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Old   June 22, 2013, 13:29
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Mikel Mendibe
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If I put 100 rpm rotational velocity to the impeller in the mixing tank it converge, but if I put 500 rpm it does not converge, do anyone knows why??
I put in viscous model k-epsilon RNG, because it is turbulent, I can say if anyone knows all the steps that I have.

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Old   June 23, 2013, 04:27
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At off-design conditions you will have more separation and hence difficulty in converging steady state solution.
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Old   June 23, 2013, 05:19
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So, do you mean that is normal to do not convege?
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Old   June 23, 2013, 06:16
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yes, if it is not a design condition. At off design conditions you may need to activate unsteady flow solver.
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Old   June 23, 2013, 06:32
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Thank you. I have another question, I want that the wall of the tank heat the fuild that I have. I go to the wall and I put the temperature that I want, is it ok?

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Old   June 23, 2013, 06:39
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yes. Also enable energy equation.
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Old   June 25, 2013, 03:22
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You should increase the impeller speed gradually untill to reach your desire speed. For instance, to do a simulation with 400 rpm, first start with 100, then increase it about 20 rpm and go ahead. once I had the same problem too. Try this it helps.
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