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The self-similar decay of energy in a turbulent flow is studied in directnumerical simulations with and without rotation. Two initial conditions areconsidered: one non-helical (mirror-symmetric), and one with maximal helicity.The results show that, while in the absence of rotation the energy in thehelical and non-helical cases decays with the same rate, in rotating flows thehelicity content has a major impact on the decay rate. These differences areassociated with differences in the energy and helicity cascades when rotationis present. Properties of the structures that arise in the flow at late timesin each time are also discussed.

Effect of helicity and rotation on the free decay of turbulent flows