Large Eddy Simulations LES

We have performed LES simulations periodically fully developed flow in stationary and rotating channels for a range of parameters. We present below just some illustrative results, and details of the work can be found in Saha and Acharya (2002).

The contours of streamwise vortcity Wx) for the two different cases (stationary and rotating)have been presented in Figure 4. Comparison of the two figures clearly reveals that the stationary case has elongated streamwise vortical structures with almost equal activity near top and bottom walls. On the other hand, the rotational case shows smaller structures that are predominantly present near the bottom wall (leading or stable side), and more elongated structures present near the top wall (trailing or unstable side). The greater stretching of the structures near the trailing surface are due to the higher momentum of the fluid near the unstable

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