20
1. Basic Concepts of Fluid Flow
by examples. Adaptive grid methods and local grid refinement are the subject
of another section. Finally, parallelization is discussed. Special attention is
paid to parallel processing for implicit methods based on domain decomposition in space and time, and to analysis of the efficiency of parallel processing.
Example calculations are used to demonstrate these points.
Finally, in Chap. 12 some special issues are considered. These include the
treatment of moving boundaries which require moving grids and flows with
free surfaces. Special effects in flows with heat and mass transfer, two phases
and chemical reactions are briefly discussed.
We end this introductory chapter with a short note. Computational fluid
dynamics (CFD) may be regarded as a sub-field of either fluid dynamics or
numerical analysis. Competence in CFD requires that the practitioner has a
fairly solid background in both areas. Poor results have been produced by
individuals who are experts in one area but regarded the other as unnecessary. We hope the reader will take note of this and acquire the necessary
background.