ANSYS Fluent code

Various hypotheses can be introduced to lighten the computational effort required. For example, Kolaczkowski et al. (2007) approached the simulation of an isolated spherical pellet using the commercial code ANSYS Fluent, adopting a standard Arrhenius expression for the definition of the heterogeneous reaction... 

In line with the proposed approach, which is outlined in Figure 3.4, a non-reactive CFD simulation is performed first using commercial software (ANSYS Fluent in this case), in which the feed stream consists of an inert gas (e.g., argon and nitrogen) with the same flow rate and temperature of the actual reacting mixture (laminar, stationary, and monocomponent model). In the second phase, the flow field is exported from the commercial code by means of a user-defined function (UDF). In the third and final phase, exported data are introduced into a C-F-F code, which solves the transport equations, taking into account both chemical kinetics and reactor fluid dynamics. 

The in situ technique presented above is an invasive technique, in which the probe inside the channel will influence the velocity and species profiles. To be able to evaluate the measured profiles, CFD simulations were performed (Hettel et al., 2013). The CFD code FLUENT (ANSYS Fluent) was applied for the numerical simulation of the three-dimensional flow field in the monolithic stmcture. Transport processes in the solid stmcture were not included in the computations. 

The CFD simulation of the MREF can be run over by a commercial code, where appropriate user-defined routines need to be added in order to model chemical reactions and permeation mechanism. In this case we have adopted ANSYS Fluent version 6.3.26 (ANSYS Inc., 2010) the setup for the numerical model is 2D axisymmetric calculator, with double precision, pressure-based solver and steady-state condition. 

This is the final step in CFD analysis, and it involves the organisation and interpretation of the predicted flow data and the production of CFD images and animations. Fluent s software includes full post-processing capabilities. FLUENT exports CFD s data to third-party post-processors and visualisation tools such as Ensight, Fieldview and TechPlot as well as to VRML formats. In addition, FLUENT CFD solutions are easily coupled with structural codes such as ABAQUS, MSC and ANSYS, as well as to other engineering process simulation tools. 

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