Fine structure of near wall dissipation

Abstract eng:
Direct numerical simulations of a turbulent channel flow performed in large computational domains up to the Karman number 1100 are analyzed in order to clarify the near wall behaviour of the dissipation. It is shown that the axisymmetric homogeneous distribution predicts well the dissipation in the whole layer, and that the local isotropy is only valid towards the end of the log-layer. The dissipation characteristics conditioned by fixed amplitudes of the velocity fluctuations show that the level-crossings of the wall normal velocity in the spanwise direction contribute most significantly to the dissipation next to the wall.

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