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weired behavior in discrete phase

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Old   August 15, 2006, 11:00
Default weired behavior in discrete phase
Arash Kashani
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does anyone really know how discrete phase model works in fluent?

I use discrete phase model in fluent to inject a single droplet and study its breakup, nevertheless I get differenr results for child drop sizes every time I run the same case, total mass of liquid particles are conserved though. Has anybody ever experienced the same thing? I wonder if I have made any mistakes or if this is in the nature of discrete phase modeling.
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Old   August 30, 2006, 07:30
Default Re: weired behavior in discrete phase
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yes i also faced similar problem, descrete phase calculation is based on your conuous phase it is naturally varie with iteration and with run also . but in many cases it is negligible if you take more particles. but in your case you are taking only one particle. hoping for your feed back kiran
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Old   August 30, 2006, 16:12
Default Re: weired behavior in discrete phase
Arash Kashani
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well, I found the answer in the KIVA II manual. Fluent basically ,like Kiva, calculates the Sauter mean diameter D32, and then determines drop sizes randomly from a x-square distribution function. that's why we get different drop sizes per run,nevertheless it seems to be reasonable if large number of drops are injected.
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