Search results

., University Politehnica of Bucharest, Faculty of Aerospace Engineering, 1-7 Polizu Street, 011061, Bucharest 1, Romania acicangrig@yahoo.com, bcrunti_dani@hotmail.com Keywords: numerical simulation, CFD, Gambit, noise control, chevron, acoustic intensity level.
Based on the gas dynamic and geometrical parameters of a single flow jet engine one does a model of CFD data processing.
Present study includes also a case study with a reaction nozzle that has in use the triangular chevrons and reveals the effects on the noise pollution and the propulsion force using CFD .
Computational results The numerical simulations were performed with commercial CFD code Ansys Fluent [6], and the results obtained are presented as follows: Fig. 6 Velocity distribution along Ox axis for the nozzle with 6 chevrons Fig. 7 Radial velocity distribution for different sections of the computational domain Fig. 8 Acoustic intensity level distribution for the nozzle without chevrons Fig. 9 Acoustic intensity level distribution for the nozzle with 6 chevrons Fig. 10 Acoustic intensity level distribution depending on the number of chevrons Fig. 11 Exit nozzle velocity distribution depending on the number of chevrons Fig. 12 Acoustic intensity level distribution depending on the dip angle Conclusions As a result of the numerical simulations one concludes that the triangular chevron helps to reduce with some dB the acoustic intensity level, results that are similar to those obtained in some experimental papers[7,8].

This article will use acoustic FEM and CFD simulation method to analyze the performance of the two kinds of muffler.
Acoustic Simulation Calculation Acoustic finite element model.
Simulation Calculation and Analysis of Results.
CFD Simulation and Analysis Modeling and Meshing.
Simulation Calculation and Analysis.

Numerical Simulation of Salt Particle - Supercritical Water Flow in a 90° Bend Pipe Yuzhen Wang1, a, Shuzhong Wang1, b, Yang Guo1, Donghai Xu1, Guangxin Yu2, Hang Yu2 and Jinpeng Sheng2 1Xi’an Jiaotong University, Suzhou Academy, Suzhou, Jiangsu, 215123, China 2CNOOC New Energy Investment Co., Ltd., Beijing, 100016, China awangyuzhen224@yahoo.com.cn, bs_z_wang@yahoo.cn Keywords: Numerical simulation, supercritical water, salt Abstract.
Simulation object and grid generation.
The present simulation results support that impinging velocity and particle number density are important parameters for particle–wall erosion prediction.
Conclusions DEM method coupled with computational fluid dynamics (CFD) was used to to describe the transport behavior of salt particle–supercritical water flow in a 90° bend pipe.
Yu, Numerical simulation of complex particle–fluid flows, Powder Technol. 179 (2008) 104-114.

Then the Centrifugal pump Hybrid Grid model was built with muti-block structure and octree style.The final structure parameters were obtained by CFD numerical simulation optimization.
The CFD model and grid model is shown in fig.4.
Fig.4 CFD model (left) and Hybrid Grid model (right) Performance simulation of the centrifugal pump Performance analysis on design point Get the main geometric parameters of centrifugal pump after several iterations of calculating results.
Considering the characters of this model pump, using the tradition method with empirical coefficients to do the preliminary design, and combining the computing CFD numerical simulation method better to modify the parameters and build the numerical model to optimize the design parameters of the centrifugal pump’s structure so that the design circle can be shortened effectively.
Computer Simulation,2011,28(1):84-87

These examples demonstrate that the easiest and fastest method for verifying the accuracy of the numerical simulations is to compare the simulation results with those obtained from the experiments.
Numerical simulation Model Structure.
Simulation model define.
Figure 5 show the compared results between the experiments and the simulations for the three tire types.
Experiment and Simulation result for numbered A0, A1 and A2.

University of Feres Yahia, Medea, Algeria aboualemlaribi@yahoo.com, blmp2m_cum@yahoo.fr Keywords: Turbulence, CFD, flow meter, flow conditioner, Navier-Stokes, k-ε.
For the simulation, code CFD Fluent was used.
The numerical analysis is conducted by the CFD Fluent code [7].which is based on the resolution of the Navier-Stokes equations with k-ε like turbulence model.
Experimental Facility for the Simulation Our installation, Fig. 1, consists of an inlet pipe length 10D, followed by disturbers 90° double bend, or a valve, or a Tee, Fig. 2.
The effectiveness of CFD code Fluent to predict flow development in different installations is done where good predictions are presented.

Numerical simulation is an effective method for ice shape prediction based on CFD technology, which has been concerned for years in countries like the US, the UK, France and Canada[2~6].
The abovementioned aspects lead to large computational time for ice accretion simulation.
Predictions of a temperature at 257K and 262K are calculated and compared with CFD data.
Bu: Three-Dimensional Numerical Simulation of Ice Accretion at the Engine Inlet.
Habashi: Toward Real-Time Aero-Icing Simulation of Complete Aircraft via FENSAP-ICE.

Assumptions in Computational Fluid Dynamics (CFD) CFD is the art and science of replacing these partial differential equations with their discretized algebraic forms which when solved give a set of numbers for the flow field at discrete points in time and space, as the case may be, within the flow domain.
CFD is one of the emerging fields for research in dust control area, although, application of CFD methods for solving mine ventilation problems.
Hence, the line-curtain simulation conducted in Model was satisfactory.
Table.2 CFD models evaluating leakage paths along the line curtain.
Freitas: Perspective: Selected benchmarks from commercial CFD codes.

The purpose of the paper is to simulate transmission efficiency for different bending radius of aerosol sampling inlet using CFD.
Results from simulations show that the greater transmission efficiency aerosol sampling inlet will be, the larger bending radius is.
The CFD model can effectively simulate the characteristic and loss of aerosol particulate matters through the bending tube.
CFD simulation In terms of aerosol particle trajectories, the maximum width of the shadow zone occurs at about 0.2 fuselage radius and for drop sizes and velocities for which the modified Stokes number S is ~6.
The simulation results showed that the tube size caused different transmission mechanisms.

In this article We analysis the CFD software named OpenFOAM and detailed testing its performance on high-performance computer, and we do analysis the results which provide a valid reference to the engineers. so there will be another choose of CFD software.
Introduction Last year we conducted a survey of small range and found that The most widely use of computer-aided tools CFD production is ansys, Fluent in all colleges and universities, research institutions, enterprises.
This stage Industrial design is very complex，CFD software will always cost so many time in computing.
The feature of OpenFOAM The OpenFOAM[1] is a free, open source CFD software package produced by OpenCFD Ltd.
[3] Tao Wei, Parallel Molecular Dynamics Simulation of Lysozyme Hydration on IBM Blade Center Cluster[J],ICIS,2010.10