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Restitution coefficient wall

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Old   November 29, 2011, 13:47
Default Restitution coefficient wall
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hello how i specify Restitution coefficient wall ??
thanks
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Old   November 30, 2011, 00:42
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hi. if you working on multiphase flow using Eulerian model you proceed like this:

define -> phases, select secondary phase, set and set Granular Temperature Model to Partial Differential Equation

now you can set coefficient of restitution under Boundary Conditions, wall (for second phase) under multiphase.

(source:How to define particle-wall restitution coefficient in Eulerian multiphase model ?)
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Old   November 30, 2011, 15:18
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thank u!!!!
but now how can i define the granular temp?
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Old   December 1, 2011, 20:36
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hi. do you mean the value of granular temperature?
you can take the default value 0.0001 .
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Old   December 2, 2011, 03:07
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yea, but i have a value and i dont see were to put it...
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Old   December 2, 2011, 05:29
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hi.
like this : boundary condition -->inlet-->secondary phase--> momentum
you find granular temperature=0.0001
boundary condition -->outlet-->secondary phase-->multiphase
you find back flow granular temperature=0.0001
i hope this will help you.
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Old   December 2, 2011, 09:11
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i will try and let u know

thank u for the help and quick answers.
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Old   December 18, 2011, 12:54
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ok i tried it, but it strange i still cant se the difference.
i use an Eulerian model, and when i try to increased the volume fraction (B.C->velocity inlet-> volume fraction)

to 0.02, and make the initialized i get the next massage (before the running of the calc):
"turbulent viscosity limited to viscosity ratio of 1.00 e+5 in 27915 cells"

what it mean? do E model have a limit of volume fraction?
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