Residual Jacobian Matrix For Viscous Nodes
 

Hello!
I'm working on a flow solver for NS equations. The LU-SGS method is used.
And I am not sure about how to deal with the residual jacobian for wall nodes.
Because of no-slip and isothermal wall conditions, residual of velocity is 0.
So is it suitable to simply set entries of second and third row of jacobian all 0?