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2.2 Models for non-reacting pipe, boundary-layer and jet flows

Flows of this kind can often be adequately simulated by zero- equation models, of mixing-length type.

If the region close to the wall is of special interest, low- Reynolds-number modifications such as that of Van Driest are necessary.

Almost all the two-equation models are likely to give substantially the same results; so it is immaterial which is used.

It is worth remarking that STEADY flows of the present kind are often suitable for the parabolic option of PHOENICS, which can provide accurate fine-grid solution for either two or three dimensions.