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

Basic Question on Convergence

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 1, 2002, 17:55
Default Basic Question on Convergence
  #1
Anshul
Guest
 
Posts: n/a
Hello

I am studying chaotic mixing in microchannels. My model is 200 microns wide, 100 microns high, and 1500 microns long. My velocity is 2 cm/s.

I used a hexahedral submap mesh with a spacing of 5 microns to give me 256000 cells.

I am looking at just velocity fields, and then applying a UDS species.

I want to converge my flow to a level that is appropriate. How do I determine this? My residual plots keep decreasing. Are they supposed to level out? I've done 700 iterations and it gets to 1e-8 and is still decreasing. Do I need more iterations? What timestep should I be using? How do I input that?

thanks very much. I am new.

anshul
  Reply With Quote

Old   August 2, 2002, 02:14
Default Re: Basic Question on Convergence
  #2
Christian
Guest
 
Posts: n/a
Hi. You can create a surface plot where you can monitor values of say temperature in a point or a surface. That might help you to determine if your case has converged.

Cheers Christian
  Reply With Quote

Reply

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
basic question: Specifying Pressure for comressible solvers nileshjrane OpenFOAM Running, Solving & CFD 2 October 14, 2010 10:16
Basic question - Geometry Aquatic FLOW-3D 1 August 10, 2010 16:28
Basic question to buoyantBoussinesqPisoFoam kriz OpenFOAM 2 June 12, 2010 03:35
Basic question forsumit OpenFOAM 0 April 7, 2010 10:46
A Basic Question on ducted Flows! CFD User Main CFD Forum 4 January 8, 2005 07:17


All times are GMT -4. The time now is 09:25.