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Old   July 7, 2010, 12:49
Default Granular Temperature?
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Hi i have a problem with a 3d simulation of an high pressurized bottle (70 bar) discharging a powder into an engine bay (modelled as a big cilynder). The model i use is a Mixture model with Nitrogen Ideal and this powder as 2nd phase (patched at the end of the bottle, near the exit nosel)... the problem is that when i start the simulation i always get high temperatures and the solution diverges immediatly.

I think it is related with the granular temperature of the powder, cause i donīt know what is it and what should be a good value to set...

I think that the mesh is good, it is HEXA with determinants all over 0.3 and angles over 27°...

Thanks in advance
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Old   July 8, 2010, 10:24
Amol Ramteke
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Granular Temperature is not temperature. It is the kinetic energy posses by the particle before collussion
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Old   July 8, 2010, 10:40
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yes i know, but i donīt know what is a good value for my case... i thought that setting a strange value could screw up my simulation and let fluent going nuts (high temp, high viscosity ratios and so on)..

Default value is 0.0001 but i donīt know if it is good or not for my simulation, do you have any experience with granular flow? My particles are really small, something like 5 micrometers...

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