Search results

Simulation with software is one of the most important research methods.
Simulation based on ANSYS/FLUENT Structure.
Ma et al. [11] set up a 3D mathematical model of H2-air PEMFC and carried out simulations and performance optimization, by comparing the different cross sections and adjusting structure parameters of flow channel, based on computational fluid dynamics (CFD) software Fluent6.3 Gambit2.2.
The continuity, momentum, and energy equations are simultaneously solved by a general CFD code.
Cao: Computer Simulation Vol. 23 (2006), p. 204 (In Chinese) [25] H.S.

Conclusions A CFD computation is speeded up using GPU technology in this paper.
Jahed Djomehri: Hybrid MPI OpenMP Programming of an Overset CFD Solver and Performance Investigations.
American: nVidia, (2012) [5] Zhang B: Parallel Computing Methods for CFD Using a GPU and Implicit Scheme.
[14] Zhang Z S: Large eddy simulation of turbulent flows: Theory and Application.
[18] Li X L: Direct Numerical Simulation of isotropic homogeneous turbulent flow.

Numerical Simulation of Unsteady Aerodynamic Loads over an Aircraft XiaoJun Xiang 1, a, Yu Qian1,b 1 Civil Aviation Flight University of China, Guanghan Sichuan 618307, China axj_xiang@126.com, bqianyucafuc@126.com Keywords: numerical simulation, unsteady flow, hysteresis effect, hysteresis loop Abstract.
CFD solvers have reached a level of robustness and maturity to allow routine use on relatively inexpensive computer clusters.
Model validate ONERA M6 wing is a standard wing for CFD to model validate in inviscid flow[5,6].
Badcock, Computation of Dynamic Derivatives Using CFD.AIAA paper.
AIAA-2010-4817 [2] Yu Qian,JunLi Yang,XiaoJun Xiang.Numerical Simulation of Unsteady Aerodynamic Loads over an Aerofoil in Transonic Flow.

Mixing Enhancement of a Passive Micromixer by Applying Boundary Protrusion Structures Chang-Yu HSIEH a , An-Shik YANG b Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, Taipei 106, Taiwan a t6458051@ntut.edu.tw, basyang@ntut.edu.tw Keywords: Microfluidics, micromixer, CFD simulations Abstract.
Simulation and measured results of the proposed micromixer demonstrated good mixing operations over a wide range of Re values (numerically: 0.1To simulate the inherently peculiar transport phenomenon inside a passive micromixer with geometrically complex design configuration, the commercial computational fluid dynamics (CFD) software ACE+® was used for conducting numerical calculations [5].
[3] Mengeaud V, Josserand J, Girault HH (2002) Mixing Processes in a Zigzag Microchannel: Finite Element Simulations and Optical Study.
[5] ESI US R&D 2004 CFD-ACE(U) ® V2004 User's Manual ESI-CFD Inc., Huntsville, AL.

The results were used to validate the CFD results.
SST turbulence model was used and the simulation type was transient to capture the rotor fluid interaction more accurately.
The torque was calculated at each time-step at given RPM, and once the torque converged, the simulation was interupted and results were computed.
The results shows very good agreement between the experiment and CFD results.
The CFD results is underpredicted by aproximatly 6%, which means actual performance of the turbine will be 6% higher compared to CFD achived.

Research on Francis Turbine Hydraulic Vibration by CFD Jing yang1, a, Lida Zhang1,b and Lei Lu1,c 1School of Energy and Environment, Xihua University, Chengdu, China any.yangjing@163.com, bzlida@126.com,c812810027@qq.com Keywords: water turbine, hydraulic vibration, air compensation, analysis.
The models was built by using UG and analysed by CFD numerical analysis software to simulate the vibration conditions with air-water two-phase flow.
In modeling some simplification is necessary to be made for simulation, because some of the details will affect the accurate simulation results, as shown in Fig. 1.
Fig. 7 Velocity vector(improved) Fig. 8 Turbulent kinetic energy cloud(improved) Conclusion This paper is based on the abnormal vibration of the low head Francis turbine under the head higher than rated was studied as an example by CFD numerical simulation.
[3] Longhan Xie, Xinyu Long, Jiongming Zhang:CFX fluid analysis and Simulation,Electronic industry press,chapter, 8,Beijing 2012,(in Chinese)

Series of numerical simulations were conducted to investigate the effects of backyard depth to the wind environment of the atrium.
A CFD software was adopted to simulate the wind distribution with variant backyard depth.
Figure 1 The traditional Chinese siheyuan buildings layout[1] Simulated buildings layout and model In considering the computational cost and the requirement of modelling accuracy in the CFD simulations, the pseudo steady-state incompressible Reynolds-averaged Navier–Stokes (RANS) approach of the standard two-equation k−ε turbulence model was chosen in this study.
All the simulations were carried out in an isothermal condition and were performed by the commercial CFD code FLUENT 6.3.26.
(a) (b) Figure 2 The traditional Chinese siheyuan buildings used in this study, (a) the perspective view[1], (b) model used in the CFD simulation A series of analysis models with variant backyard depth were created according to the traditional siheyuan layout as showed in the figure 1 and figure 2.

In the analysis by CFD, the mesh size is 2 mm for one piece; the total mesh number is 125000 pieces.
From these simulations, the upper limit speed for flowing without fountain is confirmed.
In this paper, the pressing velocity is designed by the MPC simulation in offline.
Fig. 7: Weight function of qrate Control Input Design and Simulation.
We designed the controlled pressing velocity, by the MPC simulation in offline.

Designing and building the different geometries in the study will be overkill for the company, so we have decided to conduct this study with the help of CFD simulations.
Fig. 1 Cooler Sketch: a) frontal view; b) side view; c) section A-A; d) wavy fin detail In this paper we will focus on determining the influence of the corrugation amplitude (a) of a wavy fin; having dimensions as follows: pitch (p) 10 mm, longitudinal pitch (pl) 10 mm, flow length (l) 85mm and height (h) 7.8 mm defined in Fig. 1, manufactured at RAAL S.A, using numerical methods, with the help of the commercial package Autodesk Simulation CFD 360.
The main advantage of this CFD software is its capability to run the simulations in the cloud with virtually unlimited computational power.
Even if the computational power is virtually unlimited the simulations take time to finish.
Furthermore, to ensure mesh independent results we have run the simulation at increasing mesh sizes with a fixed speed of 8 m/s.

Thereafter, apply each length of the Spoiler to the commercial software called Computational Fluid Dynamic (CFD) by using K-epsilon model.
Materials and Methods In this study, 2 disks of 3.5 inch hard disk drive type are used in the simulation.
Disk Fig.1 Shows side view of simulation model Fig.2 Shows top view of simulation model For the simulations, the workstation Dell T7500 computer with the specifications of 12GB of RAM, an Intel Xeon CPU 2.4 GHz and 280 GB of storage drive is used in this study.
CFD Investigation of Damper Plate Effect on Air Flow in High Speed Rotation Hard Disk Drive by Using K-E with a Partial Model.
A method to reduce calculation time for a study of a damper plate in a high speed hard disk drive simulation.