Exact Solutions of the Navier-Stokes Equations
The task of finding exact solutions of the Navier-Stokes equations is generally extremely difficult. The nonlinearity of these equations forbids the use of the principle of superposition which served so well in the case of inviscid incompressible potential flows. In spite of this, there are some special cases where exact solutions can be given, and this is most often true when the nonlinear inertial terms vanish in a natural way.
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