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Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical methods and algorithms to solve and analyze problems that involve fluid flows.
Fig.1shows the configuration of the CFD model.
Fig. 1CFD model and mesh Fig. 2 Stream lines of flow direction The simulation results in Fig. 2 show that the velocity flow field was very symmetrical and beautiful.
Velocity distribution will be shown at line 1, line 2, line 3 and line 4 The computational fluid dynamics simulation was run with no-slip conditions at the wall and witha pressure outlet at the orifice.
In the case of 1 m diameter cylindrical vortex basin, computational fluid dynamics (CFD) and experiment using the model indicate that the suitable outlet diameter was in the range of 0.2-0.3 m.

Viteazu Street, Timisoara, Romania a*alexandru.rus@raal.ro, bvlad.martian@raal.ro, cmihai.nagi@upt.ro Keywords: heat exchanger, pressure drop, CFD Abstract.
The numerical investigation is performed using Autodesk's Simulation CFD 2014.
Simulations are then performed over the so obtained model geometry.
Simulations are done for six different water flows, ranging from 102 [l/min] to 350 [l/min].
This can be explained by the simplified geometry used for the simulation model and the use of the resistance material.

Numerical investigation of pneumatic regulating on low-pressure guide vane Yajie Qina School of Jet Propulsion, Beihang University, Beijing 100191, China a569421550@qq.com Keywords: Variable cycle engine, pneumatic regulation, CFD.
A CFD analysis has been carried out to study the impact of jet parameters (jet position, Angle, flow rate and velocity) to the turbine flow.
The numerical analysis was carried out using the ANSYS CFX-12 CFD package.
Fig. 2 Computational grids of the turbine Fig. 3 The jet pipeline location Performance simulation results The jet position.

At last the numerical simulation results are verified by experiment.
Numerical simulation mainly use the software of CFD to simulate the two-dimensional or three-dimensional wake of wind turbine .Some researches using actuator disk method in which the body forces represent the blades of the wind turbine.
Linlin Tian etc. put forward a method of combining the theory of CFD and the actuator disk [4].
Numerical Simulation Numerical simulation mainly aimed at the 100W wind turbine, and had a diameter of 1.07m.
And the numerical simulation results are verified by experiment.

This paper presented simulation analysis of pressure distribution along a mixing blades propeller used in biodiesel reactor tank.
ANSYS FLUENT software was used to run the simulation.
The result obtained from the simulation is agreed well with the published data.
(a) Three bladed mixing propeller (b) Pitch turbine blade (c) Rushton blade Fig. 1: Mixing propeller in biodiesel reactor (a) Three bladed mixing propeller, pitch turbine blade (c) Rushton blade The CAD model was created in Solidwork 2012 and transferred to FLUENT workbench for boundary setup and solving the simulation.
Nienow, The effect of size, location and pumping direction of pitched blade turbine impellers on flow patterns: LDA measurements and CFD predictions, Institution of Chemical Engineers, Trans IChemE, Vol 79, Part A, November 2001

Numerical simulation of unsteady flow and flow-induced sound of an airfoil and a wing/plate junction are performed in the paper by large eddy simulation (LES) and FW-H acoustic analogy.
It shows that the numerical simulation method in the paper is credible.
In addition, CFD is becoming a more reliable prediction tool for unsteady flow field.
Many CFD analysis rely on DES or LES to correctly simulate the unsteady characteristics in turbulent flow and predict the flow induced sound accurately.
The hybrid CFD/acoustic methods or CAA methods are refined for the acoustic field prediction.

Introduction With the development of computer and CFD software,more and more engineering using numerical simulation method to simulate the thermal environment, air distribution characteristics,and indoor pollutants concentration of the building to be built or built,which can optimize the indoor environment, save costs and improve efficiency.In this paper, the similarity theory is applied to numerical simulation, providing ideas for expanding the numerical calculation.Use thermal environment similarity theory and combine the numerical simulation and experimental measurement verification to study model building and its similar zoom models construction.
Numerical simulation of buildings and similar building models Simulation calculation steps of large space air-conditioned buildings building thermal environment model is shown in Figure 1.
simulated conditions, Because the indoor heat is very small (only the test operator), the test conditions of this heat source is not considered in the simulation room.Indoor cooling load derived from main building envelope,in which the roof heat transfer cooling load is maximum.Due to the large space air-conditioned buildings is generally larger roof heat flux, temperature gradient is high, wall function model is visible.Continue to set the operation, three model calculations and experimental test volume in Figure 4.It can be seen from the figure: Fig. 3 First simulation Fig. 4 Second simulation (1) The second simulation model of vertical temperature distribution trend is consistent with the experimental values,The simulation results is significantly better than the first simulations which verify a larger impact on the roof of a large space air-conditioned buildings indoor thermal environment; (2) Compared standard standard k-εmodel and RNG model to realizable
,the first two simulation results is more consistent with the experimental values.
[5] HU Yu.large space building and its similarity to enlarge the building indoor thermal environment simulation analysis [J].

The prediction results from the standard Smagorinsky (LES-SML) and the dynamic structure (LES-DS) based LES turbulence model are mainly compared, while the commercial CFD software package ANSYS-Forte is employed for this purpose.
For literature reviews of numerical simulations, a faster speed of computational power makes the engine simulations with computational fluid dynamics (CFD) more efficient and reliable during the last few years. [5,6].
The commercial CFD software package namely ANSYS Forte [27] is used for this purpose.
The CFD mesh of the present study at time t = 1.5 ms is illustrated in Fig.2.
The commercial CFD software package namely ANSYS Forte was employed for this purpose.

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.

All the simulations are carried out on NACA 0018.The chord length of the aerofoil is taken as 1m.
The goal was to make the boundary layer turbulent, thus pushing the separation point further behind and allowing the airflow to remain adhesive . 4.3 Ansys ICEM CFD ANSYS ICEM CFD meshing software starts with advanced CAD/geometry readers and repair tools to allow the user to quickly progress to a variety of geometry-tolerant meshers and produce high-quality volume or surface meshes with minimal effort (figures- 4&5). 
Simulations are carried out in ANSYS FLUENT. 3D Geometry: In 3D geometry two types of dimples are used in the wing (figures-4&5).
Simulations are carried out in ANSYS FLUENT.Along with two shape of dimples, plain airfoil is also analysed to compare the result with them.
There are several important decisions that has to be made before a numerical simulation could be performed.