![]() An unsteady fluid will generally have a high Reynolds number and be subject to a whole host of changing properties. Unsteady derives from how a fluid will change over time (with all “input” conditions remaining the same). The difference with laminar flows is that they generally move at slower velocities, lower Reynolds numbers, and move slower relative to their viscosities. Laminar flows may be unsteady as well, but they are the only type of fluid flows that can technically considered to be steady. And that is the key to turbulence: it is unsteady because it changes over time.ĭefining something as a “steady” is generally reserved for laminar flows, fluids maintain consistent properties. In definition, turbulence is transient, it changes over time. Turbulence in considered to be fundamentally unsteady.
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