All natural phenomena are uncertain,even the flow motion is no exception,all of which is derived from the nonlinear that it follows. The sensitive dependence of the solution on the initial boundary value condition when flow is uncertain,and the multiple solutions of the steady flow form the uncertainty of flow motion. Unsteady flow is absolute,and steady flow is relative. The change of water flow initial boundary value condition is inevitable. Measurement error can't be completely eliminated. There is also ...
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