## 12.2. Generic Flow Types and Basic Model Selection

There is a wide range of complex industrial turbulent flows and there is no single SRS approach to cover all of them with high efficiency. The most difficult question as you use the software is therefore how to select the optimal model combination for a given simulation. For this task, it is useful to categorize flows into different types. Although such a categorization is not always easy and by no means scientifically exact (there are many flows that do not exactly fall into any one of the proposed categories or fall into more than one) it might still help in the selection of the most appropriate SRS modeling approach.

This section discusses:

- Globally Unstable Flows
- Locally Unstable Flows
- Stable Flows and Wall Boundary Layers

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