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

Divergence Problems and Errors

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 28, 2014, 05:55
Default Divergence Problems and Errors
  #1
New Member
 
Mark
Join Date: Oct 2013
Location: Brighton
Posts: 13
Rep Power: 13
mm391 is on a distinguished road
Hello,

I have modelled a basic impinging jet with the nozzle diameter 0.016m and at a Reynolds Number of 90,000 and a H/d ratio of 10.

I have had the following message (which I have attached in terms of a screen shot) from Fluent when I try to run it.

My boundary conditions are shown on the other attachment labelled BC's.

My solution setup is:

Density Based
Energy Equation - On
Spalart-Allmaras
Air as Ideal Gas
Operating Conditions = 0 pressure
Pressure-far-field - Gauge pressure 101325Pa at 288K
Velocity-Inlet - X velocity = 82.166m/s, Pressure = 101325Pa, Turbulent Intensity 0.01%, Hydraulic Diameter = 0.016 at 288K
Solution Method is Implicit

Can anyone shed some light on why I am getting the error and divergence message. I am teaching myself this program and am struggling with this bit.

Also would I need to scale the mesh so that I am getting the appropriate readings even though my geometry is exactly the size that it will be in my experiment?

Any help would be hugely appreciated.

Many Thanks

Mark.
Attached Images
File Type: png BC's.png (42.5 KB, 18 views)
File Type: jpg Error.jpg (46.2 KB, 13 views)
mm391 is offline   Reply With Quote

Old   March 1, 2014, 08:56
Default
  #2
Far
Senior Member
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,558
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
may be placing far field at larger distance help you in getting good convergence.
Far is offline   Reply With Quote

Reply


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
[BEGINNER] Problems running tutorials (incompressible) in OF 2.xx Jaro OpenFOAM Running, Solving & CFD 8 March 16, 2016 08:27
Unexpected step-to-step divergence? petr.f. OpenFOAM Running, Solving & CFD 4 September 6, 2013 05:02
Efficient multigrid algorithms for problems with dominant high frequency errors Caluca Main CFD Forum 0 November 29, 2011 06:28
Orifice Plate with a fully developed flow - Problems with convergence jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 06:24
Modeling in micron scale using icoFoam m9819348 OpenFOAM Running, Solving & CFD 7 October 27, 2007 01:36


All times are GMT -4. The time now is 02:55.