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

First Order Upwind X High-Order Upwind (CUBISTA) Schemes

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 23, 2010, 23:32
Post First Order Upwind X High-Order Upwind (CUBISTA) Schemes
  #1
New Member
 
Vinicius
Join Date: Sep 2010
Posts: 1
Rep Power: 0
buscapeh is on a distinguished road
Hello,

I'm doing a software that evaluates the numerical solution of Navier-Stokes 2D. I'm using Sola Method's and when I was going to compare the First-Order Upwind (FOU) with the CUBISTA (A High-Order Upwind Scheme), used in the non-linear convective terms, some difficulties appeared. In the FOU scheme, the convergence is achieved normally, i. e., the residue go down to 10^-7. However, in the CUBISTA scheme, the numerical solution does not converges: the residue is oscillating (1 ~ 10^-1)! The same happens with the dt (time step), that is oscillating.
When I look in the simulation, everything is normal with the flow and apparently does not exists unstability.
What can it be? It's possible to compare FOU with CUBISTA (or also QUICKEST) using this strategy?
I'm using dt = 0.001, dx (step line-x) = 0.01, dy (step line-y) = 0.01.

Thanks!
buscapeh is offline   Reply With Quote

Reply

Tags
convergence, navier-stokes, residue, sola, upwind

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
High Resolution (CFX) vs 2nd Order Upwind (Fluent) gravis ANSYS 3 March 24, 2011 03:43
High order finite volume schemes DoHander Main CFD Forum 5 January 19, 2010 01:59
CFL condition for higher order schemes Shyam Main CFD Forum 2 February 14, 2008 15:24
Multicomponent fluid Andrea CFX 2 October 11, 2004 06:12
High order compact finite difference schemes Mikhail Main CFD Forum 6 August 5, 2003 11:36


All times are GMT -4. The time now is 05:54.