## 85 Summary

The basic elements involved when using a computational flow model for reactor engineering or any other application, are: (1) geometry modeling and grid generation; (2) specification of system data and selection of mathematical models and boundary conditions; (3) solution of model equations; and (4) analysis and interpretation of simulation results. The tools required to carry out these elements are generally classified into three groups: pre-processors, solvers and post-processors. Some of the leading commercial tools are listed in Table 8.1. Rather than comparing these commercial tools, key issues in evaluating any CFD code are discussed briefly in this chapter (Table 8.2). Some comments on the importance of using an in-house CFD code and resources to construct such an in-house code are also included. In principle, the skilled CFD user can obtain the desired results from any reasonable commercial CFD code by suitably exploiting user-defined routines. It is important to critically examine the capabilities of user-defined routines and constraints imposed on the use of these routines.

Knowledge of underlying physics and its mathematical representation (Chapters 2 to 5), of numerical methods to solve such mathematical representations (Chapters 6 and 7) and of computational tools to implement these numerical methods (this chapter), equip the reader to harness the potential of computational flow modeling for reactor engineering. It is essential to develop an appropriate modeling approach to suit the reactor-engineering objectives at hand. Development of such approaches is discussed in Chapter 9 with the help of practical examples.

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