CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

3D swirl flow in FLUENT

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

LinkBack Thread Tools Search this Thread Display Modes
Old   August 27, 2009, 17:14
Post 3D swirl flow in FLUENT
New Member
Join Date: Aug 2009
Posts: 4
Rep Power: 13
amrit is on a distinguished road
m learning FLUENT now so as to do a project... i have been trying to simulate a swirl flow in a cylindrical pipe ... but the solution is not converging and am facing problems while trying out various things... so could ne1 plz help me out

thnxx in advance!!
amrit is offline   Reply With Quote

Old   September 1, 2009, 09:06
Question plz help me out..
New Member
Join Date: Aug 2009
Posts: 4
Rep Power: 13
amrit is on a distinguished road
plzz guys .. i really need sm help..
amrit is offline   Reply With Quote

Old   September 2, 2009, 23:43
New Member
Sean Delfel
Join Date: Aug 2009
Posts: 27
Rep Power: 13
delfel is on a distinguished road
Hi Amrit,

More details are probably needed to determine why your solution isn't converging. Can you tell us any more about the problem and your model? Also, what is the convergence history like -- do the residuals diverge immediately or after many iterations?

The most common problem for people new to CFD are poor mesh elements or improper boundary conditions. My first tip would be to display contours of your mass residuals and see what the grid looks like in the area with the highest residuals. You should also examine the mesh in Gambit to see what your aspect ratios, skewness, etc. are like and correct any poorly shaped volumes.

If your mesh is good enough, other tips to achieve convergence are to start with better initial conditions (I'm assuming you used the default values). You can also start with the first order solver, then switch to the second order solver once you've achieved a converged 1st order solution. Finally, you could get a converged solution at a low flow velocity/pressure/etc., then slowly increase the velocity to the desired levels.

Hope that helps,
delfel is offline   Reply With Quote

Old   September 18, 2014, 07:52
Default converge problem
New Member
santosh kumar
Join Date: Sep 2013
Posts: 14
Rep Power: 9
santu is on a distinguished road
I am trying similar type problem. my problem is a 3D vertical cylinder tube which have three inlet and one outlet. In the main pipe water is flowing and in the branch pipe air is injecting.I need to study the swirl flow of the air inside the water. My boundary condition are at inlet all three pipes mass inlet and pressure outlet in the outlet. I am using K-omega sst turbulent model for simulating my problem.

Is my boundary condition and model good .

I am unable to get converge my problem. I am doing unsteady simulation. I decrease the URF values.

I have doing hex mesh with quality 0.45 , aspect ratio 21. i think it is good for meshing geometry

Can anybody help me.
santu is offline   Reply With Quote


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
fluent flow problem Tony FLUENT 3 December 4, 2008 09:29
Exaust flow in silencer using fluent ramprakash FLUENT 0 April 2, 2006 10:55
Viscoelastic Flow in Fluent Edward Chan FLUENT 0 December 7, 2001 09:41
swirl (number) in jet flow N.A.Beishuizen Siemens 0 July 6, 2001 08:23
Flow visualization vs. Calculated flow patterns Francisco Saldarriaga Main CFD Forum 1 August 2, 1999 23:18

All times are GMT -4. The time now is 15:38.