There is one class of unsteady turbulent flows, however, that has been studied in fair detail using moderate to highly sophisticated data, reduction techniques.
They performed an extensive set of experiments studying steady and unsteady viscous jet behaviour.
We present a model of sedimentation in a subsiding fluvio-deltaic basin with steady sediment supply and unsteady base level.
Exact analytical representations are obtained describing self-similar unsteady flows of multiphase immiscible fluids in the vicinity of non-circular, but constant strength, fronts.
As another example, consider transport in the vicinity of a single unsteady vortex ring.
The interior unsteady flow shows source-like behaviour at the corners.
The flow within the duct is taken to consist of a steady mean flow with unsteady acoustic perturbations.
The present analyses advance the previous quasi-steady models by being formulated for a fully unsteady flow system, with no time-derivative terms being neglected.
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