Hello. I have a question.
I'm reading the paper. This is "Application of a Fractional-step Method to Incompressible Navier-Stokes Equations" of Kim and Moin.
They introduced two Boundary Conditions of U^hat.
One is U^hat=U^n+1. The other is U^hat=U^n+1+dt*G(phi^n).
But, I don't understand the latter case.
Since G(phi^n)*dt=U^oldhat - U^n,
U^hat=U^n+1+dt*G(phi^n)=U^n+1+U^oldhat - U^n.
Thus, U^hat=U^oldhat. Because, U^n+1- U^n=0 on the boundary.
Then, what is U^oldhat?
I can't compute U^oldhat on the boundary.
Please, help me. What's wrong?
ps : 'G' means gradient. 'hat' is about velocity.
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