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

difference of the laminar and turbulent model

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   August 14, 2010, 00:40
Default difference of the laminar and turbulent model
  #1
New Member
 
Eric
Join Date: Apr 2009
Posts: 23
Rep Power: 16
duaiduaihu is on a distinguished road
The problem has bothered me grearly that the results using laminar and turbulent model are so different.

what i am simulating is the motion of the residual water in the oil pipe. the geometry is that the beginning section is the horzontal pipe about 1m, the next section is the upward inclined pipe with the angle of 30degree and 3m long. the following is the sketch:

.................... .......outlet
................ . .......
................. ...
............ . ....
inlet
the initialization is patched with water in the lower part of the horizontal pipe, the inlet is velocity lnlet,and the outlet is the pressure outlet. VOF
menthod is used to model the two phase flow. surface tension and wall adhension are considered.

when the laminar is selected, the phase distribution is similar to the experiment, the interface is wavy. but when k-e model is selected. the water gathers together just likes a huge water droplet,(just like the water in the lotus leaf),what is more ,the interface is very smooth, no matter how large the inlet velocity is .

can any friends give me suggesions. what is the problem with the turbulent model .
duaiduaihu is offline   Reply With Quote

Reply

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
CFX Treatment of Laminar and Turbulent Flows Jade M CFX 18 September 15, 2022 08:08
Laminar doesn't converge; Turbulent models do? Amit FLUENT 11 April 23, 2015 23:55
Using a turbulent model when the flow is entirely laminar. mwhyte FLUENT 1 June 7, 2012 11:35
Half laminar and turbulent model trying to solve Andrew Clarke FLUENT 5 May 19, 2008 14:40
how to model transition laminar to turbulent? james Main CFD Forum 0 October 1, 2003 04:16


All times are GMT -4. The time now is 04:52.