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3D CFD Based Optimization Technique for Muffler Design of a Motorcycle Mohammad Ahsan Habib1,a*, Md.
To measure the back pressure 3D CFD based CAE software has been used.
Middlberg et al. present different configurations of simple expansion chamber mufflers, including extended inlet or outlet pipes and baffles have been modeled numerically using CFD in order to determine their acoustic response [8].
In summary, most of the research studies are based on the formulation of mathematical equation and its virtual simulation and trial and error method.
By using the above mentioned simulation conditions and different muffler design ANSYS simulation (Fig. 3) is conducted and the back pressure values are tabled in Table 3.

Few papers have been published on this subject, but Yang[11], Wang[12] have detected velocity slip in PAT runner by numerical simulation, which is derived from axial vortex.
The characteristic curves of head, discharge and efficiency in pump and turbine modes achieved by CFD methods were shown in Fig.5.
Stepanoff and Pfleiderer did not show acceptable results in comparing with the CFD data for both of the head and the discharge, but the results of presented method were in good agreement with CFD data.
Results show that the predicted h,q and λ at BEP by this method were in good coincidence with CFD data.
(in Chinese) [12] Yang Sunsheng, Kong Fanyu, Su Xianghui, Numerical Simulation and Performance Experimental on Pump and Pump as Turbine, J.

This paper uses Computational Fluid Dynamics (CFD) software FLUENT to study the flow field of oil air, and different air pressure and nozzle throat size are discussed.
Many scholars research the nozzle used Computational Fluid Dynamics (CFD).
Dong [4] studied a new kind of two-stage atomizing high pressure spray nozzle used CFD, and the two-stage atomizing nozzle were optimized successfully.
Jeyakumar [6] studied the flow pattern of atomizing gas in the atomization process used CFD.
This paper used CFD software FLUENT to study the flow flied of oil air jet, and the diameter distribution at different air pressure and throat diameter of the nozzle.

This paper presents a simulation of falling behavior for a torpedo anchor using a CFD model and analyzes the effects of hydrodynamic parameters to the directional stability of the free-fall anchor.
Naming the model as H4.36 (named using ‘H’ and ‘x value’), the 300m height falling procedure of the model, from 2700 to 3000 m undersea, can be simulated by using a CFD software.
Table 1 summaries the simulation results of the above three models.
Simulation results.
The simulation results of the three models are listed in Table 2.

The flow characteristic and differential pressure-flow of inlet blockage fault and trouble-free for control valve are numerical simulated by CFD.
Fig.2 Valve core shape Fig. 3 Ideal flow characteristic curve Blockage Fault Simulation Flow Model and Meshing At the interface section of valve and pipeline, the block of 80 mm high and 45 °gradient is designed to simulate the internal flow field of inlet blockage fault.
Table 2 Simulation Settings settings solver turbulence model media boundary conditions parameters separating Standard k-ε equation mixed gas pressure inlet / outlet Analysis of Simulation Results Analysis of Flow Characteristic Fig.5 is the flow characteristic of trouble-free and inlet blockage.
Conclusion Establishing the valve trouble-free and inlet blockage flow model, and applying the CFD numerical simulation of flow characteristic and differential pressure-flow, obtained the following conclusions
Process Equipment﹠piping, 2009, 46(2):47-51. ( in Chinese) [4] Yantao An, Rujian Ma, Yong Wang, Simulation and Analysis the Internal Flow Field of Control Valve Bonnet Leakage, Applied Mechanics and Materials [J], 2013, 425, 2078-2081

In recent years, the virtual prototyping technology(VPT) has became main research approach in aerodynamics and dynamics researches of automobile with the popularization of mechanical system simulation software and computational fluid dynamics(CFD) software.
Linear step crosswind is chose to perform the simulation.
The simulation is performed respectively.
Computational Fluid Dynamics (CFD) Simulation of Drag Reduction by Riblets on Automobile.
Use the CFD for the Aerodynamic Optimization of the Car Shape: Problems and Application. 4th European Automotive Simulation Conference.

The Investigation of Turbulence Models Based on Numerical Simulation Rui LI1, a * and Chang-hong TANG 2,b 1, Northwestern polytechnical university, Xi’an 710072, China 2, Northwestern polytechnical university, Xi’an 710072, China 1, savastopol@163.com *Corresponding author Keywords: The Reynolds stress, Turbulence, Numerical simulation, The boundary layer.
Introduction With CFD applications in practical engineering design gradually,deepening, the flow field on geometry body becomes more complex.
The main methods on numerical simulation of turbulent flow are the Direct Numerical Simulation, large eddy simulation (LES) and Reynolds Reynolds-averaging equations simulation .The Reynolds equation method is a basic method for the engineering computation of turbulent flow.
One of the future direction of development of turbulence simulation, which is aimed to perfect compressibility correction.
Turbulence modeling for CFD ,California DCW industies inc ,1993

We have used the 2D Finite Element Method for calculating the characteristics of brushless DC (BLDC) motor, computing fluid mechanics (CFD) as numerical analysis for blade design.
We have used the 2D Finite Element Method for calculating the characteristics of brushless DC (BLDC) motor, computing fluid mechanics (CFD) as numerical analysis for blade design.
The blade's performance in design step can achieve computing fluid mechanics (CFD) as numerical analysis.
After the boundary conditions are specified and the solution models are selected, the iterations are performed in SC/Tetra (commercial CFD simulation software).
The fan blade's performance in design step could achieve computing fluid mechanics (CFD) as numerical analysis.

Numerical Simulation of Internal Flow in Stamping and Welding Multistage Centrifugal Pump Yuanyi Liu1,a, Ruiguang Li1,b and Kai Sun1,c 1School of Mechanical Engineering, Shandong University of Technology, Zibo, 255049, China aliuyy@sdut.edu.cn, brg_lxd@yeah.net, cnetforce@163.com Keywords: Stamping and welding multistage centrifugal pump, Numerical simulation, Impeller, FLUENT Abstract.
Based on the Reynolds time-averagedequations and standardtwo-equation turbulent mode, using multiple reference model and wall function method, the inner flow fields were simulated which is a part of three different kinds of impeller on stamping and welding multistage centrifugal pump by CFD software FLUENT.
Based on this situation, numerical simulation is conducted to one components of the multistage pump containing draft-tube, guide vane and impeller.
This paper selects one component of the multistage pump to go on numerical simulation which reveals the flow condition more truly, calculated region is shown in figure 1.
Wang: Computational Fluid Dynamics—CFD principle of software and analysis (Tsinghua University press, China 2004)

Therefore, we planned to design a novel rotor-type micromixer and to explore the mixing flow mechanism with CFD method.
One complete cycle of rotor motion was performed with 1080 time steps and the iteration number for each time step is 200 to ensure the convergence of simulations.
We intended to multiple the original number into two and four times then conducted the CFD runs.
For improvement the simulation efficiency, further CFD runs were conducted with the 2x density grid system which represented the grid number was 10710.
The present work employed CFD model and dynamic mesh technology to test a variety of operating conditions on the mixing efficiency.