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The blood flow model used in CFD studies of cerebral aneurysms is a controversial topic.
The governing equations that was used to build the CFD model are the conservation equations for mass and momentum.
The general purpose CFD solver FLUENT by ANSYS was used to perform the numerical analysis presented herein.
Direct simulations of transitional flow in a patient-specific carotid bifurcation with stenosis. 2008.
Takao, H., et al., Analysis of cerebral aneurysms using Computational Fluid Dynamics (CFD).

Introduction With the development of computational fluid dynamics, CFD technology has been widely applied to the design of products, such as fluid machinery, vehicle and aircraft.
Jiang et al also predicted the aerodynamic noise base on CFD simulation and compared the numerical results with the experimental data, which presented the significant impact of the grill on the flowing and noise characteristics of the air conditioner outdoor unit.
Junwei Hu et al [4] analyzed the strength and weakness of two types of grill based on CFD simulation.
Numerically simulating the inner flow field of the air conditioner outdoor unit Numerical simulation.
Fluent is a piece of widely-used commercial CFD software and it is used here to simulate the inner flow field of the air conditioner outdoor unit.

The Research on Post Rolling of Aerodynamic Characteristics Numerical Simulation of Flow Field Qi WANG 1,a, Jun ZHANG 1,a, Ming MING1,a, Xiao-xu CHEN 2,a 1Department of Aviation theory1, Air Force Aviation University, Changchun 130022, China. 2Campaign & Command department, Air Force Aviation University, Changchun 130022, China aYuyangtao312@163.com Keyword: post rolling maneuver, CFD analysis method, aerodynamic characteristics, aerodynamic force, aerodynamic torque variation, the focus position Abstract: In this paper, according on post rolling maneuver and the flow field, we build a CFD analysis method about momentum source model flow field and aerodynamic characteristics.
Numerical Simulation of the Flow Field Time averaged Navier-Stokes equation can reflect the real the fluid mass conservation, momentum conservation and energy conservation, which is a Important method to describe the flow field and to analysis.
Numerical Simulation of Wing Aerodynamic Characteristics According to the post roll maneuver characteristics, based on the finite element method to complete the wing flow field analysis.
Unit energy is like below: (7) Unit dynamic dissipation power: (8) In an aircraft wing model, during its flight envelope typical operating conditions, complete the numerical simulation.
Development of rolling process, numerical simulation of dynamic characteristics of different design parameters influence on the flow field. 2) In order to flow a simple simulation post roll maneuver flow, computational accuracy in the circumstances allow, can try to use the Euler equation instead of solving N-S equations.

These studies have demonstrated the advantages offered by CFD in the design and operation of these types of equipment.
Table 1 summarizes the simulation conditions.
All simulations are performed with the commercial CFD package FLUENT 6.3.2.
A structured grid of 396,551 cells is used for the simulation.
Fletcher, Spray drying of food ingredients and applications of CFD in spray drying, Chem.

The pit membrane worked as porous, the water flow through pit is modeled using CFD（Computational fluid dynamics）approach of low k- ε turbulence.
Viscosity resistance and inter resistance C2 are two important parameters of porous medium for simulation precision, which can be compute by classical Ergun formula
Simulation and Discussion A. simulation of water flow in pit To achieve the pit membrane deflection y, the model was simulated on the assumption that there is no pit membrane deflection in boundary conditions using Fluent6 software.
The curves of simulation pressure drop about z=0 surface along the axis is presented in the figure 3 (right).
“Predictions of a Turbulent Separated Flow Using Commercial CFD Codes,” Transactions of the ASME, Vol.123, 2001, pp.819-827 [8] Maciej Andrzej Zwieniecki and Noel Michele Holbrook.

Numerical Simulation Analysis for Influence of Lateral Inclination Angle on the Yacht Resistance Fei Fu 1,a , Yueqin Liu 1,b, Xinxin Wu 1,c 1 Jiaotong Building ,South China University of Technology , Guangzhou, P.R.China, 510641, a843933833@qq.com,b825040874@qq.com,c690350345@qq.com Key words: check node method; numerical simulation; resistance computing Abstract: The article analyses the yacht navigation attitude in the navigation process based on check node method.
It solves RANS equations in the CFD software—Fluent based on VOF method, combined with RNG k model.
Built the model in Gambit, in the platform of FLUENT software, by solving the RANS equations to make direct numerical simulation calculation.
Conclusion In this paper, check node method combined RNAS equation was carried out on hydrostatic navigation simulation analysis of the yacht.
[3]LIU Zhi-hua, XIONG Ying, ZHANG Yong-kun, Study on separating calculation method for ship model wave resistance based on RANS equation and its availability, Journal of Ship Mechanics, Vol.14 No.11, Nov. 2010 [4] NI Chong-ben , ZHU Ren-chuan , MIAO Guo-ping , FAN She-ming, A method for ship resistance prediction based on CFD computation,CHINESE JOURNAL OF HYDRODYNAMICS, Vol.25 No.5,Sept. 2010

And controller for VIV has also been studied using CFD simulation by some scholars, such as Korpus [7], Turki [8] and Andrew [9].
The diameter of the riser selected in the simulations is 0.508m.
The non-dimensional time step used in the simulation is 0.01, which is sufficiently small for stable time domain simulations.
The Navier-Stokes equations of mass and momentum were solved using version 12.0.16 of the general purpose CFD code FLUENT.
Proceedings of the international conference on CFD in the minerals and process industries (2009).

FEM and CFD softwares nowadays are able to handle complex systems and can calculate with continuously changing parameters, making the usage of CFD software adequate for this problem, similarly to other fields of engineering like modeling of the casting process for the industry [3].
For each unique sample holder geometry a fine mesh was generated using the same software, and the data was imported to the FLUENT CFD simulation system as a grid.
Figure 4 Meshed geometry Figure 5 Initial parameters in cooling agent Parallel simulations The simulations were run on the FLUENT CFD package, GAMBIT was used to provide the geometries and the meshes.
With the fully integrated models the CFD simulations ran for 8 hours on 2 processors to simulate the 4.7 second experiments in microgravity or gravity.
With this numerical value the script chose either the initiation of a new simulation with modified thermal conductivity and ran a FLUENT simulation again or stops the model run and saved all data sets.

In this paper, a three-dimensional model of WCB was established and based on which the flow and temperature fields were studied by computational fluid dynamics (CFD) computations.
Based on the CFD simulations, the geometrical three-dimensional models for WCB of diesel engine exhaust system were established, and four different structural ones (same in shape, but different inside) were analyzed: (a) WCB I-the given structure in Fig.1; (b) WCB II-the one with empty structure; (c) WCB III-the one with straight tubes; (d) WCB IV-the one with truncated tubes.
The irrespective influence of meshes on the simulation results was verified for the four models.
The results of CFD computations show that the difference in average temperature between gas-entry section and gas exhaust section is 48.3K (△T=48.3K).
Conclusions Numerical computations based on CFD codes are applied in this paper on four structural water-collecting boxes (WCBs), and distributions of inner flow and temperature fields are obtained respectively.

Because of the symmetry of the geometry model, only half of a single chamber modeled in ICEM CFD according to the actual size was chosen as the calculation model to carry out the numerical calculation.
ICEM CFD was used to block and mesh the model.
Continuity equation: (1) Momentum conservation equation: (2) Transport equations: (3) (4) In CFD simulation, the perforated plates were modeled as thin porous media of finite thickness with directional permeability over which the pressure change was defined as a combination of viscous loss term and an inertial loss term which is given by [5] (5) Many methods can be used to derive viscous and inertial loss coefficients.
Results and Analysis Two simulations were carried out respectively with and without introducing the guide plates.
Wang: CFD Ansysis-Theory and Apply of CFD Software ( Tsinghua University Press, China 2004), p7 (in Chinese) [5] ANSYS Inc.: ANSYS FLUENT 12.0 User’s Guide, 2009