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The simulation results showed that the time lag effect caused by the reduced frequency is great.
The static state solutions are computed first as initial flowfield of the unsteady rock simulations.
The total time of rolling motion simulations advances lager than 4 rock cycles to achieve steady state solutions.
Numerical simulation of unsteady flow around double-delta wing during pitching motion.
Numerical simulations of Navier-Stokes flows about full aircraft configuration and the developing of CFD program.

Currently there are three types of methods based on the continuous N-S equation: direct numerical simulation (DNS), large eddy simulation (LES) and Reynolds average numerical simulation (RANS).
The simulation results are as follows.
Simulation Results.
Figure 5 shows the LB-LES method simulation results under high pressure.
The actual observation to this structure matches the LBM simulation result.

Usually, there are two methods for the fluid flow: experimental research and numerical simulation.
With the development of computational fluid dynamics (CFD), it has been possible to perform three-dimension numerical simulation to the whole machine of the pump.
The numerical simulation in the fluid machinery can replace the experiment to some extent, reduce costs, shorten development time, and provide rich information of the flow field and a new way for the fluid mechanical design.
Numerical simulation calculation Meshing and boundary conditions.
We can conclude that the simulation results of single stage are found to be in good agreement with real experimental value.

Numerical Simulation and Optimization of Urea-SCR Catalyst for Diesel Engine Dongcheng Wang1, a, Min Li*2, b 1Zhengzhou Nissan Automobile Co., Ltd., Zhengzhou, Henan, 450016, China 2Wuhan University of Technology, Wuhan, Hubei, 430070, China awangdc@zznissan.com.cn, blmwhut@163.com Keywords: Diesel Engine, Emission Control, Selective Catalytic Reduction, Numerical Simulation.
Numerical simulation of certain diesel engine Urea-SCR catalyst is carried out using computational fluid dynamics method.
[3] Soo-Jin Jeong, Sang-Jin Lee, Woo-Seung Kim: Simulation on the Optimum Shape and Location of Urea Injector for Urea-SCR System of Heavy-duty Diesel Engine to Prevent NH3 Slip[J].
[5] Miaomiao Wen: Simulation and Optimization of Urea Selective Catalytic Reduction System [D].Wuhan: Wuhan University of Technology, 2009(In Chinese)
[7] Weltens H, Bressler H, Terres F et al: Optimization of Catalytic Converter Gas Flow Distribution by CFD Distribution[J].

Numerical simulation Mesh division.
Simulation analysis.
The simulation of one-way valve in 4 different openings (10mm, 24mm, 38mm, 51mm) under the steady flow field were carried out.
l The numerical simulation can determine the position of the maximum energy dissipation.
ANSYS ICEM CFDANSYS ICEM CFD example explanation of mesh division.

S.Kumar, G.Cox, et al simulated the road tunnel fire using CFD approach, built the JASMINE mathematical model, and studied the dynamic development of temperature field and the smoke concentration field in a medium tunnel fire with various longitudinal wind velocities[5].
This paper focuses on the simulation of the smoke concentration field, temperature field, and velocity field in tunnel fires.
Non-steady calculation method was adopted, and the simulation time is 600s.
Simulation results and analysis The underground highway fire of 5MW and 10 MW were simulated with the ANSYS CFX to obtain the temperature field and the smoke field in 600 seconds in the tunnel.
Exhaust port wind velocity and exhaust port size were small in this simulation.

Finally, the numerical method (computational simulation) practically presents no restrictions, being able to solve complicated problems applied to complex geometries, and to generate results in a relatively short period of time, becoming faster and economical in relation to the other cited methods.
In RTM process, computer simulation is used to predict the resin injection behavior and thus to evaluate fill time, as well as to determine resin injection and exit points.
According to the various commercial software that can be used to study the RTM process, we can mention the PAM-RTMESI Group's, the RTM-WORX Polywork and the LIMS of the University of Delaware, which are specific applications for RTM, as well as the generic Computational Fluid Dynamics (CFD) software such as Ansys CFX and FLUENT, both from Ansys, and Abaqus / CFD (Abaqus), which are simulation tools for fluid mechanics and heat transfer problems, capable of working with complex geometries and simulating the advancement and curing of the resin inside the mold.
These works report information about experiments and simulations (1D, 2D and 3D analysis) applied to different shapes.
Table 1 – Process parameters used in the simulations.

Numerical Simulation on the Aerodynamic Characteristics Effect of Ribs Acting on the Cooling Tower HARAZIM Petr1, a *and VRÁBLÍK Lukáš1,b 1Faculty of Civil Engineering, Department of Concrete and Masonry Structures, Czech technical university in Prague, Thákurova 7, 166 29 Praha 6 - Dejvice apetr.harazim@fsv.cvut.cz, blukas.vrablik@fsv.cvut.cz Keywords: external surface wind ribs, natural draught cooling tower, wind pressure load Abstract.
Modeling wind ribs effects for numerical simulation external pressure load on a cooling tower of KAZERUN power plant-IRAN.
CFD investigation of flow in and around a natural draft cooling tower.

Thermo-mechanical (TMC) simulation of the electron beam welding process using FEM is presented in the paper.
More detailed experiments and numerical simulations are required.
An interaction between keyhole and welding pool during laser welding using numerical simulations was analysed.
The numerical model was developed based on the Fluent system which is a computational fluid dynamics (CFD) software.
The process parameters were the same both in the experiment and in the numerical simulation.

The simulation was validated by the experiment data in literature.
Fig. 4 is the error of the simulation result in Fig. 3.
Fig. 6 is the error of the simulation result in Fig. 5.
And the error is within ±15% between simulation and experiment.
CFD simulation of convective flow boiling of refrigerant in a vertical annulus.