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-   -   k and epsilon were hard to converge in multiphase model of Fluent (http://www.cfd-online.com/Forums/ansys/111268-k-epsilon-were-hard-converge-multiphase-model-fluent.html)

Yanlong Li January 2, 2013 06:25

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

:oMy 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: thanks in advance.
Long


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