The UMIST-N Near-Wall Treatment Applied to Periodic Channel Flow

Chapter 6
Conclusions & Suggestions for
Future Work
In the present study, the UMIST-N near-wall subgrid treatment has been
applied to time-variant flow. The cases considered have been periodic and
steady channel flow. Results have been matched to DNS data on driving
pressure gradient and on bulk flow rate. The logarithmic law of the wall, the
k-ε subgrid solution and the low-Reynolds-number k-ε solution were sub-
stantially similar in the steady case, as expected. In the unsteady case, the
subgrid produced results that were much improved over the log law, bear-
ing more similarity to the low-Reynolds-number results. The subgrid and
low-Reynolds-number results were discernibly different, however, and some
of the features to be considered when implementing a subgrid treatment were
highlighted.
The use of the k-ω turbulence model within the UMIST-N subgrid was also
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