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,LTD, China albj86868@163.com, b498959126@qq.com, c1020066580@qq.com Keywords: Double-channel with double-suctionpump, Impeller, Volute, Matching Abstract.In order to study the matching optimization of the impeller and volute as well asthe flow characteristics ofdouble-channel with double-suction pump ,this paper based on CFD performance prediction method uses the same impeller to match the volute with different base diameters, guaranteeing the volute inlet width, flow cross-sectional area, and tongue position unchanged .The calculation results show that scheme A with the largest volute base diameter can not only achieve theexcellent energy characteristics and the velocity-pressure uniform distributions, but also the exchange of the fluid energy is more sufficient in the volute.
Because of the above reasons, this paper based on CFD performance prediction method and predecessors' research results, using the same impeller to match different base diameter volutes,study the influence of different base diameter volutes for the internal flow characteristics of the double-channel with double-suction pump.
As can be seen from the Q-H curve, the changingtendency of the simulation and experimental values are basically the same.
In the optimum condition point, the simulation head is 12m, the experimental head is 11.74m.The relative error of the simulation and experimental values is 2.3%.
From the Q-η curve can be seen, the simulation value is slightly higher than the experimental value, which is due to the numerical simulation not considering the pump volume losses and the friction losses between the water and the plate, etc.

Moreover, the drag reduction mechanism of herringbone riblets are also confirmed and exploited by CFD. 1.
Its efficiency of drag reduction and physical mechanism are clarified by tests in water tunnel and CFD analysis, respectively. 2.
Fig.5 shows the result of simulation and experiment, the result of simulation for different surfaces have a match with the experiment result.
Fig.4 Experiment results of drag reduction Fig.5 Effect of yaw angle on drag reduction (a) 0° (b) 30° (c) 60° Fig.6 CFD analysis results for yaw angle 0°, 30° and 60° herringbone riblet Summary.
Kim, Direct numerical simulation of turbulent flow over riblets, Journal of Fluid Mechanics. 255 (1993) 503-539

Oil blocking effects of the new type oil boom are numerical simulated by using the CFD software Fluent.The results show that diversion structure improves the critical failure rate significantly, so do the oil blocking effects.
Besides, numercail experiments are simulated by using of CFD software Fluent.
The numerical simulation method taken in this paper is reasonable, effective and reliable.
[4] Ning Cheng-hao, Numerical Simulation of Boom Failure[D].Beijing: Beijing University of Chemical Technology,2002
Oil Booms in Various Sea States Blocked Oil and Shape Optimization of Numerical Simulation[D].Dalian:Dalian Maritime University,2007

Finally we do simulations in ANSYS.
Second is performance simulation.
The flow field of a new axial piston EHP is studied based on CFD in Ref.[11], including the models of main flow fields of the pump, numerical simulations, the velocity and pressure distribution.
Simulation and Results Simulation Conditions.
Simulations.

The study methods mainly include numerical simulation and experimental study.
Due to the advantages such as fastness, accuracy, low cost and strong operability and so on, the numerical simulation is widely applied.
Simulation object and model establishment Type of transfer stations.
Simulation object.
The physical model is seen in figure 1, and numerical simulation study is conducted on the smoke diffusion rule by adopting CFD simulation software ANSYS CFX11.0 when the fire occurs.

Effect of groove on performance of splicing fiber in air splicer Zhenyu Wu1, a, Fangyuan Tian1,b and Xudong Hu1,c 1 Zhejiang Provincial Key Lab of Modern Textile Machinery, Zhejiang SCI-Tech University, Hang zhou, China azjuwuzhenyu@gmail.com, blaotian0329@163.com, c xdhu@zstu.edu.cn Keywords: splicing; simulation; axial velocity; pressure Abstract.
The result of simulation and experimental shows that: with the increase of inlet pressure, the rotational velocity and axial velocity of air flow also increase for the without groove case.
CFD Model Description Chamber’s Geometry.
The simulation model of chambers is established.
Air Flow in a Pneumatic Splicer by CFD.

For these reasons, the numerical simulation based on the Computational Fluid Dynamics (CFD) is applied widely to investigate the flow character in the precalciner.
In the present work, CFD numerical simulations of three-dimensional turbulent flow in DD-precalciner are studied.
To simulation numerically, using Gambit software (preprocessor of Fluent software) to mesh, as shown in Fig. 3.
Boundary Conditions and Numerical Methods The boundary values in simulation are determined by the thermal data of cement plant with the capacity of the 5000t/d.
Conclusions This paper presented numerical simulation of the two-phase flow in DD precalciner based on Fluent software.

This work aims at simulation of the mixing performance in the novel co-rotating non-twin screw group developed by the authors.
The simulation concerns the incompressible fluid obeying Carreau flow model.
To the best of our knowledge, numerical simulations about such mixing sections are still rare.
Finite element method (FEM) simulations were carried out by the commercially available CFD software Polyflow by Fluent Inc., using a mixed Galerkin formulation of the isothermal governing equations: (1) (2) Whereis the velocity vector, is the stress tensor, p is the pressure.
Time periodicity and geometry of such a group with the speed ratio equal to 2 are described in the simple way to show what goes on during operating. 2D numerical simulation of flow and mixing in such mixing section is carried out adapting the commercial CFD FEM package Polyflow.

Seshadri has applied CFD technique to study the relation of oval shape and press loss in Annubar Flowmeter[2].
There are three kind of flow field numerical simulation method namely direct numerical simulation, Reynolds statistical average model, turbulent large eddy simulation.
The basic simulation method is to carry out the direct numerical simulation to the large eddy and the simulation to the small eddy with the model.
Simulation Model and Boundary Conditions.
The simulation model is shown in Fig. 2.

Numerical simulation is performed for the two-dimensional axisymmetric domain of a single cell.
The simulation results of the transient temperature fields provide useful guidance for the optimized thermal design so as to enhance the energy efficiency of the battery system.
The equations of species transport and heat transfer are solved by a commercial CFD code FLUENT based on a Finite Volume (FV) method.
The coupling of the electrochemical equations to the CFD code is implemented by loading and executing a set of User Defined Functions (UDFs).
(4) The simulation results of the temperature fields are useful for the optimized design of the thermal management system and for enhancing the battery energy efficiency.