I have a few doubts regarding viscous flow codes.
Firstly I would like to know how to implement viscous terms in an already existing inviscid code that solves the 2d euler equations using finite volume methods like the rusanov or an upwind method like the Sterger and warming method. Can I just add the viscous terms to the existing flux functions?
Secondly I wanted to know different methods of applying no-slip boundary conditions on the solid walls (with or without ghost cells) .
Any help will be greatly appreciated :)
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