results of each sample point were placed in table 1.
This method is very when the simulation need huge computing resources and computing time.

In this paper, numerical studies have been conducted in order to evaluate the efficiency of a vertical axis wind turbine by using CFD methods.
Results indicate that the poor accuracy of the URANS CFD method is mainly due to its limitation in the vortex modeling.
Two CFD methods was use to estimate the power coefficient for this wind turbine.
A difference between these two CFD methods can be observed.
Carissimo, „Best practice guideline for the cfd simulation of flows in the urban environment“, May 2007 [14] H.

Hossainpour and Binesh [3] highlighted the prediction of droplet spray models in a CFD code.
The numerical study on diesel engine simulation with respect to injection timing and the air boost pressure was carried out by Jayashankara et al. [7] using commercial CFD code.
From the CFD simulation, they observed that increase in cylinder pressure, cylinder temperature and NOx emissions results from advancing the injection timing.
The droplet parameters are analyzed from the simulation.
The in-cylinder averaged pressure during the non-firing mode of simulation is also shown in Fig. 4.