CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Duct flow

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

LinkBack Thread Tools Display Modes
Old   December 2, 1999, 21:45
Default Duct flow
Omar Mohamud
Posts: n/a

I am modeling a duct flow with one inlet and four outlets. The duct cross section is non circular and very irregualr. The obejective of the simulation is to predict the mass flow distribution at the outlets for a given mass inlet. The flow is incompressible and turbulent. I am imposing a velocity inlet and a pressure outlet ( outlets were placed 10 diameters downstream to avoid reversed flow).

I was able to obtain a solution where the residuals reduced to 1.e-5 smoothly, but the mass flow rates at the outlets were oscillating. In other words, outlet mass flow rates are a function of iteration. The solution I got shows that there are a lot of secondary flows and a swirl flow at the outlets ( physical outlets). This is somewhat similar to the "swirl back flow" message posted by Jonas Larsson.

I am using Fluent solver and tried different boundary conditions and different turbulent models with no success. Please advice .....


  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
on fully developed duct flow yfyap Main CFD Forum 6 November 7, 2012 10:59
convergent duct water flow kkiitm CFX 0 January 2, 2011 12:11
Duct Flow Analysis benbru CD-adapco 1 September 26, 2007 15:53
Turbulence flow in a rectangular duct Watchapon Main CFD Forum 0 April 7, 2007 07:34
Question about flow in ducted fan in another duct Jane FLUENT 0 June 21, 2004 13:57

All times are GMT -4. The time now is 17:27.