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Why it is not converge in DPM calculation?

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Old   April 17, 2006, 14:20
Default Why it is not converge in DPM calculation?
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I calculate DPM with 1000 particles from a nozzle, The continuity vibtrates betwen 10-2 and 10-3. Why it is not converge/ Thanks for any suggestions.

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Old   April 18, 2006, 05:48
Default Re: Why it is not converge in DPM calculation?
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you can try it with lower under-relaxation factors of Discrete Phase Sources
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Old   April 18, 2006, 22:58
Default Re: Why it is not converge in DPM calculation?
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I've had some difficulty getting DPM models to converge with some recent simulations. Here are a few tips to improve stability:

- solve for strictly turbulent flow first (disable Energy, PDF and radiation model [if applicable]). Once turbulent solution is converged, enable these equations. - solve for uncoupled DPM first - once uncoupled flow reaches convergence (or close to), enable interaction with continuous phase. Use an URF of about 0.1. - increase # of continuous phase iterations per DPM iterations (try 100) - increase # of tries, if DRW model is enabled
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