January 2, 2013, 05:25
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k and epsilon were hard to converge in multiphase model of Fluent
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#1
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Member
Yanlong Li
Join Date: Jan 2013
Location: BeiJing
Posts: 47
Rep Power: 13
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Dear All,
![Embarrassment](https://www.cfd-online.com/Forums/images/smilies/redface.gif) 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? ![Confused](https://www.cfd-online.com/Forums/images/smilies/confused.gif) thanks in advance.
Long
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