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Computational fluid dynamic is called CFD simply.
CFD simulation of the desander Basic assumptions The following basic assumptions are made for modeling and making the model more easy to solve
CFD simulation model FLUENT provides three kinds of multiphase flow model ：VOF , Mixture , Eulerian.
CFD simulation of internal flow field of gas - liquid cyclone [ J ] .
Chemical Equipment Technology by numerical simulation , 2005,26 ( 6 ) :17

Boundary Conditions and Constraint Equations for Simulation of Energy Exchange Poruba Zdenek1,a, Szweda Jan2,b and Podesva Jiri3,c 1,2,3Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava – Poruba, Czech Republic azdenek.poruba@vsb.cz, bjan.szweda@vsb.cz, cjiri.podesva@vsb.cz Keywords: Boundary Condition, Constrain Equation, Temperature, Heat Flow, CFD Simulation, Heat Exchanger.
The contribution and presented work deals with the CFD simulation of heating and air conditioning process of a special vehicle.
Introduction The subject of the presented paper is the CFD analysis of the special vehicle for passenger transportation in extreme climatic conditions.
The emphasis is placed on the introduction of possible, acceptable simplifications which make possible the reduction of computational costs and thus acceleration of the CFD simulation.
Figure 4 Temperature distribution – heating Figure 5 Streamlines - heating Figure 6 Temperature distribution–cooling Figure 7 Temperature distribution-cooling Summary The advantages of use of constraint equations and boundary conditions were presented on the problem of CFD simulation of heating and air conditioning of the special vehicle.

Influence for Brake Torque of Hydraulic Retarder with Shape of Circulation Circle Chu Yaxu1,a, Lv Jinhe2,b 1East campus of Beihua University in Jilin city ofJilin province,China 2East campus of Beihua University in Jilin city of Jilin province,China acyx_1964@sina.com,b350573500@qq.com Keywords: CFD; the RNG turbulence; the shape of circulation circle; numerical simulation Abstract.
Based on CFD software platform, numerical simulation of 3-D with the internal characteristic of hydraulic retarder with different shape of circulation circle was simulated, and the RNG turbulence was adopted.
One of the main factors that influent the performance of hydraulic retarder was the shape of circulation circle, high braking torque can be gotten with the proper shape of circulation circle. numerical simulation was simulated with different shape of circulation circle based on the CFD software platform.
setting the calculation target according to the convergent curve is difficult to judge whether it achieve convergence, Because the simulation calculation of hydraulic retarder are unsteady calculation, Because the simulation calculation of hydraulic retarder are unsteady calculation, monitoring the pressure of the oil inlet and rotor torque changes in the view of convergence curve.
[5] He Ren,Yan Jun. 3D Numerical Simulation and Performance Prediction of Hydraulic Retarder[J].Machine Tool & Hydraulics,2009(3):250-253.

Computational fluid dynamics (CFD) is a simulation tools, which use powerful computers and applied mathematics to create model fluid flow situations for the prediction.
The average of velocity at the outlet of holes, were analyzed and compared with results from simulation in each model.
(BIG) and Khon Kaen University, for information and manual of continuous belt air-blast freezers and support software program for simulation (ANSYS 14.0) in this work.
Sun, Computational fluid dynamics (CFD) – an effective and efficient design and analysis tool for the food industry: A review.
[6] Nahor, H.B., et al., CFD model of the airflow, heat and mass transfer in cool stores.

River flow with submerged foliage vegetation in straight and rectangular cross-sectional channel is numerically simulated through a vertical two-dimensional CFD model.
Refined simulation of flow characteristics within and above the vegetation canopy will improve insights into how biological and physical processes combine to yield stable, equilibrated ecosystem and landform.
A k-w model in the commercial CFD package, Ansys-Fluent is selected, with VOF method treating the flow surface.
Simulation for a specified velocity and leaf density (leaf number per stem) is performed.
Simulation at the oncoming velocity 0.1m/s, the leaf density 8/stem is performed.

The preparation of the file with geometry for numeric simulation. 2.
CFD simulation in order to calculate temperature distribution for the steady state, consisted of the following stages: - the import of the created assembly to the ANSYS programme, - the creation of the mesh of finite elements (Fig. 1), which consist of about 108 thousands finite elements, - the use of the Fluent programme to execute the simulation of blade warming during its work, - the mapping of temperatures to inp file. 3.
CMS simulation, which calculates stresses and temperature variation in sudden cooling.
It consisted of the following stages: - the import of the geometrical model of blade together with ceramic covering, - the use of the results from CFD simulation as initial temperatures, - the creation of the mesh of finite elements (Fig. 2).
The problem was solved in two steps by CFD and CSM analysis.

The Main Assumptions of the Numerical Model CFD simulations are widely used to confirm engineer calculation and reduce the costs of the whole process of the design.
For numerical investigation of the analysed structures commercial CFD software ANSYS FLUENT was used, and for a mesh generator - ANSYS ICEM CFD.
The simulations were made by means of MRF model.
The simulations were made mainly as unsteady.
The results of CFD simulations show that the active discs have impact on fluid like in a classical centrifugal pump - increases the moment of momentum.

Based on the analysis, the simulation result is qualitatively discussed referring to the factual conditions of the engine for validating the feasibility of analysis method.
The appropriate relationships of these stresses can be built by turbulent models, such as the standard model, which is widely used in engineering, is adopted in this paper; this model is a semi-empirical model of the two equations of the turbulent kinetic energy and the diffusion rate , the control equations are as follows: （2） where, represents the fluid’s density, represents the fluid’s dynamical viscosity coefficient, represents the turbulent viscosity coefficient, represents the turbulent kinetic energy created by the average velocity grads. 3 Interpolation method of CFD-CSD Because CSD and CFD mesh disaccord, CSD mesh is sparseness then CFD mesh, so you must insert the CSD displacement of mesh node to CFD mesh node to make the data exchange.
Mathematical Simulation.
The MFX-ANSYS/CFX coupling platform is developed by the ANSYS Corporation to realize the coupling calculation between CFD and CSD.
Based on the analysis, the simulation result is qualitatively discussed referring to the factual conditions of the engine for validating the feasibility of analysis method.

Numerical simulation of blade channel vortex in a low head Francis turbine Hongming ZHANG 1, a, Lixiang ZHANG 1,b 1 Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming 650500,P.R.China ahmzhang8888@126.com, bzlxzcc@126.com Keywords: CFD; channel vortex; Francis turbine; OpenFOAM Abstract.
OpenFOAM is an object-oriented C++ library of classes and routines of use for writing CFD codes.
It has a set of basic features similar to any commercial CFD solver, such as turbulence models and discretization schemes.
It is increasingly being used in the numerical simulation of hydraulic machinery.
SIMULATING CAVITATING FLOWS WITH LES IN OPENFOAM, V European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010, J.

In present work CFD simulations are carried out using ANSYS FLUENT software using Volume of Fluids (VOF) method.
The CFD geometry is shown in Fig. 1.
Delgado, CFD simulation of bubble column flows: An explicit algebraic Reynolds stress model approach, International Journal of Multiphase Flow, 66 (2014) 11-25
Joshi, CFD simulations of bubble column reactors: 1D, 2D and 3D approach,Chem.
Tanga, Three-dimensional CFD–VOF–DPM simulations of effects of low-holdup particles on single-nozzle bubbling behavior in gas–liquid–solid systems.