CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

vorticity boundary condition

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   May 14, 2010, 11:32
Default vorticity boundary condition
  #1
New Member
 
Mike Hu
Join Date: May 2010
Posts: 1
Rep Power: 0
bearcharge is on a distinguished road
I'm solving a 2D forced convection problem by using finite difference method. It involves solving the vorticity-stream function equations. I met some problem when I'm trying to solve the vorticity equation, which can be stated as follows:

How to deal with the vorticity boundary condition? after some searching in google, I realized that vorticity boundary condition is actually changing as time goes forward! In other word, vorticity boundary condition has to upgraded at each time step. But since the vorticity boundary condition is not constant, what values should we adopt? Say we're calculating the n+1 step, should we use the vorticity boundary condition at n+1 step or at n step? One other thing, because vorticity boundary condition is actually calculated from stream function distribution, what choice we make about vorticity boundary condition involves the distribution of stream function, at least at the boundary and at the layer that is closest to the boundary(suppose we use Thom method to calculate vorticity boundary condition). In this sense, it seems that we have to use the previous time step stream function values, because solving the vorticity-stream function equation series requires vorticity to be first solved, then the stream function. Does that mean we use the n time step stream function to get the vorticity boundary condition for n+1 time step vorticity calculation?

Thank you for reading my post, any suggestion or advice will be greatly appreciated
bearcharge is offline   Reply With Quote

Reply

Tags
boundary conditions, vorticity

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Boundary Conditions Thomas P. Abraham Main CFD Forum 20 July 7, 2013 05:05
inlet velocity boundary condition murali CFX 5 August 3, 2012 08:56
Transient outlet boundary condition problem jwillie2000 CFX 1 December 7, 2009 17:07
RPM in Wind Turbine Pankaj CFX 9 November 23, 2009 04:05
Help Urgent about changing boundary condition Anjum Naveed FLUENT 7 August 14, 2006 12:25


All times are GMT -4. The time now is 19:49.