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Usually RNG turbulence model was chosen in Fluent simulation.
Equation： (1) Equation： (2) 2 CFD Geometric Modeling and Flow Field Analysis Boundary conditions are classified as inlet boundary and outlet boundary.
The exit velocity from cavitation nozzle is [5]: (4) -actual jet nozzle flow rate，； -nozzle outlet diameter, ； -nozzle jet pressure, MPa； According to the shape of oscillating cavitation nozzle ,hexahedral meshes are used in ICEM CFD simulation.
Table 1 is the simulation results for different cavitation nozzle parameters.
The simulation parameters were kept same except the length of the cylindric section S.

A simulation model of the capillary tube in melt flow indexer was developed to predict the melt flow behavior and properties of the polymer composite using Computational Fluid Dynamics (CFD) simulation.
This research aims to study the melt flow behavior of the PLA composite filament reinforced by iron particles (Fe) at different temperatures (200 °C, 220 °C, and 240 °C) using a melt flow indexer and comparing it with CFD modeling.
Computational Fluid Dynamics (CFD) simulation in COMSOL Multiphysics(R) was used for the simulation with a governing equation of laminar compressible flow in isothermal conditions relating to the MFI tests of the two polymers, as listed in Table 1.
The simulation results are in good agreement with the basic concepts of fluid flow in tubes.
Koç, Fused Filament Fabrication Process: A Review of Numerical Simulation Techniques, Polymers. 13 (2021) 3534

The present research shows that computational fluid dynamic (CFD) can be used to simulate mixing features such as solids off-bottom suspension, solids concentration and particle size distribution and cloud height.
CFD techniques have been used in the recent years to provide detailed information on the fluid characteristics resulting from the effect of the tank and impeller configurations.
Mathematical Modelling In CFD simulation, the governing equations for a multiphase system can be characterized into the Langrangian or Eulerian method.
So preliminary simulation of pure water flow field had been achieved, and then the particles were added to the stirred tank assuming that the particles were uniformly distributed in the tank.
In the absence of experimental data, it is not possible to verify this aspect of the simulation, but the information provides a valuable insight into the three dimensional character of solid-liquid mixing.

Thus, the simulation and verification about movement of bubbles have laid the foundation for the 3D thermal simulation of top-blown bath of Isa furnace.
It is very difficult to simulation.
The CFD simulation experiments are conducted on different input flow rate and depth of the lance showed in table 1 to get the calculating data of flow and temperature distribution.
Simulation Process.
MATUSEWICZ.CFD Modeling of Swirl and Nonswirl Gas Injections into Liquid Baths Using Top Submerged Lances[J].

Based on the provided parameter, hydraulic design of the pump has been done by CFD method.
CFD Results.
The internal flow field in the pump is simulated using CFD method to check the velocity magnitude distribution.
At last, one impeller with coupled diffusers was designed by CFD method.
Flow field simulation results shown that the velocity in the pump was well controlled even at large flow capacity.

Matrix heat exchanger design The records found from this work are used to maximise the geometry of the tube of matrix heat exchanger by computer simulation.
CFD Model.
The optimized design of the matrix heat exchanger is modelled for heat transfer between hot and cold fluid in flow Simulation which is CFD simulation module of solid works 2009.
Figure 5 MHE Vs CFD Analyse -variation of heat transfer rate with respect to mass flow rate From the Figure 5 come to know that experimental data are matching with CFD analysis by little margin variation.
The both CFD analyse and experimental have the upward tendency for heat transfer rate with respect to mass flow rate.

In this research a numerical analysis on a single cylinder engine using computational fluid dynamics (CFD) is presented.
Engine Flow Analysis The major benefit of the successful implementation of engine analytical models is that engine development time and costs would be reduced through their use [2].Many authors use CFD calculation to analyze the flow behavior on internal combustion engine([3], [4], [5], [6] and [7]).References [3] and [4] conducted different analysis for definition of best geometry of intake port using CFD codes.
As for Qi and his associates [4], they have used two different CFD codes to simulate a four valve, single cylinder engine with some modifications on the intake port to understand its effect on fuel vaporization.
For the transient model, the time-step used on simulation was 0.05 CA, which gives a time interval in order to 1x10-5 s.
Fontanesi: Turbulence Modelling in CFD Simulation of ICE Intake Flows: The Discharge Coefficient Prediction, SAE TECHNICAL PAPER SERIES 2002-01-1118 [6] C.D.Rakopoulos, G.M.Kosmadakis and E.G.Pariotis: Investigation of Piston Bowl Geometry and Speed Effects in a Motored HSDI Diesel Engine using a CFD against a Quasi-Dimensional Model, Energy Conversion and Management (2010), vol. 51, pp. 470-484 [7] C.D.Rakopoulos, G.M.Kosmadakis and E.G.Pariotis:Evaluation of a new computational fluid dynamics model for internalcombustion engines using hydrogen under motoring conditions, Energy (2009), vol. 34, pp. 2158-2166 [8] R.F.Huang, C.W.Huang, S.B.Chang, H.S.Yang, T.W.Lin and W.Y.Hsu: Topological Flow Evolutions in Cylinder of a Motored Engine During Intake and Compression Strokes, Journal of Fluid and Structutres (2005), Vol. 20, pp. 105-127 [9] STAR Methodology For Internal Combustion Engine Applications, VERSION 4.20, CD-adapco (2013)

It is accurate to use CFD hydrodynamic model in optimal design, but its efficiency is low.
According to variables design of experiment was arranged, then kriging model was established to by CFD hydrodynamic calculations of two-D hydrofoil.
The result shows that the Kriging model can reflect the identity of the objective, effectively reduce the cost of CFD simulation.
Both of the two turbulence models reaches good simulation of lift, whose error can be confined within 5% when angle changes between 0°~12°.
Then, reasonable experiment design according to variables is arranged, while kriging model is established to obtain hydrodynamic performances of 2D hydrofoil approximately by doing CFD calculations with retrogression treatment.

In this paper, a thermal inkjet printing simulation model is established in the CFD simulation platform, and the influence of inkjet driver parameters and ink physical parameters on the printing process is studied by numerical simulation.
Numerical Simulation Method Simulation Theory.
Simulation Modeling.
Schematic diagram of two-dimensional simulation model Table 1.
Pneumatic droplet ejection process simulation and size uniformity test[J].

A numerical simulation of electric and hydrodynamic field’s distribution in an electrohydrodynamic pump is made, with the mean to simulate and to determine numerically the liquid pressure and velocity.
Latest studies in the field of EHD micropumps [6,7], have proved the utility of simulation the electrohydrodynamic phenomena using specific CFD programs.
To determine the charge density and electric field distribution as well as the flow parameters of velocity, pressure, and mass flow rate inside the EHD pump, a CFD software as Comsol Multiphysics can be use.
The maximum strength of the electric field obtained from simulation is E=7.34·106 V/m, at the high potential electrode tip (at the emitter).
Conclusions Using CFD software for numerical simulation of electrical and hydrodynamic fields distribution in an electrohydrodynamic pump for dielectric liquids is useful for visualize and for a better understanding of the process.