The induced transient viscous flow due to a suddenly stretched surface is studied. After a similarity transform, the unsteady Navier--Stokes equation is solved by several methods, including perturbation for small times, numerical integration, and asymptotic analysis for large times. It is found that the validity of the small-time series can be greatly extended and the approach to steady state is exponential.
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Chang et al. (1997) studied this question.
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