Fluent project

A 2-D CFD model has been set up using FLUENT4.5 in a joint EU JOULE project with FLUENT and ALSTOM. As turbulence models the k- model and Reynolds Stress model (RSM) have been applied. As chemistry models a chemical equilibrium model has been applied and on the other hand two models describing finite reaction chemistry, i.e. the laminar flamelet model and the reaction progress variable model. The comparison between experiments and the numerical results from the three chemistry models show that the chemical equilibrium model is sufficient to predict the combustion of LCV gas at elevated pressures, since deviation from chemical equilibrium is small due to the fast reactions. Hence no improvements are expected and have been observed from kinetically limited models. The RSM with constants Cl and C2 in the pressure-strain term proposed by Gibson and Younis [17] seems to yield the best predictions, however, the influence of the type of turbulence model (RSM or k- e) on the species concentrations and temperature predictions is not very large. 

The use of 3D scanning technology throughout the Sub Vertical Rock winder replacement project proved that if apphed correctly and the information obtained shared on correct forum then it can be used very effectively. The results showed that the benefits was obvious to all and proved enormously useful in making the work on the ACTION day so easy and fluent that the mammoth task became a simple process of following the plan. The visual aid of the 3D scanning process also allowed all persons involved to understand their roles and the overall outcome. 

The temperature and electric potential distributions are obtained by solving the simultaneous differential equations. The contribution of the TE phenomenon was coded in FLUENT and then combined with the conventional codes of FLUENT. The current density was originally evaluated in our project [4] because the optional function in the software did not contain its calculation. 

For the purpose of sizing the 3-D mesh, flow areas and wetted perimeters were extracted and ex-core related boundary conditions (BC) were established at key locations within the reactor this information provided hydraulic diameters. With the projected local velocities and hydraubc diameters, local Reynolds numbers and Mach numbers were calculated that in-tum permitted the mesh to be sized. A 12 million cell (4 million nodes) hybrid N2N mesh was created in ICEM/CFD (V5.1) and written out for use in FLUENT (V6.2.16), a conunercial CFD solver. 

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