|January 29, 2012, 08:03||
Join Date: Jan 2012
Posts: 9Rep Power: 5
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.
|Thread||Thread Starter||Forum||Replies||Last Post|
|Boundary Conditions||Thomas P. Abraham||Main CFD Forum||20||July 7, 2013 05:05|
|Setting outlet Pressure boundary condition using CAFFA code||Mukund Pondkule||Main CFD Forum||0||March 16, 2011 04:23|
|Domain Imbalance||HMR||CFX||3||March 6, 2011 21:10|
|How exactly the "pressure outlet" bdry condition compute properties on the boundary?||yating9901||FLUENT||3||June 28, 2010 12:26|
|How to set boundary condition in Fluent for the fo||Peiyong||FLUENT||1||November 10, 2006 12:44|