[Nek5000-users] simplify viscosity terms

[nek5000-users at lists.mcs.anl.gov]

Hi,I want to reduce navier stokes to something like boundary layer equations.I want to keep all the term (3D), just reduce viscosity term to something line mu*d2u/dy2 
(omitting  other derivatives). Would you help me where to start?
Hamid
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