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

k and epsilon were hard to converge in multiphase model of Fluent

Register Blogs Community New Posts Updated Threads Search

Like Tree1Likes
  • 1 Post By Yanlong Li

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 2, 2013, 06:25
Question k and epsilon were hard to converge in multiphase model of Fluent
  #1
Member
 
Yanlong Li
Join Date: Jan 2013
Location: BeiJing
Posts: 47
Rep Power: 13
Yanlong Li is on a distinguished road
Dear All,

My simulation is Injecting gas into Ladle from its bottom. and my models were: VOF, k-epsilon. The time step size was 0.0001s, Residuals were all 10-5. At the beginning, about 0~0.1s, They (continuty, x-velociy, y-velociy, z-velocity, k and epsilon ) were easy to converge, but after that the k and epsilon became harder and harder to converge though the others were easy to converge. I refined my mesh, decreased the Under-Reflaxation-Factor, set MultiGrid, but It did not work.
This problem also came out when I use the other multiphase model (Mixture or Eulerian).
Do you have any idea to get through this confusion? thanks in advance.
Long
Chu, Yung-An likes this.
Yanlong Li is offline   Reply With Quote

Reply

Tags
convergence problem, k-epsilon model, multi phase flow


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
SimpleFoam k and epsilon bounded nedved OpenFOAM Running, Solving & CFD 16 March 4, 2017 09:30
k and epsilon were hard to converge in multiphase model Yanlong Li FLOW-3D 0 January 2, 2013 05:09
K - epsilon VS SST turbulence model Maicol Main CFD Forum 0 November 30, 2012 17:25
SimpleFoam k and epsilon bounded nedved OpenFOAM Running, Solving & CFD 1 November 25, 2008 21:21
Advanced Turbulence Modeling in Fluent, Realizable k-epsilon Model Jonas Larsson FLUENT 5 March 13, 2000 04:27


All times are GMT -4. The time now is 17:52.