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Key findings highlight the significance of small-scale turbulent structures, the competition between Coriolis and viscous forces, and the successful utilization of CFD LES (Large Eddy Simulation) for quantifying and visualizing the viscous sublayer and eddy flow.
RANS and LES are two commonly used approaches in Computational Fluid Dynamics (CFD) to simulate turbulent flows.
Table I: Description of the OPENFOAM simulation.
In CFD, y+ is a dimensionless wall distance parameter that is used to determine the level of resolution required near the walls of a fluid flow simulation.
Figure 2: Comparison of simulation data with Nusselt and Charwat et al.'

Numerical Simulation of Vertical Axis Wind Turbine Blade Airfoil Performance ZHAO Li-Hua1, a, LIU Ming1, b, LV Tie2, c , MEI Xiao-Qun2, d 1School of Mechanical Engineering, Northeast Electric Power University,Jilin 132012,China 2Zhejiang Zhoushan Cengang Wind Power Co.
CFD simulation software has been applied in this paper.
Representative lift-type vertical axis wind turbine airfoil NACA0014, NACA2414, NACA4414, NACA6414, NACA8414 's aerodynamic simulation have been studied.
Through CFD simulation software, based on two-dimensional structure of the grid for five levels of relative thickness of 14%, relative curvature respectively of 0,2%, 4%, 6%, 8% of the airfoil aerodynamic performance is analyzed.
Computational fluid dynamics, CFD analysis software principle and application [M].

Method Validation.The simulation values and experimental values are compared to verify the effectiveness of the CFD calculation method.
The maximum temperature offset is less than 1.7 °C at the simulation time of 30 minutes, and this meets the maximum temperature offset of suggestion [7].
With the result of this calculation, we can know that the simulation of flow field in numerical methods is suitable for this research.
Conclusion From the above study, we can get the following conclusions: (1) In the range of allowable error, it is feasible and effective to use CFD numerical simulation analysis method to have an analysis of transient analysis for thermal comfort prediction in cabin
[8] JONAS JONSSON, Including Solar Load in CFD Analysis of Temperature Distribution in a Car Passenger Compartment, Lulea University of Technology, 2007:128 CIV.

In this paper, numerical simulation method was employed to analyze the hydraulic characteristics in a tangential vortex dropshaft.
As an assistant tool, CFD software (e.g., Fluent, CFX) provides fast, accurate, and flexible fluid flow and thermal simulation tools to help predict flow characteristics, optimize designs, and validate structure behavior before it was built—minimizing reliance on costly physical prototypes.
Easily explore and compare design alternatives and better understand the implications of design choices using the CFD software.
CFD model of these vortex drop shaft was developed on the FLUENT platform.
Project and CFD Vortex Dropshaft Model Description The tangential dropshaft is part of a drainage system.

Simulation results showed that the horizontal arrangement of the heat source in the workshop influenced heavily the air flow and temperature distribution.
Numerical simulation based on computational fluid dynamics (CFD) method provides a powerful tool for natural ventilation design and parameter optimization [1].
Many authors used CFD to study the natural ventilation of different buildings [2-5].
Numerical model and simulation method.
Realizable k−ε turbulent model [8].was selected for the CFD calculation after several trial calculations and comparison to related experimental data.

The distribution law of inner flow was analyzed by using the SIMPLEC algorithm and multiple reference frame (MRF) model provided by CFD software Fluent.
The numerical simulation adopted CFD software Fluent to inner flow in the multistage pump impeller and guide vanes of DG85-80×10 type boiler.
Numerical simulation method Geometry Model and Meshing.
Numerical Simulation and Optimization of the Flow Field of the Multi-stage Centrifugal Pump.
Study on Three-dimensional Numerical Simulation of Turbulent Flow in the Centrifugal Pump with Long and Short Blades.

In this work, CFD simulations of FSP are first carried out to predict microstructural evolution in stirred, transition and heat affected zones of AZ31 Mg alloy sheets.
Numerical Modeling CFD Modeling of FSP.
Results and Discussion FSP Simulation Results.
Superplastic Forming Simulation Results.
CFD simulations coupled with Zener-Holloman relation were used to accurately model friction stir process and predict metallurgical aspects of processed sheets.

Tel: +86 431 85095271 Keywords: Free Piston Engine, Loop-Scavenging, Scavenging Efficiency, CFD Abstract.
CFD Modeling Model Configuration.
All CFD models require initial and boundary conditions.
Blair, Design and Simulation of Two-stroke Engines.
[6] J.Fredriksson, I.Denbratt, “Simulation of a Two-Stroke Free Piston Engine”, SAE paper, 2004-01-1871

Abstract.Using ANSYS-FLOTRAN CFD program, the finite element simulation is conducted by means of a series of procedures, such as three-dimensional model building of airflow level posture sensor, network modifying, loads applying equation solving, the flow field in three-dimensional hermetic chamber of sensitive element of airflow level posture sensor in different acceleration and inclination is Calculated, The numerical results show that for the sensor of airflow level posture sensor, the effect of acceleration and inclination is similar.
The simulation result of three-dimensional modeling is more comprehensive and accurate, which provides more reliable basis for practical research of the airflow level posture sensor.
Solve of finite element method FLOTRAN CFD analysis function of ANSYS software is used for analysis 2d and 3d fluid flow of advanced tools.
(1)Selection of analyzing types: the choice of FLOTRAN CFD analysis capabilities of ANSYS software
[3] Guoqiang.Wang, “Numerical simulation and practice on ANSYS,” [M].

The conclusions will provide the basis and reference for the performance prediction of axial-flow pumps based on CFD.
The numerical simulation and performance prediction of the internal flow of axial-flow pump bases on CFD could reduce or even replace the model test which has a high cost and a long cycle.In recent years, the numerical simulation of the internal flow of axial-flow pumps based on RANS equation has been widely used in flow analysis of axial-flow pump models, optimization of inlet and outlet runners of pump station and so on.
Numerical simulation method Governing Equations.
The second order implicit scheme is adopted for the turbulent simulation.
The calculation results of steady simulation are showed in Table 1.