unsteady是什么意思

双语用例

• 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.