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problem about DPM of a valve inside flowfield

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Old   March 10, 2014, 00:01
Smile problem about DPM of a valve inside flowfield
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I want to calculate the particle trajectory in a valve. I have got the converger result of gas flow field inside. But when I added DPM into it, some error happened. Error: Floating point error: invalid number.
Are there some special issue to be noticed when using DPM? The point Properties: diameter 0.0001m, Temp 500K, velocity 1m/s, total flow rate 0.1kg/s. The max NO. of steps is 1000. Courant number is 0.1. So what's the problem may be?

Thanks a lot
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