81 Mapping A Computational Flow Model On A Computer

The overall process of any computational flow-modeling project was discussed in Section 1.2 (see Fig. 1.11 for key steps). It will be instructive to re-examine such a process with the background of Chapters 2 to 7. The first step of any flow-modeling project is to identify key controlling processes and relate these controlling processes to underlying fluid dynamics. This analysis will allow one to formulate clear objectives for the flow-modeling exercise. It must be mentioned here that, usually, the potential

Objectives of flow modeling

Development of modeling approach

Define objectives of the flow model Space and time scale analysis of problem under consideration Evaluate possible simplifications (physical/geometrical) Devise an approach to achieve model objectives within the resource constraints

4 Identify key fluid dynamic issues 4 Develop model equations/boundary conditions

Geometry modeling and grid generation

Finalize solution domain and boundary conditions Geometry modeling: CAD files/build from scratch Examine resolution requirements/grid spacing & distribution

Formulate grid sequencing/refining strategies

Numerical solution of model equations

Specification of required system data and boundary conditions Selection of appropriate numerical method: discretization scheme, algorithm, solution of algebraic equations Specification of suitable numerical parameters: under-relaxation parameters, time steps, internal iterations, convergence criterion

4 Generate data files containing solution of model equations

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