CFD Online Logo CFD Online URL
Home > Forums > FLUENT

How to converge successfully?

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

LinkBack Thread Tools Display Modes
Old   January 27, 2002, 06:17
Default How to converge successfully?
Posts: n/a
Dear Sir or Madem,

I am very sorry to trouble you .However as a new user of Fluent, I need some help indeed.

Now I am calculating the pusatile flow of blood in the vessels. To check the accuracy of result, first I build a straight cylinder,then give it pusatile inlet velocity and zero outlet pressure. The length of the cylinder is more than 10 times of the dimmeter. I think if the calculation is right, the velocity of the outlet will be equal to the inlet.

Yes,when the velocity is in the increasing state, the outlet velocity can keep up with the inlet velocity very well. However in the decreasing state, the outlet velocity can not keep up with the inlet velocity...

So I try to slove this problem in these days by using different outlet condition(outlet flow ratio equals to 1),increasing the iteration numbers of each time step and changing the relax factors of momentum and pressure. But the result is still bad similarly .

Have you ever happened to this problem before and how do you deal with it?

Sorry to bother you a lot!

And thanks for your help very much!

Best wishes, Zhang Junmei
  Reply With Quote


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
Laminar doesn't converge; Turbulent models do? Amit FLUENT 11 April 23, 2015 22:55
Regarding FoamX running Kindly help out hariya03 OpenFOAM Pre-Processing 0 April 18, 2008 04:26
HELP !In relaxtion factor converge is taken or not MANOJ KUMAR FLUENT 5 September 22, 2005 04:16
Converge problem for multiphase flow Jen FLUENT 2 September 8, 2005 08:47
Converge problem for multiphase flow Jen FLUENT 4 July 20, 2005 16:52

All times are GMT -4. The time now is 22:00.