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-   -   Why it is not converge in DPM calculation? (http://www.cfd-online.com/Forums/fluent/40613-why-not-converge-dpm-calculation.html)

Josh April 17, 2006 14:20

Why it is not converge in DPM calculation?
 
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.

Josh

RAO April 18, 2006 05:48

Re: Why it is not converge in DPM calculation?
 
you can try it with lower under-relaxation factors of Discrete Phase Sources

Markus April 18, 2006 22:58

Re: Why it is not converge in DPM calculation?
 
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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