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Commercial CFD code of Ansys Fluent 14 was used.
Simulations were carried out with time step of 5e-4s.
The simulation parameters used for the CFD simulation of the 2D fluidized bed are shown in Table 1.
Parameters used for simulation Results and Discussions Validation of the Model.
To validate whether the CFD results are self-governing from the mesh size, the simulations were performed using 3 type of mesh are coarse (55 x 448), medium (78 x 626) and fine (98 x 783) grids.

The results showed that macro-mixing scale-up model agreed well with CFD simulations but the micro-mixing scale-up model had a less precision compared with that of macro-mixing model.
All the simulations in this work used same boundary conditions.
The details of cases and the length needed to reach 98% mixing both gotten from the scale-up equations and from the CFD simulations were demonstrated in table 1.
Table 1 Comparison of CFD Simulation and Scale-up Equation results under different conditions Cases index d/D uj/um Macro-mixing Micro-mixing L/d (CFD) L/d (Eq） relative deviation（%） L/d (CFD) L/d (Eq) relative deviation (%) 1 1/6 2 74 81.66 9.38 66 88.59 25.50 2 1.5/6 3 39 39.087 0.22 35.33 34.72 -1.76 3 2/6 4 22 23.175 5.07 16 17.87 10.46 4 2.5/6 5 15 15.45 2.91 10.52 8.33 -26.30 5 3/6 6 12.37 11.09 -11.54 9.12 7 -30.29 Conclusions In this paper we investigated the micro- and macro-mixing in the mixing section of ejectors.
The results showed that macro-mixing scale-up model agreed well with CFD simulations but the micro-mixing scale-up model had a less precision compared with that of macro-mixing model.

In recent years, the rapid development of commercial CFD software and is widely used in various fields, this paper CFD software is used to simulate the nozzle flow channel, analyze the distribution of pressure field and the flow field inside the nozzle, which provides related gist and technical means to optimize the nozzle structure parameters.
With the development of computer hardware and turbulence theory, there are many problems in CFD research introduces large-eddy simulation to conduct advanced turbulent numerical simulation.
Simulation Results and analysis.
Numerical simulation analysis inside the nozzle gas flow field is implemented by using CFD software, which obtains the distribution of total pressure, velocity and dynamic and static pressure inside the nozzle gas flow field, and that shows in Figure 3.
Summary The numerical simulation for air-assisted spray nozzle inside flow channel by using CFD software can visually understand and grasp the distribution of the gas flow field inside the nozzle, which can provide a reference for the design of three-dimensional flow calculation, and the simulation calculation can provides a new technical tool to optimize structure of the nozzle and the whole atomization equipment.

The paper presents the numerical prediction of sediment erosion on Francis turbine blades using CFD code.
The numerical simulation results are consistent with the real situation. 1.
OpenFOAM is an object-oriented C++ library of classes and routines of use for writing CFD codes.
The numerical simulation results are consistent with the real situation.
Numerical simulation of turbidity current flow and sedimentation: I.

The method that combined the reverse engineering based on CT medical images and computational fluid dynamics(CFD) was used to perform simulation the Non-Newtonian blood fluid flow in human abdominal artery, then analyzed the hemodynamic condition about the bifurcation of human abdominal artery.
In this article, computational fluid dynamics(CFD) and computed tomography(CT) image were used to study blood flow in the human abdominal artery.
Reconstruction of the 3D model for numerical simulation in the software ANSYS-ICEM.
The data for were derived for each time step in the simulation by the software of ANSYS-CFX.
Schonfeld, Integral boundary conditions for unsteady biomedical CFD applications , J.

To model the particle motion in a computational fluid dynamics (CFD) simulation of the semi-solid forming process of this type of materials, a Lagrangian multiphase approach combining CFD and discrete element method (DEM) was used.
The simulations were performed for a symmetric disc geometry.
In the end, the study shows that by using four-way CFD-DEM coupling, simulation predictability for the semi-solid forming process of AMC could be significantly improved.
This equals particles ten times smaller than in the simulations.
As a result, the EModule was reduced to 100 MPa in the simulations.

Three patches of FVIs with a density of 2.0583/cm2 were considered in the simulations.
By employing advanced modeling and simulation techniques, this research aims to comprehensively investigate the velocity parameter of flow through FVIs using CFD coupled with the Reynolds Stress 7 Equation model. 2.
The schematic diagram of the CFD model is (as shown in Fig. 2 (a, b)).
After the modeling and meshing of the CFD model, FLUENT was utilized for the simulation and post-processing of the numerical investigation.
Schematic diagram of boundary conditions of CFD model 3.

Basic theory of simulation 3.1.
We used CFD software to analyze and simulation flow field due to that conventional formula can’t solve such problem.
We calculate the change of parameters in complex flow fields by means of CFD theory[4].
The process of CFD simulation as follows. (1) Establish geometric model and mesh. (2) Chose solver and material character.
Calculated mass flow rate of inlet channel and outlet channel using CFD simulation.

A lot of three-dimensional numerical simulations are carried out on the new valve, and the numerical simulations give a good linear relationship between relative flow coefficient and relative valve opening.
An experiment setup was established to verify the results of numerical simulations, and the results show that the CFD technology to research and design the new valve plate is entirely feasible.
So it meets our requirements and the contrast diagram of numerical simulation, and experimental research is shown in figure 9.
Guti，Numerical 3D simulation of the erosion due to solid ppaper impact in the main stop valve of a steam turbine, Applied Thermal Engineer 24 (2004) 1877–1891
Wang, Principles and applications of CFD software, third ed, F.J.

The work was done using the commercial computational fluid dynamic (CFD) code FLUENT.
CFD Application The precalciner and operation conditions used in this work are shown in Fig. 1.
Simulation results were obtained using 165,141~235,130 unstructured grids.
The simulation results show that ARS chips should never be injected in higher injection height.
The simulation results show that ARS chips should never be injected in higher injection height.